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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             -----------------------

                                    FORM 10-Q

(Mark One)

|X|   Quarterly Report Pursuant to Section 13 or 15(d) of
      the Securities Exchange Act of 1934

      For the Quarter Ended September 30, 2007

                                       OR

|_|   Transition Report Pursuant To Section 13 or 15(d) Of
      the Securities Exchange Act of 1934

      For the Transition Period from ___________ to ___________

                           Commission File No. 0-23047

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                             SIGA Technologies, Inc.
             (Exact name of registrant as specified in its charter)

    A Delaware Corporation                          IRS Employer No. 13-3864870

               420 Lexington Avenue, Suite 408, New York, NY 10170
                         Telephone Number (212) 672-9100

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes |X| No |_|.

Indicate by check mark whether the registrant is a large  accelerated  filer, an
accelerated  filer, or a  non-accelerated  filer. See definition of "accelerated
filer and large  accelerated  filer" in Rule 12b-2 of the Exchange  Act.  (Check
one):

Large Accelerated Filer |_|   Accelerated Filer |_|   Non-Accelerated Filer |X|.

Indicate by check mark whether the  registrant is a shell company (as defined in
rule 12b-2 of the Exchange Act). Yes |_| No |X|.

As of November 7, 2007 the  registrant  had  33,900,561  shares of common  stock
outstanding.

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SIGA Technologies, Inc. Form 10-Q Table of Contents Page No. PART I FINANCIAL INFORMATION Item 1. Financial Statements ....................................................................... 2 Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations ...... 11 Item 3. Quantitative and Qualitative Disclosure About Market Risk .................................. 18 Item 4. Controls and Procedures .................................................................... 18 PART II OTHER INFORMATION Item 1. Legal Proceedings .......................................................................... 19 Item 1A. Risk Factors ............................................................................... 19 Item 2. Changes in Securities, Use of Proceeds and Issuer Purchases of Equity Securities ........... 19 Item 3. Defaults Upon Senior Securities ............................................................ 19 Item 4. Submission of Matters to a Vote of Security Holders ........................................ 19 Item 5. Other Information .......................................................................... 19 Item 6. Exhibits ................................................................................... 19 SIGNATURES .......................................................................................... 20 1

PART I - FINANCIAL INFORMATION Item 1 - Financial Statements SIGA TECHNOLOGIES, INC. CONSOLIDATED BALANCE SHEETS Unaudited September 30, December 31, 2007 2006 ------------- ------------ ASSETS Current assets Cash and cash equivalents ....................................................... $ 8,065,733 $ 10,639,530 Accounts receivable ............................................................. 1,016,873 617,032 Prepaid expenses ................................................................ 114,707 141,032 ------------ ------------ Total current assets ........................................................... 9,197,313 11,397,594 Property, plant and equipment, net .............................................. 1,283,829 1,320,315 Goodwill ........................................................................ 898,334 898,334 Intangible assets, net .......................................................... 28,918 165,243 Other assets .................................................................... 261,473 246,201 ------------ ------------ Total assets ................................................................... $ 11,669,867 $ 14,027,687 ============ ============ LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities Accounts payable ................................................................ $ 985,733 $ 1,357,906 Accrued expenses and other ...................................................... 685,380 584,504 Notes payable ................................................................... -- 107,520 ------------ ------------ Total current liabilities ...................................................... 1,671,113 2,049,930 Non-current portion of notes payable ............................................... -- 22,809 Common stock warrants .............................................................. 4,705,296 4,673,098 ------------ ------------ Total liabilities .............................................................. 6,376,409 6,745,837 Commitments and contingencies ...................................................... -- -- Stockholders' equity Common stock ($.0001 par value, 100,000,000 shares authorized, 33,778,061 and 32,452,210 issued and outstanding at September 30, 2007 and December 31, 2006, respectively) .......................................... 3,378 3,245 Additional paid-in capital ...................................................... 66,765,924 63,646,224 Accumulated deficit ............................................................. (61,475,844) (56,367,619) ------------ ------------ Total stockholders' equity ..................................................... 5,293,458 7,281,850 ------------ ------------ Total liabilities and stockholders' equity ..................................... $ 11,669,867 $ 14,027,687 ============ ============ The accompanying notes are an integral part of these financial statements. 2

SIGA TECHNOLOGIES, INC. CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) Three Months Ended Nine Months Ended September 30, September 30, 2007 2006 2007 2006 ------------ ------------ ------------ ------------ Revenues Research and development ................................. $ 1,609,123 $ 2,035,668 $ 4,936,258 $ 4,888,987 ------------ ------------ ------------ ------------ Operating expenses Selling, general and administrative ...................... 793,045 802,391 2,811,701 3,237,002 Research and development ................................. 2,342,303 2,156,473 7,193,191 6,245,640 Patent preparation fees .................................. 58,637 36,304 323,433 258,751 ------------ ------------ ------------ ------------ Total operating expenses ................................ 3,193,985 2,995,168 10,328,325 9,741,393 ------------ ------------ ------------ ------------ Operating loss .......................................... (1,584,862) (959,500) (5,392,067) (4,852,406) Increase (decrease) in fair market value of common stock rights and common stock warrants ................... (998,074) 350,790 (32,198) (721,062) Other income (loss), net ................................... 89,640 (48,088) 316,040 (73,941) ------------ ------------ ------------ ------------ Net loss ................................................ $ (2,493,296) $ (656,798) $ (5,108,225) $ (5,647,409) ============ ============ ============ ============ Weighted average shares outstanding: basic and diluted ..... 33,519,119 27,656,368 33,140,524 27,219,221 ============ ============ ============ ============ Net loss per share: basic and diluted ...................... $ (0.07) $ (0.02) $ (0.15) $ (0.21) ============ ============ ============ ============ The accompanying notes are an integral part of these financial statements. 3

SIGA TECHNOLOGIES, INC. CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) Nine Months Ended September 30, 2007 2006 ------------ ----------- Cash flows from operating activities: Net loss ...................................................................... $ (5,108,225) $(5,647,409) Adjustments to reconcile net loss to net cash used in operating activities: Depreciation .................................................................. 785,316 530,855 Amortization of intangible assets ............................................. 136,325 741,264 Increase in fair market value of rights and warrants .......................... 32,198 721,062 Stock based compensation ...................................................... 411,298 340,281 Non-cash consulting expense ................................................... -- 156,470 Changes in assets and liabilities: Accounts receivable ........................................................ (399,841) 770,532 Prepaid expenses ........................................................... 26,325 28,207 Other assets ............................................................... (15,272) (12,075) Accrued interest payable ................................................... -- 97,822 Deferred revenue ........................................................... -- 87,147 Accounts payable and accrued expenses ...................................... (271,297) (687,432) ------------ ----------- Net cash used in operating activities ...................................... (4,403,173) (2,873,276) ------------ ----------- Cash flows from investing activities: Capital expenditures .......................................................... (748,830) (805,375) ------------ ----------- Net cash used in investing activities ...................................... (748,830) (805,375) ------------ ----------- Cash flows from financing activities: Proceeds from issuance of notes payable ....................................... -- 3,000,000 Net proceeds from exercise of common stock rights ............................. -- 1,534,500 Net proceeds from exercise of warrants and options ............................ 2,708,535 101,985 Repayment of notes payable .................................................... (130,329) (80,639) ------------ ----------- Net cash provided by financing activities .................................. 2,578,206 4,555,846 ------------ ----------- Net (decrease) increase in cash and cash equivalents .......................... (2,573,797) 877,195 Cash and cash equivalents at beginning of period .............................. 10,639,530 1,772,489 ------------ ----------- Cash and cash equivalents at end of period .................................... $ 8,065,733 $ 2,649,684 ============ =========== The accompanying notes are an integral part of these financial statements. 4

