SIGA Technologies (SIGA) CFO awarded RSUs and shares on vesting

Rhea-AI Filing Summary

SIGA Technologies Executive VP & CFO Daniel J. Luckshire reported routine equity compensation activity tied to restricted stock units (RSUs). On March 13, 2026, one-third of a prior RSU grant vested, resulting in 11,503 shares of Common Stock being issued at a conversion price of $0.00 per share.

To cover tax withholding obligations from the RSU vesting and share issuance, the company withheld 6,074 shares of Common Stock, valued at $5.26 per share based on the closing price on March 13, 2026. On the same date, Luckshire also received a new grant of 55,228 RSUs, which represent contingent rights to receive Common Stock on a one-for-one basis and vest over three years, one-third on each of the first three anniversaries of the grant date.

Following these transactions, Luckshire directly owns 280,493 shares of SIGA Technologies Common Stock and holds 55,228 RSUs. The filing reflects compensation-related vesting, a new RSU award, and tax withholding, rather than open-market buying or selling.

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^*

Luckshire Daniel J

(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)
	Executive VP & CFO

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		11,503(1)	A	$0	286,567	D
Common Stock, par value $.0001 per share	03/13/2026		F		6,074(2)	D	$5.26	280,493	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			11,503	(3)	(3)	Common Stock, par value $.0001 per share	11,503	$0	23,008	D
Restricted Stock Units	(3)	03/13/2026		A		55,228		(3)	(3)	Common Stock, par value $.0001 per share	55,228	$0	55,228	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
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did SIGA (SIGA) Executive VP & CFO Daniel J. Luckshire report in this Form 4?

Luckshire reported RSU vesting, a new RSU grant, and tax withholding. One-third of a prior RSU grant vested into 11,503 Common shares, a new 55,228 RSU award was granted, and 6,074 shares were withheld to satisfy tax obligations.

How many SIGA (SIGA) restricted stock units vested and converted into shares for the CFO?

One-third of a prior RSU grant vested into 11,503 Common shares. These shares were issued at a conversion price of $0.00 per share as part of equity compensation, reflecting previously granted RSUs now settling into SIGA Technologies Common Stock.

How many SIGA (SIGA) shares were withheld for taxes in the CFO’s Form 4 filing?

The company withheld 6,074 shares of Common Stock to cover tax withholding obligations. The withholding was based on a $5.26 per-share value, which was SIGA Technologies’ closing stock price on March 13, 2026, when the RSUs vested.

What new SIGA (SIGA) RSU grant did the CFO receive in this Form 4?

Luckshire received a new grant of 55,228 restricted stock units. Each RSU represents a contingent right to receive one share of Common Stock, vesting over three years, with one-third vesting on each of the first three anniversaries of the grant date.

What are Daniel J. Luckshire’s SIGA (SIGA) holdings after these Form 4 transactions?

After the reported transactions, Luckshire directly owns 280,493 shares of SIGA Technologies Common Stock. He also holds 55,228 RSUs, which may convert into additional shares as they vest over the three-year schedule described in the award terms.

Are the SIGA (SIGA) Form 4 transactions open-market trades by the CFO?

The reported transactions are compensation-related, not open-market trades. They include RSU vesting into 11,503 shares, a new 55,228 RSU grant, and 6,074 shares withheld to satisfy tax obligations associated with the RSU vesting and share issuance.