---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-26-050928"
form_type: "8-K"
ticker: "ARCI"
cik: "0002083910"
company_name: "Archimedes Tech SPAC Partners III Co."
filed_at: "2026-05-01T23:59:59+00:00"
generated_at: "2026-05-15T00:24:38.063649+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Archimedes Tech SPAC Partners III CEO Long resigns; Ben Landen appointed as CEO

## Summary
- Long Long resigned as CEO effective April 28, 2026; not due to disagreement with the Company.
- Long will continue to serve as a member of the board of directors.
- Ben Landen appointed CEO immediately; will remain Chief Technology Officer.
- Landen previously served as CEO and director from August to December 2025.
- Landen co-founded Superposition Venture Partners; previously VP at Cyngn Inc.

## SEC filing metadata
- accession: 0001213900-26-050928
- form_type: 8-K
- ticker: ARCI
- cik: 0002083910
- company_name: Archimedes Tech SPAC Partners III Co.
- filed_at: 2026-05-01T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2083910/000121390026050928/0001213900-26-050928-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2083910/000121390026050928/ea028825401-8k_archimedes.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-26-050928
- JSON: https://secwatch.observer/filing/0001213900-26-050928.json
- Plain text: https://secwatch.observer/filing/0001213900-26-050928.txt

## Key facts
- Executive change
  Ben Landen was appointed as Chief Executive Officer at Archimedes Tech SPAC Partners III Co..
  - Action: appointed
  - Role: Chief Executive Officer
  source text: On the same date, Ben Landen was appointed as the Chief Executive Officer by the Company’s board of directors, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2083910/000121390026050928/0001213900-26-050928-index.htm
- Executive change
  Long Long resigned as Chief Executive Officer at Archimedes Tech SPAC Partners III Co..
  - Action: resigned
  - Role: Chief Executive Officer
  source text: On April 28, 2026, Long Long notified the board of directors of Archimedes Tech SPAC Partners III Co. (the “Company”) of his resignation as Chief Executive Officer of the Company, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2083910/000121390026050928/0001213900-26-050928-index.htm

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