SIGA TECHNOLOGIES, INC. Notes to the September 30, 2007 Consolidated Financial Statements (Unaudited) 1. Basis of Presentation SIGA Technologies, Inc. ("SIGA" or the "Company") is a bio-defense company engaged in the discovery, development and commercialization of products for use in defense against biological warfare agents such as smallpox and Arenaviruses. The Company is also engaged in the discovery and development of other novel anti-infectives, and antibiotics for the prevention and treatment of serious infectious diseases. The Company's anti-viral programs are designed to prevent or limit the replication of viral pathogens. SIGA's anti-infectives programs target the increasingly serious problem of drug resistant bacteria and emerging pathogens. The consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and the rules and regulations of the Securities and Exchange Commission (the "SEC") for quarterly reports on Forms 10-Q and should be read in conjunction with the Company's consolidated audited financial statements and notes thereto for the year ended December 31, 2006, included in the 2006 Form 10-K. All terms used but not defined elsewhere herein have the meaning ascribed to them in the Company's 2006 annual report on Form 10-K filed on March 16, 2007. The year-end consolidated condensed balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results of the interim periods presented have been included. The results of operations for the three and nine months ended September 30, 2007 are not necessarily indicative of the results expected for the full year. The accompanying consolidated financial statements have been prepared on a basis which assumes that the Company will continue as a going concern and which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. The Company has incurred cumulative net losses and expects to incur additional losses to perform further research and development activities. The Company does not have commercial products and has limited capital resources. Management's plans with regard to these matters include continued development of its products as well as seeking additional research support funds and future financial arrangements. Although management will continue to pursue these plans, there is no assurance that the Company will be successful in obtaining sufficient future financing on commercially reasonable terms or that the Company will be able to secure funding from anticipated government contracts and grants. Management believes that existing cash balances combined with anticipated cash flows will be sufficient to support its operations beyond the next twelve months, and will fund the Company's business objectives during that period. 2. Significant Accounting Policies Use of Estimates The consolidated financial statements and related disclosures are prepared in conformity with accounting principles generally accepted in the United States of America. Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and revenue and expenses during the period reported. These estimates include the realization of deferred tax assets, useful lives and impairment of tangible and intangible assets and goodwill, and the value of options and warrants granted or issued by the Company. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the financial statements in the period they are determined to be necessary. Actual results could differ from these estimates. Cash and cash equivalents Cash and cash equivalents consist of short term, highly liquid investments, with original maturities of less than three months when purchased and are stated at cost. Interest is accrued as earned. Property, Plant and Equipment Property, plant and equipment are stated at cost less accumulated depreciation. Depreciation is provided on the straight-line method over the estimated useful lives of the various asset classes. Estimated lives are 5 years for laboratory equipment; 3 years for computer equipment; 7 years for furniture and fixtures; and the life of the lease for leasehold improvements. Maintenance, repairs and minor replacements are charged to expense as incurred. Upon retirement or disposal of assets, the cost and related accumulated depreciation are removed from the Balance Sheet and any gain or loss is reflected in the Statement of Operations. 5

Revenue Recognition The Company recognizes revenue from contract research and development and research payments in accordance with SEC Staff Accounting Bulletin No. 104, Revenue Recognition, ("SAB 104"). In accordance with SAB 104, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, collectibility is reasonably assured, contractual obligations have been satisfied and title and risk of loss have been transferred to the customer. The Company recognizes revenue from non-refundable up-front payments, not tied to achieving a specific performance milestone, over the period which the Company is obligated to perform services or based on the percentage of costs incurred to date, estimated costs to complete and total expected contract revenue. Payments for development activities are recognized as revenue as earned, over the period of effort. Substantive at-risk milestone payments, which are based on achieving a specific performance milestone, are recognized as revenue when the milestone is achieved and the related payment is due, providing there is no future service obligation associated with that milestone. In situations where the Company receives payment in advance of the performance of services, such amounts are deferred and recognized as revenue as the related services are performed. For the nine months ended September 30, 2007 and 2006, revenues from National Institutes of Health ("NIH") contracts and Small Business Innovation Research ("SBIR") grants were 65% and 51%, respectively, of total revenues recognized by the Company. Revenues from contracts with the United States Army and the United States Air Force for the nine months ended September 30, 2007 and 2006 were 35% and 49%, respectively. Accounts Receivable Accounts receivable are recorded net of provisions for doubtful accounts. An allowance for doubtful accounts is based on specific analysis of the receivables. At September 30, 2007 and December 31, 2006, the Company had no allowance for doubtful accounts. Research and development Research and development expenses include costs directly attributable to the conduct of research and development programs, including employee related costs, materials, supplies, depreciation on and maintenance of research equipment, the cost of services provided by outside contractors, and facility costs, such as rent, utilities, and general support services. All costs associated with research and development are expensed as incurred. Costs related to the acquisition of technology rights, for which development work is still in process, and that have no alternative future uses, are expensed as incurred. Goodwill Goodwill is recorded when the purchase price paid for an acquisition exceeds the estimated fair value of the net identified tangible and intangible assets acquired. The Company evaluates goodwill for impairment annually, in the fourth quarter of each year. In addition, the Company would test goodwill for recoverability between annual evaluations whenever events or changes in circumstances indicate that the carrying amounts may not be recoverable. Examples of such events could include a significant adverse change in legal matters, liquidity or in the business climate, an adverse action or assessment by a regulator or government organization, loss of key personnel, or new circumstances that would cause an expectation that it is more likely than not that we would sell or otherwise dispose of a reporting unit. Goodwill impairment is determined using a two-step approach in accordance with Statement of Financial Accounting Standards No. 142 "Goodwill and Other Intangible Assets" ("SFAS 142"). The impairment review process compares the fair value of the reporting unit in which goodwill resides to its carrying value. In 2006, the Company operated as one business and one reporting unit. Therefore, the goodwill impairment analysis was performed on the basis of the Company as a whole using the market capitalization of the Company as an estimate of its fair value. Identified Intangible Assets In accordance with Statement of Financial Accounting Standards No. 144 "Accounting for the Impairment or Disposal of Long-Lived Assets" ("SFAS 144"), the Company performs a review of its identified intangible assets to determine if facts and circumstances exist which indicate that the useful life is shorter than originally estimated or that the carrying amount of assets may not be recoverable. If such facts and circumstances do exist, the Company assesses the recoverability of identified intangible assets by comparing the projected undiscounted net cash flows associated with the related asset or group of assets over their remaining lives against their respective carrying amounts. Impairment, if any, is based on the excess of the carrying amount over the fair value of those assets. Our estimates of projected cash flows are dependent on many factors, including general economic trends, technological developments and projected future contracts and government grants. It is reasonably likely that future cash flows associated with our intangible assets may exceed or fall short of our current projections, in which case a different amount for impairment would result. 6

