SIGA Technologies (SIGA) EVP receives RSU grant and stock withheld for taxes

Rhea-AI Filing Summary

SIGA Technologies EVP and Chief Scientific Officer Dennis E. Hruby reported routine equity compensation activity. On March 13, 2026, one-third of a prior restricted stock unit (RSU) grant vested, converting 11,445 RSUs into the same number of common shares, while 3,955 shares were withheld at $5.26 per share to cover taxes. Following these transactions, he held 198,537 common shares directly. He also received a new award of 54,942 RSUs, which vest in three equal annual installments.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Hruby Dennis E

(Last) (First) (Middle)

C/O SIGA TECHNOLOGIES, INC.

31 EAST 62ND STREET

(Street)

NEW YORK NY 10065

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SIGA TECHNOLOGIES INC [ SIGA ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & Chief Scientific Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $.0001 per share	03/13/2026		M		11,445(1)	A	$0	202,492	D
Common Stock, par value $.0001 per share	03/13/2026		F		3,955(2)	D	$5.26	198,537	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(3)	03/13/2026		M			11,445	(3)	(3)	Common Stock, par value $.0001 per share	11,445	$0	22,891	D
Restricted Stock Units	(3)	03/13/2026		A		54,942		(3)	(3)	Common Stock, par value $.0001 per share	54,942	$0	54,942	D

Explanation of Responses:

1. Represents the acquisition of Common Stock from the vesting of one-third of the restricted stock units ("RSUs") granted on March 13, 2025.

2. Represents the withholding by the Issuer of shares of Common Stock (based on $5.26 per share, the closing stock price on March 13, 2026) to satisfy tax withholding obligations associated with the vesting of RSUs and the consequent issuance of Common Stock.

3. RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

	/s/ Larry R. Miller, as Attorney-in-Fact	03/17/2026
	** Signature of Reporting Person	Date
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FAQ

What insider transactions did SIGA EVP Dennis Hruby report on this Form 4?

Dennis Hruby reported RSU vesting, a new RSU grant, and tax-related share withholding. 11,445 RSUs converted into common shares, 3,955 shares were withheld for taxes, and 54,942 new RSUs were granted as equity compensation.

Did the SIGA EVP make any open-market stock sales in this Form 4 filing?

No open-market stock sales were reported. The only share disposition was 3,955 shares withheld by the company at $5.26 per share to satisfy tax obligations related to RSU vesting and the associated issuance of common stock.

How many SIGA common shares does Dennis Hruby hold after these transactions?

After these transactions, Dennis Hruby directly holds 198,537 shares of SIGA common stock. This reflects RSU vesting into 11,445 shares and the tax withholding of 3,955 shares, as disclosed in the Form 4 transaction tables and footnotes.

What are the terms of the new SIGA RSU grant to Dennis Hruby?

The new grant consists of 54,942 restricted stock units. According to the disclosure, the RSUs convert into common stock on a one-for-one basis and vest over three years, with one-third vesting on each of the first three anniversaries of the grant date.

How were the tax obligations handled for the SIGA RSU vesting reported?

Tax obligations were met through share withholding. The issuer withheld 3,955 shares of common stock, valued at $5.26 per share, to cover tax liabilities arising from the RSU vesting and the resulting issuance of common stock to Dennis Hruby.

Is the SIGA Form 4 for Dennis Hruby mainly compensation-related?

Yes, the filing reflects compensation-related equity activity. It includes RSU vesting that delivered common shares, a new RSU grant, and share withholding to satisfy tax obligations, with no discretionary open-market purchases or sales reported in the transactions.