SIGA Technologies Form 4: 32,258 RSUs Vest, 10,467 Shares Withheld for Taxes

Rhea-AI Filing Summary

Form 4 filing overview – SIGA Technologies, Inc. (SIGA)

Executive Vice President & Chief Scientific Officer Dennis E. Hruby reported routine equity transactions dated July 1 2025.

• RSU vesting (Code M): 32,258 restricted stock units converted to common shares at a cost basis of $0.00.
• Share withholding for taxes (Code F): 10,467 shares automatically sold/withheld at $6.49 per share to satisfy statutory tax obligations.
• Net share change: +21,791 shares, increasing direct ownership to 191,047 common shares.
• The underlying RSU grant was issued on May 11 2023 and vested 50 % on July 1 2024 and the remaining 50 % on July 1 2025; no derivative units remain outstanding after this conversion.

The filing reflects standard incentive-plan vesting mechanics rather than open-market buying or discretionary selling.

Insights

Equity Compensation Analyst

TL;DR: Routine RSU vesting; no discretionary trading; neutral impact.

The conversion of 32,258 RSUs and withholding of 10,467 shares for taxes follows SIGA’s normal equity-compensation schedule. No open-market purchase or sale occurred, and Mr. Hruby retains the majority of the vested shares, lifting his direct stake to 191,047 shares. Because the activity is automatic and tied to a pre-existing grant, it does not provide a clear signal of bullish or bearish sentiment and is unlikely to affect valuation.

Corporate Governance Specialist

TL;DR: Standard Section 16 compliance; informational only.

The Form 4 demonstrates proper disclosure under Section 16(a). The insider’s net share increase indicates alignment of management incentives with shareholders, but the absence of open-market activity limits its interpretive value. From a governance standpoint, no red flags arise; filing timeliness (reported within two business days) is in line with best practices.

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

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

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)
07/01/2025

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	07/01/2025		M		32,258	A	$0	201,514	D
Common Stock, par value $.0001 per share	07/01/2025		F		10,467(1)	D	$6.49	191,047	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	(2)	07/01/2025		M			32,258	(2)	(2)	Common Stock, par value $.0001 per share	32,258	$0	0	D

Explanation of Responses:

1. Represents the withholding by SIGA Technologies, Inc. of shares of Common Stock (based on $6.49 per share, the closing stock price on July 1, 2025) to satisfy tax withholding obligations associated with the vesting of restricted stock units ("RSUs") and the consequent issuance of Common Stock.

2. RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs were granted on May 11, 2023 and vested over two years, with the first 1/2 of such RSUs vesting on July 1, 2024 and the remaining 1/2 of such RSUs vesting on July 1, 2025.

	/s/ Larry R. Miller, as Attorney-in-Fact	07/02/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

How many SIGA shares did EVP Dennis Hruby acquire and dispose of on July 1 2025?

He acquired 32,258 shares via RSU conversion and disposed of 10,467 shares to cover taxes.

What is Dennis Hruby's total direct ownership in SIGA after the reported transactions?

Following the transactions, he directly owns 191,047 common shares.

At what price were SIGA shares withheld for tax obligations?

Shares were withheld at $6.49 per share, the closing price on July 1 2025.

Did the Form 4 report any remaining unvested or outstanding RSUs for Dennis Hruby?

No. After the July 1 2025 vesting, zero derivative securities (RSUs) remain outstanding.

Was the insider trading activity part of a Rule 10b5-1 trading plan?

The filing does not indicate that these transactions were executed under a Rule 10b5-1 plan.