Income taxes Income taxes are accounted for under the asset and liability method prescribed by Statement of Financial Accounting Standards No. 109, "Accounting for Income Taxes." Deferred income taxes are recorded for temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities. Deferred tax assets and liabilities reflect the tax rates expected to be in effect for the years in which the differences are expected to reverse. A valuation allowance is provided if it is more likely than not that some or the entire deferred tax asset will not be realized. Net income per common share The Company computes, presents and discloses earnings per share in accordance with SFAS 128 "Earnings Per Share" ("EPS") which specifies the computation, presentation and disclosure requirements for earnings per share of entities with publicly held common stock or potential common stock. The statement defines two earnings per share calculations, basic and diluted. The objective of basic EPS is to measure the performance of an entity over the reporting period by dividing income (loss) by the weighted average shares outstanding. The objective of diluted EPS is consistent with that of basic EPS, that is to measure the performance of an entity over the reporting period, while giving effect to all dilutive potential common shares that were outstanding during the period. The calculation of diluted EPS is similar to basic EPS except the denominator is increased for the conversion of potential common shares. The Company incurred losses for the three and nine months ended September 30, 2007 and 2006 and as a result, certain equity instruments are excluded from the calculation of diluted loss per share. At September 30, 2007 and 2006, outstanding options to purchase 8,205,003 and 8,482,227 shares, respectively, of the Company's common stock with exercise prices ranging from $0.94 to $5.50 have been excluded from the computation of diluted loss per share as they are anti-dilutive. At September 30, 2007 and 2006, outstanding warrants to purchase 8,415,865 and 9,985,896, shares, respectively, of the Company's common stock, with exercise prices ranging from $1.18 to $4.99 have been excluded from the computation of diluted loss per share as they are anti-dilutive. At September 30, 2006, 68,038 shares of the Company's Series A convertible preferred stock have been excluded from the computation of diluted loss per share as they were anti-dilutive. These shares were converted into shares of the Company's common stock in 2006. Fair value of financial instruments The carrying value of cash and cash equivalents, accounts payable and accrued expenses approximates fair value due to the relatively short maturity of these instruments. Common stock rights and warrants which are classified as assets or liabilities under the provisions of EITF 00-19, are recorded at their fair market value as of each reporting period. Concentration of credit risk The Company has cash in bank accounts that exceed the Federal Deposit Insurance Corporation insured limits. The Company has not experienced any losses on its cash accounts. No allowance has been provided for potential credit losses because management believes that any such losses would be minimal. Share-based Compensation The Company accounts for its stock-based compensation programs under the provisions of Statement of Financial Accounting Standards No. 123 (revised 2004), "Share-Based Payment" ("SFAS 123(R)"), which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and directors including employee stock options and employee stock purchases related to the Employee Stock Purchase Plan ("employee stock purchases") based on estimated fair values. The Company does not have a stock purchase plan at the current time. Segment information The Company is managed and operated as one business. The entire business is managed by a single management team that reports to the chief executive officer. The Company does not operate separate lines of business or separate business entities with respect to any of its product candidates. Accordingly, the Company does not prepare discrete financial information with respect to separate product areas or by location and only has one reportable segment as defined by SFAS No. 131, "Disclosures about Segments of an Enterprise and Related Information". Recent accounting pronouncements Effective January 1, 2007, the Company adopted FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes--an Interpretation of FASB Statement 109 ("FIN 48"). FIN 48 prescribes a comprehensive model for the manner in which a company should recognize, measure, present and disclose in its financial statements all material uncertain tax positions that the Company has taken or expects to take on a tax return. 7

As of the date of adoption, there were no tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase or decrease within twelve months from the date of adoption of FIN 48 or from September 30, 2007. As of September 30, 2007, the only tax jurisdiction to which the Company is subject is the United States. Open tax years relate to years in which unused net operating losses were generated. Thus, upon adoption of FIN 48, the Company's open tax years extend back to 1995. In the event that the Company concludes that it is subject to interest and/or penalties arising from uncertain tax positions, the Company will present interest and penalties as a component of income taxes. No amounts of interest or penalties were recognized in the Company's Consolidated Statements of Operations or Consolidated Balance Sheets upon adoption of FIN 48 or as of and for the three months ended September 30, 2007. 3. Intangible Assets Amortization expense recorded for the nine months ended September 30, 2007 and 2006 was as follows: Nine Months Ended September 30, 2007 2006 ---------- ---------- Amortization of acquired grants $ -- $ 654,228 Amortization of customer contract and grants -- 25,070 Amortization of acquired technology 136,325 61,966 ---------- ---------- $ 136,325 $ 741,264 ---------- ---------- 4. Stockholders' Equity At September 30, 2007, the Company's authorized share capital consisted of 110,000,000 shares, of which 100,000,000 are designated common shares and 10,000,000 are designated preferred shares. The Company's Board of Directors is authorized to issue preferred shares in series with rights, privileges and qualifications of each series determined by the Board. 2006 Placement On October 19, 2006, the Company sold 2,000,000 shares of the Company's common stock at $4.54 per share and warrants to purchase 1,000,000 shares of the Company's common stock. The warrants have an initial exercise price of $4.99 per share and may be exercised at any time and from time to time through and including the seventh anniversary of the closing date. As of September 30, 2007, warrants to acquire 1,000,000 shares of common stock were outstanding. The Company accounted for the transaction under the provisions of EITF 00-19 which requires that free standing derivative financial instruments that require net cash settlement be classified as assets or liabilities at the time of the transaction, and recorded at their fair value. EITF 00-19 also requires that any changes in the fair value of the derivative instruments be reported in earnings or loss as long as the derivative contracts are classified as assets or liabilities. At September 30, 2007, the fair market value of the warrants was $2.3 million. The Company applied the Black-Scholes model to calculate the fair values of the respective derivative instruments using the contracted term of the warrants. Management estimates the expected volatility using a combination of the Company's historical volatility and the volatility of a group of comparable companies. SIGA recorded a gain of $73,000 for the decline in the instruments' fair value from December 31, 2006 to September 30, 2007. 2005 Placement In November 2005, the Company sold 2,000,000 shares of the Company's common stock at $1.00 per share and warrants to purchase 1,000,000 shares of the Company's common stock at an initial exercise price of $1.18 per share, at any time and from time to time through and including the seventh anniversary of the closing date. As of September 30, 2007, warrants to acquire 725,000 shares of common stock were outstanding. The Company accounted for the transaction under the provisions of EITF 00-19. At September 30, 2007, the fair market value of the warrants to acquire common stock was $2.4 million. SIGA recorded a loss of $105,000 for the increase in the instruments' fair value from December 31, 2006 to September 30, 2007. 8

