---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-057308"
form_type: "8-K"
ticker: "SLS"
cik: "0001390478"
company_name: "SELLAS Life Sciences Group, Inc."
filed_at: "2025-06-06T23:59:59+00:00"
generated_at: "2026-05-19T18:14:05.548610+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# SELLAS appoints Baker Tilly as new auditor after Moss Adams merger

## Summary
- Moss Adams merged into Baker Tilly US, LLP; auditors resigned June 3, 2025.
- Audit committee approved Baker Tilly as successor independent auditor for FY2025.
- No disagreements or reportable events occurred in prior fiscal years or interim.
- Moss Adams' reports on 2024/2023 financials included going-concern explanatory paragraph.

## SEC filing metadata
- accession: 0001104659-25-057308
- form_type: 8-K
- ticker: SLS
- cik: 0001390478
- company_name: SELLAS Life Sciences Group, Inc.
- filed_at: 2025-06-06T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1390478/000110465925057308/0001104659-25-057308-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1390478/000110465925057308/tm2517225d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-057308
- JSON: https://secwatch.observer/filing/0001104659-25-057308.json
- Plain text: https://secwatch.observer/filing/0001104659-25-057308.txt

## Key facts
- Auditor Changes
  SELLAS Life Sciences Group, Inc. engaged Baker Tilly US, LLP as its auditor.
  - Action: engagement
  - Auditor: Baker Tilly US, LLP
  source text: On June 3, 2025, the Company engaged Baker Tilly as the Company’s new independent registered public accounting firm for the fiscal year ending December 31, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1390478/000110465925057308/0001104659-25-057308-index.htm
- Auditor Changes
  Moss Adams LLP resigned as auditor of SELLAS Life Sciences Group, Inc..
  - Action: resignation
  - Auditor: Moss Adams LLP
  - Successor: Baker Tilly US, LLP
  source text: Moss Adams has resigned as the auditors of the Company and on June 3, 2025, the Audit Committee of the Company’s Board of Directors accepted the resignation of Moss Adams and approved the appointment of Baker Tilly, as the successor to Moss Adams, as the Company’s independent registered public accounting firm.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1390478/000110465925057308/0001104659-25-057308-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.