# EDGAR Filing Document

**Accession Number:** 0001390478
**File Stem:** 9999999995-25-003386
**Filing Date:** 2025-11
**Character Count:** 1659
**Document Hash:** f3ae64c07dd660c949b2e5a6fec045ca
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-003386.hdr.sgml**: 20251126

**ACCESSION NUMBER**: 9999999995-25-003386

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251125

**DATE AS OF CHANGE**: 20251126

**EFFECTIVENESS DATE**: 20251125

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SELLAS Life Sciences Group, Inc.
- **CENTRAL INDEX KEY:** 0001390478
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-290829
- **FILM NUMBER:** 251523701

**BUSINESS ADDRESS:**
- **STREET 1:** 7 TIMES SQUARE
- **STREET 2:** SUITE 2503
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
- **BUSINESS PHONE:** 6462005278

**MAIL ADDRESS:**
- **STREET 1:** 7 TIMES SQUARE
- **STREET 2:** SUITE 2503
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Galena Biopharma, Inc.
- **DATE OF NAME CHANGE:** 20110926

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** RXi Pharmaceuticals Corp
- **DATE OF NAME CHANGE:** 20110926

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GALENA BIOPHARMA, INC.
- **DATE OF NAME CHANGE:** 20110922

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** November 25, 2025

**Time:** 17:00:00

**Form Type:** S-3

---

**CIK:** 0001390478

**Company Name:** SELLAS Life Sciences Group, Inc.

**File Number:** 333-290829