5. Related Parties During the nine months ended September 30, 2007, the Company incurred costs of $52,000 related to work performed by TransTech Pharma, Inc., a related party, and its affiliates. There are no outstanding accounts payable to related parties as of September 30, 2007. 6. Stock Compensation Plans In January 1996, the Company implemented its 1996 Incentive and Non-Qualified Stock Option Plan (the "Plan"). The Plan as amended provides for the granting of up to 11,000,000 shares of the Company's common stock to employees, consultants and outside directors of the Company. The exercise period for options granted under the Plan, except those granted to outside directors, is determined by a committee of the Board of Directors. Stock options granted to outside directors pursuant to the Plan must have an exercise price equal to or in excess of the fair market value of the Company's common stock at the date of grant. For the nine months ended September 30, 2007 and 2006, the Company recorded compensation expense of approximately $411,000 and $340,000, respectively, related to employees and directors stock options. The total fair value of options vested during the nine months ended September 30, 2007 and 2006 was $201,000 and $503,000. The total compensation cost not yet recognized related to non-vested awards at September 30, 2007 is $1.2 million. The weighted average period over which total compensation cost is expected to be recognized is 1.9 years. On May 30, 2007, at the Company's 2007 annual shareholders' meeting, the Company awarded its non-employee directors a total of 105,000 fully-vested options, exercisable at $3.73 per share. During the three months ended September 30, 2007, the Company awarded its employees options to acquire 830,000 shares of the Company's common stock at an exercise price of $3.10 per share. Options to purchase 530,000 shares vest pro rata on the first, second and third anniversary of the date of grant, and options to purchase 300,000 shares will vest upon the achievement of certain milestones. 7. Commitments and Contingencies As of September 30, 2007, our purchase obligations are not material. We lease certain facilities and office space under operating leases. On December 31, 2006, minimum future rental commitments under operating leases having non-cancelable lease terms in excess of one year are as follows: Year ended December 31, Lease obligations 2007 $ 144,237 2008 576,948 2009 579,648 2010 466,448 2011 443,748 ------------- Total $ 2,211,029 ============= 9

Other On December 20, 2006, PharmAthene, Inc. ("PharmAthene") filed an action against the Company in the Court of Chancery in the State of Delaware, captioned PharmAthene, Inc. v. SIGA Technologies, Inc., C.A. No. 2627-N. In its Complaint, PharmAthene asks the Court to order the Company to enter into a license agreement with PharmAthene with respect to SIGA-246, as well as issue a declaration that the Company is obliged to execute such a license agreement, and award damages resulting from the Company's supposed breach of that obligation. PharmAthene also alleges that the Company breached an obligation to negotiate such a license agreement in good faith, as well as seeks damages for promissory estoppel and unjust enrichment based on supposed information, capital and assistance that PharmAthene allegedly provided to the Company during the negotiation process. On January 9, 2007, the Company filed a motion to dismiss the Complaint in its entirety for failure to state a claim upon which relief can be granted. Oral argument on the motion to dismiss was held on June 1, 2007 and the parties are awaiting a decision from the Court. On January 19, 2007, PharmAthene served on the Company its first request for production of documents. The Company moved to stay discovery on January 26, 2007 and this motion was granted on March 8, 2007. SIGA believes that the claims are without merit and plans to defend itself vigorously. 10

SIGA TECHNOLOGIES, INC. Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations The following discussion should be read in conjunction with our financial statements and notes to those statements and other financial information appearing elsewhere in this Quarterly Report. In addition to historical information, the following discussion and other parts of this Quarterly Report contain forward-looking information that involves risks and uncertainties. Overview Since our inception in December 1995, SIGA has pursued the research and development of novel products for the prevention and treatment of serious infectious diseases, including products for use in the defense against biological warfare agents such as smallpox and hemorrhagic Fevers. During the third quarter of 2006, we were awarded a 3 year, $16.5 million contract from the NIH and an additional 3 year, $4.8 million SBIR Phase II continuation grant from the NIH. Both awards support the continuing development of our smallpox drug candidate, ST-246. Our efforts to develop ST-246 were also supported by previous SBIR grants from the NIH totaling $5.8 million, a $1.0 million agreement with Saint Louis University, and a $1.6 million contract with the U.S. Army. Our initiative to advance SIGA's Hemorrhagic Fevers programs is supported by a 3 year, $6.0 million SBIR grant from the NIH, received in September 2006 and previous SBIR grants from the NIH totaling $6.3 million. In September 2007, the Company received a two-year SBIR grant for a total of approximately $600,000, supporting the Company's development of ST-246 treatment of smallpox vaccine-related adverse events. Our anti-viral programs are designed to prevent or limit the replication of the viral pathogen. Our anti-infectives programs are aimed at the increasingly serious problem of drug resistance. These programs are designed to block the ability of bacteria to attach to human tissue, the first step in the infection process. In July 2007, we were awarded a two-year SBIR award for a total of $530,000 to support our Strep program. We do not have commercial biomedical products, and we do not expect to have such products for one to three years, if at all. We believe that we will need additional funds to complete the development of our biomedical products. Our plans with regard to these matters include continued development of our products as well as seeking additional research support funds and financial arrangements. Although we continue to pursue these plans, there is no assurance that we will be successful in obtaining future financing on terms acceptable to us. Management believes it has sufficient funds and projected cash flows to support operations beyond the next twelve months. Our biotechnology operations are based in our research facility in Corvallis, Oregon. We continue to seek to fund a major portion of our ongoing antiviral, antibiotic and vaccine programs through a combination of government grants, contracts and strategic alliances. While we have had success in obtaining strategic alliances, contracts and grants, there is no assurance that we will continue to be successful in obtaining funds from these sources. Until additional relationships are established, we expect to continue to incur significant research and development costs as well as costs associated with the manufacturing of product for use in clinical trials and pre-clinical testing. It is expected that general and administrative costs, including patent and regulatory costs, necessary to support clinical trials and research and development will continue to be significant in the future. To date, we have not marketed, or generated revenues from, the commercial sale of any products. Our biopharmaceutical product candidates are not expected to be commercially available for several years, if at all. Accordingly, we expect to incur operating losses for the foreseeable future. There can be no assurance that we will ever achieve profitable operations. Critical Accounting Estimates The methods, estimates and judgments we use in applying our accounting policies have a significant impact on the results we report in our consolidated financial statements, which we discuss under the heading "Results of Operations" following this section of our Management's Discussion and Analysis. Some of our accounting policies require us to make difficult and subjective judgments, often as a result of the need to make estimates of matters that are inherently uncertain. Our most critical accounting estimates include the assessment of recoverability of goodwill, which could impact goodwill impairments, and the assessment of recoverability of long-lived assets, which primarily impacts operating income if impairment exists. Below, we discuss these policies further, as well as the estimates and judgments 11

