SECURITIES AND EXCHANGE COMMISSION[1]	
Washington, D.C. 20549	
 	
SCHEDULE 13G/A	
 	
Under the Securities Exchange Act of 1934	
(Amendment No. 1)	
 	
SIGA Technologies, Inc.	
(Name of Issuer)	
 	
Common Stock	
(Title of Class of Securities)	
 	
826917106	
(CUSIP Number)	
 	
December 31, 2013	
(Date of Event Which Requires Filing of This Statement)	

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:	
 	
¨	Rule 13d-1(b)	
þ	Rule 13d-1(c)	
¨	Rule 13d-1(d)	
 	
(Page 1 of 9 Pages)	

 	

CUSIP No. 826917106	13G/A	Page 2 of 9 Pages	
 
1	NAME OF REPORTING PERSON
JET CAPITAL INVESTORS, L.P.	 	
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨
(b) ₫	 	
3	SEC USE ONLY	 	
4	CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware, USA	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH:	5	SOLE VOTING POWER
0	 	
 	6	SHARED VOTING POWER
4,189,194	 	 	
 	7	SOLE DISPOSITIVE POWER
0	 	 	 	
 	8	SHARED DISPOSITIVE POWER
4,189,194	 	 	 	
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,189,194	 	 	 	
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨	 	 	 	
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
7.9%	 	 	 	
12	TYPE OF REPORTING PERSON
IA	 	 	 	

 	

CUSIP No. 826917106	13G/A	Page 3 of 9 Pages	

1	NAME OF REPORTING PERSON
Jet Capital Management, L.L.C.	 	
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨
(b) ₫	 	
3	SEC USE ONLY	 	
4	CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware, USA	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH:	5	SOLE VOTING POWER
0	 	
 	6	SHARED VOTING POWER
3,002,599	 	 	
 	7	SOLE DISPOSITIVE POWER
0	 	 	 	
 	8	SHARED DISPOSITIVE POWER
3,002,599	 	 	 	
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
3,002,599	 	 	 	
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨	 	 	 	
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.67%	 	 	 	
12	TYPE OF REPORTING PERSON
OO	 	 	 	

 	

CUSIP No. 826917106	13G/A	Page 4 of 9 Pages	
 
1	NAME OF REPORTING PERSON
Alan S. Cooper	 	
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨
(b) ₫	 	
3	SEC USE ONLY	 	
4	CITIZENSHIP OR PLACE OF ORGANIZATION
USA	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH:	5	SOLE VOTING POWER
0	 	
 	6	SHARED VOTING POWER
4,189,194	 	 	
 	7	SOLE DISPOSITIVE POWER
0	 	 	 	
 	8	SHARED DISPOSITIVE POWER
4,189,194	 	 	 	
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,189,194	 	 	 	
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨	 	 	 	
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
7.9%	 	 	 	
12	TYPE OF REPORTING PERSON
IN	 	 	 	

 	

CUSIP No. 826917106	13G/A	Page 5 of 9 Pages	
 
1	NAME OF REPORTING PERSON
Matthew Mark	 	
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨
(b) ₫	 	
3	SEC USE ONLY	 	
4	CITIZENSHIP OR PLACE OF ORGANIZATION
USA	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH:	5	SOLE VOTING POWER
0	 	
 	6	SHARED VOTING POWER
4,189,194	 	 	
 	7	SOLE DISPOSITIVE POWER
0	 	 	 	
 	8	SHARED DISPOSITIVE POWER
4,189,194	 	 	 	
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,189,194	 	 	 	
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨	 	 	 	
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
7.9%	 	 	 	
12	TYPE OF REPORTING PERSON
IN	 	 	 	

 	

CUSIP No. 826917106	13G/A	Page 6 of 9 Pages	
 
Item 1(a).	NAME OF ISSUER	
 	SIGA TECHNOLOGIES, INC.	

Item 1(b).	ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES	
 	660 Madison Avenue, Suite 1700, New York, NY 10065	

Item 2(a).	NAME OF PERSON FILING	
 	(i) Jet Capital Investors, L.P. (the "Investment Manager"), a Delaware limited partnership which serves as investment manager to Jet Capital Master Fund LP (the "Master Fund") and certain discretionary accounts (the "Discretionary Accounts", and together with the Master Fund, the "Funds") with respect to shares of common stock directly owned by the Funds and the Discretionary Accounts.
 
(ii) Jet Capital Management, L.L.C. (the "General Partner"), a Delaware limited liability company which serves as the general partner of the Master Fund, with respect to shares of common stock directly owned by the Master Fund.
 
