SIGA Technologies (SIGA) General Counsel nets shares from RSU vesting

Rhea-AI Filing Summary

SIGA Technologies General Counsel Larry R. Miller reported routine equity compensation activity. On March 25, 2026, one-third of previously granted restricted stock units vested, resulting in the acquisition of 6,920 shares of common stock. To cover tax obligations, 3,526 shares were withheld by the company, leaving Miller with 51,912 common shares held directly after these transactions. The RSUs vest in three equal annual installments from the original March 25, 2024 grant date.

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^*

Miller Larry R.

(Last) (First) (Middle)

C/O SIGA TECHNOLOGIES, INC.

31 EAST 62ND STREET

(Street)

NEW YORK NEW YORK 10065

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/25/2026

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

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

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

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	03/25/2026		M		6,920(1)	A	$0	55,438	D
Common Stock, par value $.0001 per share	03/25/2026		F		3,526(2)	D	$4.99	51,912	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)	03/25/2026		M			6,920	(3)	(3)	Common Stock, par value $.0001 per share	6,920	$0	6,921	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 25, 2024.

2. Represents the withholding by the Issuer of shares of Common Stock (based on $4.99 per share, the closing stock price on March 25, 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	03/26/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

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

SIGA reported that General Counsel Larry R. Miller had one-third of a prior restricted stock unit grant vest, converting into 6,920 shares of common stock. This reflects routine equity compensation rather than an open-market purchase or sale.

How many SIGA (SIGA) shares were withheld for taxes in this Form 4?

The company withheld 3,526 shares of SIGA common stock at $4.99 per share to satisfy tax obligations. This withholding is classified as a tax-related disposition, not an open-market sale by the insider.

What is Larry R. Miller’s SIGA (SIGA) shareholding after these transactions?

Following the RSU vesting and tax withholding, Larry R. Miller directly holds 51,912 shares of SIGA common stock. This figure reflects his updated ownership position after the routine compensation-related equity adjustments on March 25, 2026.

How do SIGA (SIGA) restricted stock units vest for Larry R. Miller?

The restricted stock units granted to Larry R. Miller on March 25, 2024 vest over three years. They vest in three equal installments, with one-third of the RSUs becoming common stock on each of the first three anniversaries of the grant date.

Was the SIGA (SIGA) Form 4 a market buy or sell by Larry R. Miller?

No, the Form 4 reflects RSU vesting and related tax withholding, not an open-market buy or sell. Miller acquired shares through a derivative exercise and had a portion withheld by SIGA to cover tax liabilities.