SIGA GC reports RSU vesting and new equity grant

SIGA Technologies General Counsel Larry R. Miller reported routine equity compensation activity.

Rhea-AI Filing Summary

SIGA Technologies General Counsel Larry R. Miller reported routine equity compensation activity. On March 13, 2026, 21,261 restricted stock units vested and were settled into the same number of common shares. To cover associated tax obligations, the company withheld 11,187 shares at $5.26 per share. Miller also received a new grant of 68,060 restricted stock units, which vest in three equal annual installments from the grant date. Following these transactions, he directly holds 48,518 shares of common stock and has 68,060 restricted stock units outstanding.

Insider Trade Summary

21,261 shares exercised/converted

Exercise 4 txns

Insider Miller Larry R.

Role General Counsel

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	21,261	$0.00	$0.00
Grant/Award	Restricted Stock Units	68,060	$0.00	$0.00
Exercise	Common Stock, par value $.0001 per share	21,261	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock, par value $.0001 per share	11,187	$5.26	$59K

Holdings After Transaction: Restricted Stock Units — 110,583 contracts (Direct); Common Stock, par value $.0001 per share — 48,518 shares (Direct)

Footnotes (3)

1. F1. Represents the acquisition of Common Stock from the vesting of one-third of the restricted stock units ("RSUs") granted on March 13, 2025.
2. F2. 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. F3. 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did SIGA (SIGA) report for Larry R. Miller?

Larry R. Miller reported routine equity compensation activity. RSUs vested into 21,261 common shares, some shares were withheld for taxes, and he received a new grant of 68,060 restricted stock units, all recorded as of March 13, 2026.

How many SIGA common shares did Larry R. Miller acquire through RSU vesting?

Miller acquired 21,261 SIGA common shares through RSU vesting. These shares resulted from one-third of a prior restricted stock unit grant vesting on March 13, 2026, with the RSUs converting into common stock on a one-for-one basis.

How were taxes handled on Larry R. Miller’s SIGA RSU vesting?

Taxes were satisfied via share withholding. SIGA withheld 11,187 common shares, valued at $5.26 per share based on the March 13, 2026 closing price, to cover tax withholding obligations tied to the RSU vesting and share issuance.

What new SIGA restricted stock unit grant did Larry R. Miller receive?

Miller received a grant of 68,060 new restricted stock units. These RSUs are contingent rights to receive 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 many SIGA shares does Larry R. Miller hold after these transactions?

After the reported transactions, Miller holds 48,518 common shares directly. This reflects RSU vesting into shares and the share withholding for taxes, as disclosed in the Form 4’s post-transaction ownership figures.

Are Larry R. Miller’s SIGA transactions open-market buys or sales?

No open-market buys or sales were reported. The filing shows RSU vesting, a tax-withholding share disposition, and a new RSU grant. These are compensation and tax events rather than discretionary market purchases or sales.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/17/2026 - 04:07 PM Learn about SEC filing dates

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
Estimated average burden
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^*

Miller Larry R.

(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)
	General Counsel

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		21,261(1)	A	$0	59,705	D
Common Stock, par value $.0001 per share	03/13/2026		F		11,187(2)	D	$5.26	48,518	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			21,261	(3)	(3)	Common Stock, par value $.0001 per share	21,261	$0	42,523	D
Restricted Stock Units	(3)	03/13/2026		A		68,060		(3)	(3)	Common Stock, par value $.0001 per share	68,060	$0	68,060	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	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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