# EDGAR Filing Document

**Accession Number:** 0001010086
**File Stem:** 0001140361-26-017424
**Filing Date:** 2026-4
**Character Count:** 1989
**Document Hash:** 999da74c4d245eecb35a8c6723be164e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-017424.hdr.sgml**: 20260428

**ACCESSION NUMBER**: 0001140361-26-017424

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260428

**DATE AS OF CHANGE**: 20260428

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SIGA TECHNOLOGIES INC
- **CENTRAL INDEX KEY:** 0001010086
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 133864870
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38436
- **FILM NUMBER:** 26907510

**BUSINESS ADDRESS:**
- **STREET 1:** 31 EAST 62ND STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10065
- **BUSINESS PHONE:** 212-672-9100

**MAIL ADDRESS:**
- **STREET 1:** 31 EAST 62ND STREET
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10065

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SIGA PHARMACEUTICALS INC
- **DATE OF NAME CHANGE:** 19961108

### UNITED STATES<br>

### SECURITIES AND EXCHANGE COMMISSION<br>

### Washington, D.C. 20549

### SCHEDULE 14A

#### PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE<br>

#### SECURITIES EXCHANGE ACT OF 1934
Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement 

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) 

☐ Definitive Proxy Statement 

☒ Definitive Additional Materials 

☐ Soliciting Material under §240.14a-2

## SIGA Technologies, Inc.<br>

## (Name of Registrant as Specified In Its Charter)
Payment of Filing Fee (Check all boxes that apply):

☒ No fee required <br> ☐ Fee paid previously with preliminary materials <br> ☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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