involved. Other key accounting policies, including revenue recognition, are less subjective and involve a far lower degree of estimation and judgment. Significant Accounting Policies The following is a brief discussion of the more significant accounting policies and methods used by us in the preparation of our consolidated financial statements. Note 2 of the Notes to the Consolidated Financial Statements includes a summary of all of the significant accounting policies. Share-based Compensation The Company accounts for its stock-based compensation programs under the provisions of Statement of Financial Accounting Standards No. 123 (revised 2004), "Share-Based Payment" ("SFAS 123(R)"), which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and directors including employee stock options and employee stock purchases related to the Employee Stock Purchase Plan ("employee stock purchases") based on estimated fair values. SFAS 123(R) requires companies to estimate the fair value of share-based awards on the grant date using an option pricing model. The value of the portion of the award that is ultimately expected to vest is recorded as expense over the requisite periods in the Company's consolidated statement of operations. Fair value of financial instruments The carrying value of cash and cash equivalents, accounts payable and accrued expenses approximates fair value due to the relatively short maturity of these instruments. Common stock rights and warrants which are classified as assets or liabilities under the provisions of EITF 00-19 are recorded at their fair market value as of each reporting period. The Company applies the Black-Scholes pricing model to calculate the fair values of common stock rights and warrants using the contracted term of the instruments and expected volatility that is calculated as a combination of the Company's historical volatility and the volatility of a group of comparable companies. Revenue Recognition The Company recognizes revenue from contract research and development and research progress payments in accordance with SEC Staff Accounting Bulletin No. 104, Revenue Recognition, ("SAB 104"). In accordance with SAB 104, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed and determinable, collectibility is reasonably assured, contractual obligations have been satisfied and title and risk of loss have been transferred to the customer. The Company recognizes revenue from non-refundable up-front payments, not tied to achieving a specific performance milestone, over the period during which the Company is obligated to perform services or based on the percentage of costs incurred to date, estimated costs to complete and total expected contract revenue. Payments for development activities are recognized as revenue is earned, over the period of effort. Substantive at-risk milestone payments, which are based on achieving a specific performance milestone, are recognized as revenue when the milestone is achieved and the related payment is due, providing there is no future service obligation associated with that milestone. In situations where the Company receives payment in advance of the performance of services, such amounts are deferred and recognized as revenue as the related services are performed. Goodwill Goodwill is recorded when the purchase price paid for an acquisition exceeds the estimated fair value of the net identified tangible and intangible assets acquired. The Company evaluates goodwill for impairment annually, in the fourth quarter of each year. In addition, the Company would test goodwill for recoverability between annual evaluations whenever events or changes in circumstances indicate that the carrying amounts may not be recoverable. Examples of such events could include a significant adverse change in legal matters, liquidity or in the business climate, an adverse action or assessment by a regulator or government organization, loss of key personnel, or new circumstances that would cause an expectation that it is more likely than not that we would sell or otherwise dispose of a reporting unit. Goodwill impairment is determined using a two-step approach in accordance with Statement of Financial Accounting Standards No. 142, "Goodwill and Other Intangible Assets" ("SFAS 142"). The impairment review process compares the fair value of the reporting unit in which goodwill resides to its carrying value. In 2006, the Company operated as one business and one reporting unit. Therefore, the goodwill impairment analysis was performed on the basis of the Company as a whole using the market capitalization of the Company as an estimate of its fair value. In the past, our market capitalization has been significantly in excess of the Company's carrying value. It is reasonably likely that the future market capitalization of SIGA may exceed or fall short of our current market capitalization. If future market capitalization falls short of the Company's carrying value, a potential impairment might result. The use of the discounted expected future cash flows to 12

evaluate the fair value of the Company as a whole is reasonably likely to produce different results than the Company's market capitalization. Intangible Assets In accordance with Statement of Financial Accounting Standards No. 144 "Accounting for the Impairment or Disposal of Long-Lived Assets" ("SFAS 144"), the Company performs a review of its identified intangible assets to determine if facts and circumstances exist which indicate that the useful life is shorter than originally estimated or that the carrying amount of assets may not be recoverable. If such facts and circumstances do exist, the Company assesses the recoverability of identified intangible assets by comparing the projected undiscounted net cash flows associated with the related asset or group of assets over their remaining lives against their respective carrying amounts. Impairment, if any, is based on the excess of the carrying amount over the fair value of those assets. Our estimates of projected cash flows are dependent on many factors, including general economic trends, technological developments and projected future contracts and government grants. It is reasonably likely that future cash flows associated with our intangible assets may exceed or fall short of our current projections, in which case a different amount for impairment would result. If our actual cash flows exceed our estimates of future cash flows, any impairment charge would be greater than needed. If our actual cash flows are less than our estimated cash flows, we may need to recognize additional impairment charges in future periods, which would be limited to the carrying amount of the intangible assets. Recent accounting pronouncements Effective January 1, 2007, the Company adopted FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes--an Interpretation of FASB Statement 109 ("FIN 48"). FIN 48 prescribes a comprehensive model for the manner in which a company should recognize, measure, present and disclose in its financial statements all material uncertain tax positions that the Company has taken or expects to take on a tax return. As of the date of adoption, there were no tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase or decrease within twelve months from the date of adoption of FIN 48 or from September 30, 2007. As of September 30, 2007, the only tax jurisdiction to which the Company is subject is the United States. Open tax years relate to years in which unused net operating losses were generated. Thus, upon adoption of FIN 48, the Company's open tax years extend back to 1995. In the event that the Company concludes that it is subject to interest and/or penalties arising from uncertain tax positions, the Company will present interest and penalties as a component of income taxes. No amounts of interest or penalties were recognized in the Company's Consolidated Statements of Operations or Consolidated Balance Sheets upon adoption of FIN 48 or as of and for the three months ended September 30, 2007. Results of Operations Three months ended September 30, 2007 and 2006 Revenues from research and development contracts and grants for the three months ended September 30, 2007 and 2006 were $1.6 million and 2.0 million, respectively. For the three months ended September 30, 2007 and 2006 we recorded $1.1 million and $1.0 million, respectively, from an NIH contract and NIH SBIR grants, supporting two of our lead programs. Revenue recognized from our programs with the USAF was $480,000 and $1.0 million for the three months ended September 30, 2007 and 2006, respectively. Selling, general and administrative expenses ("SG&A") for the three months ended September 30, 2007 and 2006 were approximately $800,000 for the two respective periods. Research and development expenses for the three months ended September 30, 2007 and 2006, were $2,342,000 and $2,156,000 respectively. The increase of $186,000 or 8.6% is due mainly to an increase of $98,000 in employee and related expenses and an increase of $55,000 in stock based compensation. During the three months ended September 30, 2007 and 2006, we spent $605,000 and $442,000, respectively, on the development of our lead drug candidate, ST-246, an orally administered anti-viral drug that targets the smallpox virus. For the three months ended September 30, 2007, we spent $223,000 on internal human resources and $382,000 mainly on clinical testing. For the three months ended September 30, 2006, we spent $176,000 on internal human resources and $266,000 on pre-clinical testing of ST-246. From inception of the ST-246 development program to-date, we expended a total of $8.7 million related to the program, of which $2.2 million and $6.5 million were spent on internal human resources, and clinical and pre-clinical work, respectively. These resources reflect SIGA's research and 13

