Eos Energy Enterprises Inc
Ownership
Ownership Structure
Who owns Eos Energy Enterprises Inc (EOSE)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.1% of the shares are freely tradable; institutional investors hold 63.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.61 | 24,083,779 | +2.8 | 03/31/2026 |
| Driehaus Capital Management LLC | 4.08 | 14,869,170 | +4.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.07 | 14,835,437 | +0.0 | 03/31/2026 |
| Hudson Bay Capital Management LP | 3.76 | 13,683,634 | +0.0 | 06/30/2026 |
| Two Sigma Investments LLC | 3.51 | 12,783,883 | -9.2 | 06/30/2026 |
| State Street Corp | 2.20 | 8,017,930 | +4.3 | 03/31/2026 |
| Geode Capital Management, LLC | 2.15 | 7,812,894 | +8.4 | 03/31/2026 |
| Electron Capital Partners, LLC | 1.83 | 6,681,859 | +24.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.96 | 10,782,391 | +0.1 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.45 | 8,927,311 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Mastrangelo Joe | Chief Executive Officer | 2,308,704 | 9,234,816 $ | Sep 16, 2026 | direct |
| Kroeker Nathan | Chief Commercial Officer | 887,527 | 3,550,108 $ | Jul 28, 2026 | direct |
| Dimitrief Alexander | Director | 280,673 | 1,122,692 $ | Jul 21, 2026 | both |
| Puri Sumeet | Chief Accounting Officer | 280,195 | 1,120,780 $ | Sep 16, 2026 | direct |
| Walters Marian | Director | 171,634 | 686,536 $ | Jul 21, 2026 | direct |
| Demby Claude | Director | 157,400 | 629,600 $ | Jul 21, 2026 | direct |
| Bornstein Jeffrey S | Director | 143,806 | 575,224 $ | Jul 21, 2026 | direct |
| Urban David | Director | 97,767 | 391,068 $ | Jul 21, 2026 | direct |
| Buczkowski Michelle | Chief Administration Officer | 61,827 | 247,308 $ | Jul 21, 2026 | direct |
| Nigro Joseph | Director | 41,723 | 166,892 $ | Jul 21, 2026 | direct |
| Song Haiyan | Director | 15,000 | 60,000 $ | Sep 14, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 16, 2026 | Puri Sumeet | Chief Accounting Officer | Sell | 43,750 | 3.92 | 171,500 |
| Sep 16, 2026 | Mastrangelo Joe | Chief Executive Officer | Sell | 250,000 | 3.92 | 980,000 |
| Sep 14, 2026 | Puri Sumeet | Chief Accounting Officer | Other | 87,500 | 0.00 | – |
| Sep 14, 2026 | Mastrangelo Joe | Chief Executive Officer | Other | 500,000 | 0.00 | – |
| Sep 14, 2026 | Song Haiyan | Director | Buy | 5,000 | 3.84 | 19,200 |
| Sep 11, 2026 | Song Haiyan | Director | Buy | 10,000 | 3.95 | 39,500 |
| Sep 9, 2026 | Puri Sumeet | Chief Accounting Officer | Sell | 34,167 | 4.13 | 141,110 |
| Sep 5, 2026 | Puri Sumeet | Chief Accounting Officer | Other | 68,333 | 0.00 | – |
| Jul 28, 2026 | Puri Sumeet | Chief Accounting Officer | Sell | 29,167 | 3.36 | 98,001 |
| Jul 28, 2026 | Kroeker Nathan | Chief Commercial Officer | Sell | 110,417 | 3.36 | 371,001 |
| Jul 27, 2026 | Mastrangelo Joe | Chief Executive Officer | Sell | 159,154 | 3.61 | 574,546 |
| Jul 25, 2026 | Puri Sumeet | Chief Accounting Officer | Other | 58,334 | 0.00 | – |
| Jul 25, 2026 | Kroeker Nathan | Chief Commercial Officer | Other | 220,834 | 0.00 | – |
| Jul 25, 2026 | Mastrangelo Joe | Chief Executive Officer | Other | 333,334 | 0.00 | – |
| Jul 21, 2026 | Mastrangelo Joe | Chief Executive Officer | Other | 111,118 | 5.48 | 608,927 |
| Jul 21, 2026 | Dimitrief Alexander | Director | Other | 1,377 | 5.48 | 7,546 |
| Jul 21, 2026 | Dimitrief Alexander | Director | Other | 17,897 | 5.48 | 98,076 |
| Jul 21, 2026 | Walters Marian | Director | Other | 11,407 | 5.48 | 62,510 |
| Jul 21, 2026 | Bornstein Jeffrey S | Director | Other | 9,558 | 5.48 | 52,378 |
| Jul 21, 2026 | Urban David | Director | Other | 12,185 | 5.48 | 66,774 |
| Jul 21, 2026 | Nigro Joseph | Director | Other | 2,773 | 5.48 | 15,196 |
| Jul 21, 2026 | Buczkowski Michelle | Chief Administration Officer | Other | 2,585 | 5.48 | 14,166 |
| Jul 21, 2026 | Demby Claude | Director | Other | 1,825 | 5.48 | 10,001 |
| Jul 21, 2026 | Kroeker Nathan | Chief Commercial Officer | Other | 16,944 | 5.48 | 92,853 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.