---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-041582"
form_type: "8-K"
ticker: "ATNM"
cik: "0001388320"
company_name: "Actinium Pharmaceuticals, Inc."
filed_at: "2025-05-09T23:59:59+00:00"
generated_at: "2026-05-22T01:29:49.522416+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Actinium dismisses Marcum, engages CBIZ CPAs as auditor after Marcum acquisition

## Summary
- Marcum LLP dismissed as independent auditor on May 8, 2025, due to CBIZ CPAs acquiring its attest business.
- CBIZ CPAs engaged as new auditor for fiscal year ending Dec 31, 2025, effective May 8, 2025.
- No disagreements or reportable events occurred with Marcum during fiscal years 2024, 2023, and through May 8, 2025.
- Marcum's audit reports for 2024 and 2023 were unqualified; Marcum provided a letter agreeing with the company's disclosures.

## SEC filing metadata
- accession: 0001213900-25-041582
- form_type: 8-K
- ticker: ATNM
- cik: 0001388320
- company_name: Actinium Pharmaceuticals, Inc.
- filed_at: 2025-05-09T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1388320/000121390025041582/0001213900-25-041582-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1388320/000121390025041582/ea0241600-8k_actinium.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-041582
- JSON: https://secwatch.observer/filing/0001213900-25-041582.json
- Plain text: https://secwatch.observer/filing/0001213900-25-041582.txt

## Key facts
- Auditor Changes
  Actinium Pharmaceuticals, Inc. engaged CBIZ CPAs P.C. as its auditor.
  - Action: engagement
  - Auditor: CBIZ CPAs P.C.
  source text: On May 08, 2025, with the approval of the Company’s Audit Committee, CBIZ CPAs was engaged 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/1388320/000121390025041582/0001213900-25-041582-index.htm
- Auditor Changes
  Actinium Pharmaceuticals, Inc. dismissed Marcum LLP as its auditor.
  - Action: dismissal
  - Auditor: Marcum LLP
  source text: (a) Resignation of Independent Registered Public Accounting Firm Based on information provided by Marcum LLP (“ Marcum ”), on November 1, 2024, CBIZ CPAs P.C. (“ CBIZ CPAs ”) acquired the attest business of Marcum. On May 08, 2025, Actinium Pharmaceuticals, Inc. (the “ Company ”) dismissed Marcum as the Company’s independent registered public
  evidence_url: https://www.sec.gov/Archives/edgar/data/1388320/000121390025041582/0001213900-25-041582-index.htm

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