---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-047796"
form_type: "8-K"
ticker: "EOSE"
cik: "0001805077"
company_name: "Eos Energy Enterprises, Inc."
filed_at: "2026-07-09T20:24:28+00:00"
generated_at: "2026-07-09T20:26:04.954895+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Eos Energy appoints Haiyan Song to board, names Marie Martin as Chief Legal Officer

## Summary
- Haiyan Song appointed to Board of Directors effective July 9, 2026; brings cybersecurity, cloud, and software expertise.
- Greg Nixon steps down as preferred stock director; Nate Fick transitions from independent to preferred stock director.
- Marie Batz Martin named Chief Legal Officer effective July 13, 2026; succeeds Michael Silberman who remains through Sept 11.
- Martin previously Global VP and Chief Compliance Officer at Coherent Corp., with over 20 years legal experience at industrial firms.

## SEC filing metadata
- accession: 0001628280-26-047796
- form_type: 8-K
- ticker: EOSE
- cik: 0001805077
- company_name: Eos Energy Enterprises, Inc.
- filed_at: 2026-07-09T20:24:28+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1805077/000162828026047796/0001628280-26-047796-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1805077/000162828026047796/eose-20260708.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-047796
- JSON: https://secwatch.observer/filing/0001628280-26-047796.json
- Plain text: https://secwatch.observer/filing/0001628280-26-047796.txt

## Key facts
- Executive change
  Nathaniel Fick resigned as Class III director at Eos Energy Enterprises, Inc..
  - Action: resigned
  - Role: Class III director
  source text: On July 8, 2026, Nathaniel Fick resigned from his role as a Class III director of the Board, effective July 8, 2026, to accept an appointment as preferred stock director of the Board.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1805077/000162828026047796/0001628280-26-047796-index.htm
- Executive change
  Haiyan Song was appointed as Class III director at Eos Energy Enterprises, Inc..
  - Action: appointed
  - Role: Class III director
  source text: On July 9, 2026, the Board appointed Haiyan Song, age 60, to the Board.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1805077/000162828026047796/0001628280-26-047796-index.htm
- Executive change
  Nathaniel Fick was elected as preferred stock director at Eos Energy Enterprises, Inc..
  - Action: elected
  - Role: preferred stock director
  source text: Nathaniel Fick will succeed Mr. Nixon as a preferred stock director of the Board, effective July 8, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1805077/000162828026047796/0001628280-26-047796-index.htm
- Executive change
  Greg Nixon resigned as preferred stock director at Eos Energy Enterprises, Inc..
  - Action: resigned
  - Role: preferred stock director
  source text: On July 8, 2026, Greg Nixon resigned from his role as a preferred stock director of the Board of Directors (the “Board”) of Eos Energy Enterprises, Inc. (the “Company”), effective July 8, 2026, to devote more time to other business ventures.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1805077/000162828026047796/0001628280-26-047796-index.htm

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