development expenses directly related to the program. They exclude additional expenditures such as the cost to acquire the program, patent costs, allocation of indirect expenses, and the value of other services received from the NIH and the Department of Defense ("DoD"). R&D expenses of $325,000 and $326,000 during the three months ended September 30, 2007 and 2006, respectively, were used to support the development of ST-294, a drug candidate which has demonstrated significant antiviral activity in cell culture assays against arenavirus pathogens, ST-193, a drug candidate for Lassa fever virus, and other drug candidates for certain hemorrhagic fevers. For the three months ended September 30, 2007, we spent $54,000 on internal human resources and $270,000 mainly on pre-clinical testing. For the three months ended September 30, 2006, we spent $110,000 on internal human resources and $216,000 on pre-clinical testing. From inception of our program to develop ST-294, ST-193 and other drug candidates for hemorrhagic fevers, to-date, we spent a total of $4.1 million related to the program, of which $1.7 million and $2.4 million were expended on internal human resources and pre-clinical work, respectively. These resources reflect SIGA's research and development expenses directly related to the program. They exclude additional expenditures such as the cost to acquire the program, patent costs, allocation of indirect expenses, and the value of other services received from the NIH and the DoD. For the three months ended September 30, 2007, R&D expenses related to our USAF Agreements were $301,000 and $19,000 for internal human resources and external R&D services, respectively. During the same period in 2006, we spent $172,000 and $360,000 on internal human resources and external R&D services, respectively. Costs related to our work on the USAF Agreements from September 2005 to date were $3.1 million, of which we spent $1.6 million and $1.5 million on internal human resources and external R&D services, respectively. These resources reflect SIGA's research and development expenses directly related to this agreement. They exclude additional expenditures such as patent costs and allocation of indirect expenses. Patent preparation expenses for the three months ended September 30, 2007 were $59,000 compared to $36,000 for the three months ended September 30, 2006. We incurred slightly higher costs during the 2007 three months period for work performed in connection with our two lead programs. Changes in the fair value of common stock rights and common stock warrants sold together with common stock in October 2006 and November 2005 are recorded as gains or losses. For the three months ended September 30, 2007, we recorded a loss of $998,000, reflecting an increase in the fair market value of warrants to purchase common stock. For the same period in 2006, we recorded a gain of $351,000 reflecting a decline in the fair market value of rights and warrants to purchase common stock. The warrants and rights to purchase common stock of SIGA were recorded at fair market value and classified as liabilities at the time of the transaction. For the three months ended September 30, 2007 we recorded other income of $90,000 related to interest income on our cash and cash equivalent balances. During the three months ended September 30, 2006, we recorded other expenses of $48,000 primarily reflecting interest expense on notes payable. Nine months ended September 30, 2007 and 2006 Revenues from research and development contracts and grants for the nine months ended September 30, 2007 and 2006 were approximately $4.9 million for each of the respective periods. For the nine months ended September 30, 2007, we recorded $3.2 million from NIH SBIR grants and an agreement with the NIH supporting our lead programs. Revenues from NIH SBIR grants and an agreement with St. Louis University supporting these programs during the same period in 2006 was $2.2 million. Revenue recognized from our programs with the US Army and the USAF was $1.7 million and $2.4 million for the nine months ended September 30, 2007 and 2006, respectively. SG&A expenses for the nine months ended September 30, 2007 and 2006 were $2.8 million and $3.2 million, respectively. Employees' payroll and related expenses for the nine months ended September 30, 2007 increased by $169,000 from the same period in 2006. Higher expenses for the nine months ended September 30, 2006 were mainly due to professional fees incurred in connection with a business transaction and a non-cash consulting charge. During the nine months ended September 30, 2006 we recorded legal, accounting, and consulting expenses of $752,000, $164,000, and $82,000, respectively, for due diligence services, fairness opinion and legal advice related to a potential business transaction. During the nine months ended September 30, 2006, we also recorded $156,000 reflecting a non-cash consulting charge related to issuance of warrants to consultants. Research and development expenses were $7,193,000 and $6,246,000 for the nine months ended September 30, 2007 and 2006, respectively, an increase of $947,000 or 15.2% from the nine months ended September 30, 2006. 14

Expenditures related to clinical and pre-clinical testing of our lead drug candidates increased $820,000 from the nine months ended September 30, 2006. Our payroll expense has increased by $480,000 from the nine months ended September 30, 2006, reflecting the expansion and change in composition of our research and development workforce. In addition, depreciation expense for the nine months ended September 30, 2007 increased $253,000 from the same period in 2006. These increases were partially offset by a decline of $605,000 in amortization expense. During the nine months ended September 30, 2007 and 2006, we spent $2.3 million and $1.6 million, respectively, on the development of ST-246. For the nine months ended September 30, 2007, we spent $711,000 on internal human resources and $1.6 million mainly on clinical testing. For the nine months ended September 30, 2006, we spent $489,000 on internal human resources and $1.1 million on pre-clinical testing of ST-246. From inception of the ST-246 development program to-date, we expended a total of $8.7 million related to the program, of which $2.2 million and $6.5 million were spent on internal human resources, and clinical and pre-clinical work, respectively. These resources reflect SIGA's research and development expenses directly related to the program. They exclude additional expenditures such as the cost to acquire the program, patent costs, allocation of indirect expenses, and the value of other services received from the NIH and the DoD. R&D expenses of $916,000 and $769,000 during the nine months ended September 30, 2007 and 2006, respectively, were used to support the development of ST-294, a drug candidate which has demonstrated significant antiviral activity in cell culture assays against certain arenavirus pathogens, ST-193, a drug candidate for Lassa fever virus, and other drug candidates for hemorrhagic fevers. For the nine months ended September 30, 2007, we spent $175,000 on internal human resources and $741,000 mainly on pre-clinical testing. For the nine months ended September 30, 2006, we spent $456,000 on internal human resources and $313,000 on pre-clinical testing of ST-294. From inception of our program to develop ST-294, ST-193, and other drug candidates for hemorrhagic fevers, to-date, we spent a total of $4.1 million related to the program, of which $1.7 million and $2.3 million were expended on internal human resources and pre-clinical work, respectively. These resources reflect SIGA's research and development expenses directly related to the program. They exclude additional expenditures such as the cost to acquire the program, patent costs, allocation of indirect expenses, and the value of other services received from the NIH and the DoD. For the nine months ended September 30, 2007, R&D expenses related to our USAF Agreements were $818,000 and $346,000 for internal human resources and external R&D services, respectively. During the same period in 2006, we spent $584,000 and $653,000 on internal human resources and external R&D services, respectively. Costs related to our work on the USAF Agreements from September 2005 to date were $3.1 million, of which we spent $1.6 million and $1.5 million on internal human resources and external R&D services, respectively. These resources reflect SIGA's research and development expenses directly related to this agreement. They exclude additional expenditures such as patent costs and allocation of indirect expenses. Our product programs are in the early stage of development. At this stage of development, we cannot make reasonable estimates of the potential cost for most of our programs to be completed or the time it will take to complete the project. Our lead product, ST-246, is an orally administered anti-viral drug that targets the smallpox virus. In December 2005 the FDA accepted our IND application for ST-246 and granted it Fast-Track status. In December 2006, the FDA granted Orphan Drug designation to ST-246, for the prevention as well as the treatment of smallpox. We expect that costs to complete the program will approximate $15 million to $20 million, and that the project could be completed in 24 months to 36 months. There is a high risk of non-completion of any program, including ST-246, because of the lead time to program completion and uncertainty of the costs. Net cash inflows from any products developed from our programs is at least one to three years away. However, we could receive additional grants, contracts or technology licenses in the short-term. The potential cash and timing is not known and we cannot be certain if they will ever occur. The risk of failure to complete any program is high, as each, other than our smallpox program which began 21 days dose-escalating studies in 2007, is in the relatively early stage of development. Products for the biological warfare defense market, such as the ST-246 smallpox anti-viral, could generate revenues in one to three years. We believe the products directed toward this market are on schedule. We expect the future research and development cost of our biological warfare defense programs to increase as the potential products enter animal studies and safety testing, including human safety trials. Funds for future development will be partially paid for by NIH contracts and SBIR grants, additional government funding and from future financing. If we are unable to obtain additional federal grants and contracts or funding in the required amounts, the development timeline for these products would slow or possibly be suspended. Delay or suspension of any of our programs could have an adverse impact on our ability to raise funds in the future, enter into collaborations with corporate partners or obtain additional federal funding from contracts or grants. 15

