Joe Mastrangelo

Career

1. 2020 – now
   Eos Energy Enterprises (Nasdaq: EOSE)src
   Chief Executive Officer & Director
   Director and CEO since the business combination with B. Riley Principal Merger Corp. II closed in 2020; originally appointed to the board under the Director Nomination Agreement with the sponsor and sellers
2. 2019-03 – 2020
   Eos Energy Storage LLC (private)src
   Principal executive officer, then Chief Executive Officer
   Named principal executive officer on 2019-03-30 when the prior CEO resigned; formally CEO from 2019-08-01
3. 2018-03 – 2019
   Eos Energy Storage LLC (private)src
   Board advisor
   Offer letter dated 2018-07-26
4. 2015-09 – ?
   General Electric, Gas Power Systemssrc
   President & CEO
   Filings say only that he held the role 'since September 2015' before coming to Eos; the end date is not stated

Undated in the sources

• General Electric, Power Conversionsrc, President & CEO
• General Electric, GE Oil & Gas and earlier corporate rolessrc, Finance, quality and commercial leadership; GE Corporate Officer from 2008

Not located: Fully sourced from 2018-03 on. The end of the GE Gas Power Systems role (held from 2015-09) and whether it overlapped the 2018 Eos advisory role are not stated in any filing read; the Power Conversion start date and the GE Oil & Gas years are undated. eose.com and usea.org bio pages were egress-blocked (403), so only search summaries were available beyond the filings

Achievements

• Took Eos from a private company (CEO from 2019) to a Nasdaq listing through the 2020 SPAC merger with B. Riley Principal Merger Corp. IIsrc
• Before Eos, President & CEO of GE's Gas Power Systems from September 2015, after running GE Power Conversion; named a GE Corporate Officer in 2008src
• Eos revenue rose from $15.6m in FY2024 to $114.2m in FY2025, with two customers making up 51.5% and 18.8% of FY2025 revenuesrc
• Bought 83,900 shares in the open market on 2026-03-02 and 2026-03-04 (about $0.5m), days after the FY2025 resultssrc
• The first tranche of his 2024 relative-TSR PRSUs vested at 500,000 shares on 2026-09-14 after the committee certified the two-year TSR periodsrc

Education

• Clarkson University, BS Financesrc
• Westchester Community College, AS Business Administration and Managementsrc

Background

• Family No Item 401(d) family-relationship statement was found in the text of the 2026 proxy; the April 2026 CFO 8-K states only that no director or officer is related to the new CFOsrc
• Legal Named defendant, with the company and the then acting CFO, in the Yung securities class action (D.N.J., filed 2026-03-06) alleging false or misleading statements on manufacturing capability and financial outlook; also a defendant in two derivative suits consolidated on 2026-05-13 and stayed pending the class action. The company says it will contest bothsrc
• Other Employment agreement pays 24 months of salary, a pro-rated bonus and full vesting of all unvested equity on a termination without cause or for good reason; the other NEOs get 12 months or lesssrc
• Other Perquisites in 2025 included $68,700 of residential expenses, $34,845 of travel reimbursement and a car allowance; company policy bans hedging and pledgingsrc
• Investing Cerberus (CCM Denali Equity Holdings) beneficially owns 31.98% through a warrant and Series B preferred and elects a preferred-stock director; 2024 PRSUs were tied to the milestones in the Cerberus credit agreementsrc