secwatch / observer
8-K filed July 9, 2026, 4:24 PM ET ticker EOSE CIK 0001805077
leadership confidence high sentiment neutral materiality 0.50

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

Eos Energy Enterprises, Inc.

item 5.02item 8.01item 9.01

Executive movements

Machine-extracted from this filing. Every card cites the SEC source. See all recent executive movements.

Departed

Nathaniel Fick

Class III director
EOSE · Eos Energy Enterprises, Inc.
Effective
2026-07-08
Successor
Haiyan Song
Filed
July 9, 2026, 4:24 PM ET
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.
Appointed

Haiyan Song

Class III director
EOSE · Eos Energy Enterprises, Inc.
Effective
2026-07-09
Filed
July 9, 2026, 4:24 PM ET
On July 9, 2026, the Board appointed Haiyan Song, age 60, to the Board.
Appointed

Nathaniel Fick

preferred stock director
EOSE · Eos Energy Enterprises, Inc.
Effective
2026-07-08
Filed
July 9, 2026, 4:24 PM ET
Nathaniel Fick will succeed Mr. Nixon as a preferred stock director of the Board, effective July 8, 2026.
Departed

Greg Nixon

preferred stock director
EOSE · Eos Energy Enterprises, Inc.
Effective
2026-07-08
Successor
Nathaniel Fick
Filed
July 9, 2026, 4:24 PM ET
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.

Key facts

Extracted from this filing and checked against the source text.

Executive change SEC 8-K Item 5.02 confidence 0.95

Nathaniel Fick resigned as Class III director at Eos Energy Enterprises, Inc..

Action
resigned
Role
Class III director
Exact text from the filing
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.
View on SEC.gov
Executive change SEC 8-K Item 5.02 confidence 0.95

Haiyan Song was appointed as Class III director at Eos Energy Enterprises, Inc..

Action
appointed
Role
Class III director
Exact text from the filing
On July 9, 2026, the Board appointed Haiyan Song, age 60, to the Board.
View on SEC.gov
Executive change SEC 8-K Item 5.02 confidence 0.95

Nathaniel Fick was elected as preferred stock director at Eos Energy Enterprises, Inc..

Action
elected
Role
preferred stock director
Exact text from the filing
Nathaniel Fick will succeed Mr. Nixon as a preferred stock director of the Board, effective July 8, 2026.
View on SEC.gov
Executive change SEC 8-K Item 5.02 confidence 0.95

Greg Nixon resigned as preferred stock director at Eos Energy Enterprises, Inc..

Action
resigned
Role
preferred stock director
Exact text from the filing
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.
View on SEC.gov

Eos Energy Enterprises, Inc. filing history →

Source: SEC EDGAR
accession 0001628280-26-047796
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