Patent preparation expenses for the nine months ended September 30, 2007 were $323,000 compared to $259,000 for the nine months ended September 30, 2006. The increase of $64,000 or 25% reflects additional work performed in connection with our two lead programs. Changes in the fair value of common stock rights and common stock warrants sold together with common stock in October 2006 and November 2005 are recorded as gains or losses. For the nine months ended September 30, 2007 and 2006 we recorded a loss of $32,000 and $721,000, respectively, reflecting an increase in the fair market value of warrants to purchase common stock during the respective nine months periods. The warrants and rights to purchase common stock of SIGA were recorded at fair market value and classified as liabilities at the time of the transaction. For the nine months ended September 30, 2007 and 2006 we recorded other income of $316,000 and other loss of $74,000, respectively. Other income reflects interest income on our net cash balance for the nine months. Other loss for the nine months ended September 30, 2006 mainly reflects interest expense on notes payable. Liquidity and Capital Resources On September 30, 2007, we had $8.1 million in cash and cash equivalents. During the nine months ended September 30, 2007, we received net proceeds of $2.7 million from exercises of warrants and options to purchase shares of the Company's Common stock. We believe that our existing cash combined with anticipated cash flows, including receipt of future funding from government contracts and grants will be sufficient to support our operations beyond the next twelve months, and that sufficient cash flows will be available to meet our business objectives during that period. Operating activities Net cash used in operations during the nine months ended September 30, 2007 was $4.4 million compared to $2.9 million in 2006. During the nine months ended September 30, 2007, our account receivable balance increased $400,000, compared with a decline of $771,000 of accounts receivable during the same period in 2006 as a result of collection of accounts receivable that were outstanding at December 31, 2005. We also used additional cash to support clinical and pre-clinical testing of our leading programs and to support the increase in our R&D payroll expenses. Investing activities Capital expenditures during the nine months ended September 30, 2007 and 2006 were $749,000 and $805,000, respectively, and mainly supported the renovation of our office space in Oregon in 2007 and the renovation of our research facility in Oregon during the same period in 2006. Financing activities Cash provided by financing activities during the nine months ended September 30, 2007 was $2.6 million, generated mainly from exercises of options and warrants to purchase common stock. During the nine months ended September 30, 2006, we received $3.0 million under three notes payable that were paid in full in October 2006, and $1.6 million from exercises of warrants, options and rights to purchase common stock. We have incurred cumulative net losses and expect to incur additional losses to perform further research and development activities. We do not have commercial products and have limited capital resources. Our plans with regard to these matters include continued development of our products as well as seeking additional working capital through a combination of collaborative agreements, strategic alliances, research grants, equity and debt financing. Although we continue to pursue these plans, there is no assurance that we will be successful in obtaining future financing on commercially reasonable terms. Our working capital and capital requirements will depend upon numerous factors, including pharmaceutical research and development programs; pre-clinical and clinical testing; timing and cost of obtaining regulatory approvals; levels of resources that we devote to the development of manufacturing and marketing capabilities; technological advances; status of competitors; and our ability to establish collaborative arrangements with other organizations. Off-Balance Sheet Arrangements SIGA does not have any off-balance sheet arrangements. 16

Safe Harbor Statement This report contains certain "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding the efficacy of potential products, the timelines for bringing such products to market and the availability of funding sources for continued development of such products. Forward-looking statements are based on management's estimates, assumptions and projections, and are subject to uncertainties, many of which are beyond the control of SIGA. Actual results may differ materially from those anticipated in any forward-looking statement. Factors that may cause such differences include the risks that (a) potential products that appear promising to SIGA or its collaborators cannot be shown to be efficacious or safe in subsequent pre-clinical or clinical trials, (b) SIGA or its collaborators will not obtain appropriate or necessary governmental approvals to market these or other potential products, (c) SIGA may not be able to obtain anticipated funding for its development projects or other needed funding, (d) SIGA may not be able to secure funding from anticipated government contracts and grants, (e) SIGA may not be able to secure or enforce adequate legal protection, including patent protection, for its products and (f) unanticipated internal control deficiencies or weaknesses or ineffective disclosure controls and procedures. More detailed information about SIGA and risk factors that may affect the realization of forward-looking statements, including the forward-looking statements in this presentation, is set forth in SIGA's filings with the Securities and Exchange Commission, including SIGA's Annual Report on Form 10-K for the fiscal year ended December 31, 2006, and in other documents that SIGA has filed with the Commission. SIGA urges investors and security holders to read those documents free of charge at the Commission's Web site at http://www.sec.gov. Interested parties may also obtain those documents free of charge from SIGA. Forward-looking statements speak only as of the date they are made, and except for our ongoing obligations under the U.S. federal securities laws, we undertake no obligation to publicly update any forward-looking statements whether as a result of new information, future events or otherwise. 17

Item 3. Quantitative and Qualitative Disclosure About Market Risk None Item 4. Controls and Procedures (a) Disclosure Controls and Procedures. The Company's management, with the participation of the Company's Chief Financial Officer, has evaluated the effectiveness of the Company's disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the fiscal period covered by this Quarterly Report on Form 10-Q. Based upon such evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of such period, the Company's disclosure controls and procedures are effective. (b) Internal Control Over Financial Reporting. There have not been any changes in the Company's internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fiscal period covered by this Quarterly Report on Form 10-Q that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting. 18

Part II Other information Item 1. On December 20, 2006, PharmAthene, Inc. ("PharmAthene") filed an action against the Company in the Court of Chancery in the State of Delaware, captioned PharmAthene, Inc. v. SIGA Technologies, Inc., C.A. No. 2627-N. In its Complaint, PharmAthene asks the Court to order the Company to enter into a license agreement with PharmAthene with respect to SIGA-246, as well as issue a declaration that the Company is obliged to execute such a license agreement, and award damages resulting from the Company's supposed breach of that obligation. PharmAthene also alleges that the Company breached an obligation to negotiate such a license agreement in good faith, as well as seeks damages for promissory estoppel and unjust enrichment based on supposed information, capital and assistance that PharmAthene allegedly provided to the Company during the negotiation process. On January 9, 2007, the Company filed a motion to dismiss the Complaint in its entirety for failure to state a claim upon which relief can be granted. Oral argument on the motion to dismiss was held on June 1, 2007 and the parties are awaiting a decision from the Court. On January 19, 2007, PharmAthene served on the Company its first request for production of documents. The Company moved to stay discovery on January 26, 2007 and this motion was granted on March 8, 2007. SIGA believes that the claims are without merit and plans to defend itself vigorously. Item 1A. Risk Factors - There were no material changes to Risk Factors disclosed in SIGA's 2006 Form 10-K. Item 2. Unregistered Sale of Equity Securities and Use of Proceeds - None. Item 3. Defaults upon Senior Securities - None. Item 4. Submission of Matters to a Vote of Security Holders (a) The Company held a special meeting of Stockholders on July 26, 2007. (b) Proxies for the meeting were solicited pursuant to Regulation 14A of the Securities Exchange Act of 1934, as amended. (c) Briefly described below is each matter voted upon at the annual meeting of Stockholders. (1) Approval of an amendment to the certificate of incorporation to increase the authorized common stock by 50,000,000 shares to 100,000,000 shares of common stock. Total common stock voted was 26,752,344 in favor, 1,173,181 against, 157,461 abstained. Item 5. Other Information - None. Item 6. Exhibits * 31.1 Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. * 31.2 Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. * 32.1 Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. * 32.2 Certification of Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. * Filed herein 19