(iii) Alan S. Cooper ("Mr. Cooper"), who, together with Mr. Mark, is responsible for the supervision and conduct of all investment activities of the Investment Manager and the General Partner, including, without limitation, for all investment decisions with respect to the assets of the Funds, with respect to shares of common stock directly owned by the Funds, and with respect to shares of common stock directly owned by him.
 
(iv) Matthew Mark ("Mr. Mark"), who, together with Mr. Cooper, is responsible for the supervision and conduct of all investment activities of the Investment Manager and the General Partner, including, without limitation, for all investment decisions with respect to the assets of the Funds, with respect to shares of common stock directly owned by the Funds.
 	
 	The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons."  Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party.  The filing of this statement should not be construed as an admission that any of the Reporting Persons is, for the purposes of Section 13G of the Act, the beneficial owner of the Common Units reported herein.	
 
Item 2(b).	ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE	
 	(i) The Investment Manager: 540 Madison Ave, 17th Floor,  New York, NY 10022	
 	(ii) The General Partner: 540 Madison Ave, 17th Floor,  New York, NY 10022	
 	(iii) Mr. Cooper: 540 Madison Ave, 17th Floor,  New York, NY 10022	
 	(iv) Mr. Mark: 540 Madison Ave, 17th Floor,  New York, NY 10022	
 
Item 2(c).	CITIZENSHIP	
 	(i) The Investment Manager: Delaware, USA	
 	(ii) The General Partner: Delaware, USA	
 	(iii) Mr. Cooper: USA	
 	(iv) Mr. Mark: USA	

CUSIP No. 826917106	13G/A	Page 7 of 9 Pages	
 
Item 2(d).	TITLE OF CLASS OF SECURITIES	
 	Common Stock, $.0001 par value	

Item 2(e).	CUSIP NUMBER	
 	826917106	

Item 3.	IF THIS STATEMENT IS FILED PURSUANT TO Rules 13d-1(b), OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:	
 
 	(a)	¨	Broker or dealer registered under Section 15 of the Act;	
 	(b)	¨	Bank as defined in Section 3(a)(6) of the Act;	
 	(c)	¨	Insurance company as defined in Section 3(a)(19) of the Act;	
 	(d)	¨	Investment company registered under Section 8 of the Investment Company Act of 1940;	
 	(e)	¨	An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);	
 	(f)	¨	An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);
 	
 	(g)	¨	A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);	
 	(h)	¨	A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;
 	
 	(i)	¨	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;
 	
 	(j)	¨	A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J);	
 	(k)	¨	Group, in accordance with Rule 13d-1(b)(1)(ii)(K).	
 
 	If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please
specify the type of institution: _______________________________________	
 
Item 4.	OWNERSHIP	
 	The figures used to calculate beneficial ownership are based upon the 53,001,414 shares of common stock outstanding as of October 15, 2013, as reflected in SIGA Technologies, Inc.'s Form 10-Q, as filed on November 6, 2013.
 
The information required by Items 4(a)-(c) is set forth in rows 5-11 for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.	

 	

CUSIP No. 826917106	13G/A	Page 8 of 9 Pages	
 
Item 5.	OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS	
 	 	
 	Not applicable.	
  
Item 6.	OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON	
 	Not applicable.	

Item 7.	IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL PERSON	
 	Not applicable.	

Item 8.	IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP	
 	Not applicable.	

Item 9.	NOTICE OF DISSOLUTION OF GROUP	
 	Not applicable.	

Item 10.	CERTIFICATION	
 
 	Each of the Reporting Persons hereby makes the following certification:	
 	 	
 	By signing below each Reporting Person certifies that, to the best of his or its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.	

 	 	

 	

CUSIP No. 826917106	13G/A	Page 9 of 9 Pages	
 
SIGNATURES
After reasonable inquiry and to the best of his or its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.
DATE: February 14, 2014
 
Jet Capital Investors, L.P.	 	 	

/s/ Alan S. Cooper	 	 	
Name:	Alan S. Cooper	 	 	
Title:	Authorized Signatory,
Jet Capital Investors, L.P.	 	 	

 
Jet Capital Management, L.L.C.	 	 	

/s/ Alan S. Cooper	 	 	
Name:	Alan S. Cooper	 	 	
Title:	Authorized Signatory,
Jet Capital Management, L.L.C.	 	 	

 	 	 	
 	 	 	
/s/ Alan S. Cooper	 	 	
Alan s. Cooper, individually	 	 	

/s/ Matthew Mark	 	 	
Matthew mark, individually