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. SIGA Technologies, Inc. (Registrant) Date: November 13, 2007 By:/s/ Thomas N. Konatich --------------------------- Thomas N. Konatich Chief Financial Officer 20

                                                                    Exhibit 31.1

                            CERTIFICATION PURSUANT TO
                  SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Eric A. Rose, M.D., certify that:

      1.    I  have  reviewed  this  quarterly  report  on  Form  10-Q  of  SIGA
            Technologies, Inc.;

      2.    Based on my  knowledge,  this  report  does not  contain  any untrue
            statement  of a  material  fact  or omit to  state a  material  fact
            necessary to make the statements made, in light of the circumstances
            under which such  statements  were made, not misleading with respect
            to the period covered by this quarterly report;

      3.    Based on my knowledge, the financial statements, and other financial
            information included in this quarterly report, fairly present in all
            material respects the financial condition, results of operations and
            cash flows of the  registrant as of, and for, the periods  presented
            in this report;

      4.    The registrant's  other certifying officer and I are responsible for
            establishing and maintaining  disclosure controls and procedures (as
            defined in  Exchange  Act Rules  13a-15(e)  and  15d-15(e))  for the
            registrant and have:

            (a)   Designed such disclosure  controls and  procedures,  or caused
                  such  disclosure  controls and procedures to be designed under
                  our supervision,  to ensure that material information relating
                  to the registrant, including its consolidated subsidiaries, is
                  made known to us by others within those entities, particularly
                  during  the  period in which  this  quarterly  report is being
                  prepared;

            (b)   Evaluated the  effectiveness  of the  registrant's  disclosure
                  controls  and  procedures  and  presented  in this  report our
                  conclusions about the effectiveness of the disclosure controls
                  and  procedures,  as of the end of the period  covered by this
                  report based on such evaluation; and

            (c)   Disclosed  in  this  report  any  change  in the  registrant's
                  internal control over financial reporting that occurred during
                  the   registrant's   most  recent  fiscal   quarter  that  has
                  materially  affected,  or is  reasonably  likely to materially
                  affect,  the  registrant's  internal  control  over  financial
                  reporting; and

      5.    The  registrant's  other  certifying  officer and I have  disclosed,
            based  on our  most  recent  evaluation  of  internal  control  over
            financial  reporting,  to the  registrant's  auditors  and the audit
            committee of registrant's  board of directors (or persons performing
            the equivalent functions);

            (a)   All significant  deficiencies  and material  weaknesses in the
                  design  or  operation  of  internal   control  over  financial
                  reporting which are reasonably  likely to adversely affect the
                  registrant's ability to record, process,  summarize and report
                  financial information; and

            (b)   Any fraud,  whether or not material,  that involves management
                  or  other  employees  who  have  a  significant  role  in  the
                  registrant's internal control over financial reporting.


Date: November 13, 2007                 By: /s/ Eric A. Rose
                                            -----------------------
                                            Eric A. Rose, M.D.
                                            Chief Executive Officer


                                       21
                                                                    Exhibit 31.2

                            CERTIFICATION PURSUANT TO
                  SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Thomas N. Konatich, certify that:

      1.    I  have  reviewed  this  quarterly  report  on  Form  10-Q  of  SIGA
            Technologies, Inc.;

      2.    Based on my  knowledge,  this  report  does not  contain  any untrue
            statement  of a  material  fact  or omit to  state a  material  fact
            necessary to make the statements made, in light of the circumstances
            under which such  statements  were made, not misleading with respect
            to the period covered by this quarterly report;

      3.    Based on my knowledge, the financial statements, and other financial
            information included in this quarterly report, fairly present in all
            material respects the financial condition, results of operations and
            cash flows of the  registrant as of, and for, the periods  presented
            in this report;

      4.    The registrant's  other certifying officer and I are responsible for
            establishing and maintaining  disclosure controls and procedures (as
            defined in  Exchange  Act Rules  13a-15(e)  and  15d-15(e))  for the
            registrant and have:

            (a)   Designed such disclosure  controls and  procedures,  or caused
                  such  disclosure  controls and procedures to be designed under
                  our supervision,  to ensure that material information relating
                  to the registrant, including its consolidated subsidiaries, is
                  made known to us by others within those entities, particularly
                  during  the  period in which  this  quarterly  report is being
                  prepared;

            (b)   Evaluated the  effectiveness  of the  registrant's  disclosure
                  controls  and  procedures  and  presented  in this  report our
                  conclusions about the effectiveness of the disclosure controls
                  and  procedures,  as of the end of the period  covered by this
                  report based on such evaluation; and

            (c)   Disclosed  in  this  report  any  change  in the  registrant's
                  internal control over financial reporting that occurred during
                  the   registrant's   most  recent  fiscal   quarter  that  has
                  materially  affected,  or is  reasonably  likely to materially
                  affect,  the  registrant's  internal  control  over  financial
                  reporting; and

      5.    The  registrant's  other  certifying  officer and I have  disclosed,
            based  on our  most  recent  evaluation  of  internal  control  over
            financial  reporting,  to the  registrant's  auditors  and the audit
            committee of registrant's  board of directors (or persons performing
            the equivalent functions);

            (a)   All significant  deficiencies  and material  weaknesses in the
                  design  or  operation  of  internal   control  over  financial
                  reporting which are reasonably  likely to adversely affect the
                  registrant's ability to record, process,  summarize and report
                  financial information; and

            (b)   Any fraud,  whether or not material,  that involves management
                  or  other  employees  who  have  a  significant  role  in  the
                  registrant's internal control over financial reporting.


Date: November 13, 2007                         By: /s/ Thomas N. Konatich
                                                    ----------------------
                                                    Thomas N. Konatich
                                                    Chief Financial Officer


                                       22
                                                                    Exhibit 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Quarterly  Report of SIGA  Technologies,  Inc. (the
"Company") on Form 10-Q for the period  ending  September 30, 2007 as filed with
the Securities  and Exchange  Commission on the date hereof (the  "Report"),  I,
Eric A. Rose, Chief Executive  Officer of the Company,  certify,  pursuant to 18
U.S.C. ss.1350, as adopted pursuant to ss.906 of the Sarbanes-Oxley Act of 2002,
that, to the best of my knowledge:

      (1)   The Report fully complies with the  requirements of section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      (2)   The  information  contained in the Report  fairly  presents,  in all
            material respects, the financial condition and results of operations
            of the Company.

November 13, 2007

                                                        /s/ Eric A. Rose
                                                        -----------------
                                                        Eric A. Rose, M.D.
                                                        Chief Executive Officer


                                       23
                                                                    Exhibit 32.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Quarterly  Report of SIGA  Technologies,  Inc. (the
"Company") on Form 10-Q for the period  ending  September 30, 2007 as filed with
the Securities  and Exchange  Commission on the date hereof (the  "Report"),  I,
Thomas N. Konatich, Chief Financial Officer of the Company, certify, pursuant to
18 U.S.C.  ss.1350,  as adopted pursuant to ss.906 of the  Sarbanes-Oxley Act of
2002, that, to the best of my knowledge:

      (3)   The Report fully complies with the  requirements of section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      (4)   The  information  contained in the Report  fairly  presents,  in all
            material respects, the financial condition and results of operations
            of the Company.

November 13, 2007

                                                /s/ Thomas N. Konatich
                                                ----------------------
                                                Thomas N. Konatich
                                                Chief Financial Officer


                                       24