Eos Energy Enterprises's top three insider shareholders as of April 28, 2026 are Riley Financial, Inc. B. (TenPercentOwner, 5.37Mn shares), Russell Monoki Stidolph (Director, 4.47Mn shares), Russell Monoki Stidolph (Director, 2.65Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Riley Financial, Inc. B. | - | 0 | 5,369,778 | 19 Nov, 2021 |
| Russell Monoki Stidolph | - | 0 | 4,469,292 | 05 Aug, 2021 |
| Russell Monoki Stidolph | - | 0 | 2,653,272 | 03 Jan, 2022 |
| Russell Monoki Stidolph | - | 364,355 | 2,048,273 | 08 Dec, 2025 |
| Joe Mastrangelo | Chief Executive Officer | 1,487,126 | 0 | 05 Mar, 2026 |
| Nathan Kroeker | Cco And Interim Cfo | 662,512 | 0 | 26 Jan, 2026 |
| Alexander Dimitrief | - | 235,221 | 0 | 04 Mar, 2026 |
| Randall B Gonzales | Chief Financial Officer | 188,094 | 0 | 13 Jan, 2023 |
| Melissa Berube | General Counsel | 171,836 | 0 | 30 Jan, 2024 |
| Sumeet Puri | Chief Accounting Officer | 164,290 | 0 | 08 Sep, 2025 |
| Claude Demby | - | 141,708 | 0 | 16 May, 2025 |
| Jeffrey S Bornstein | - | 115,759 | 0 | 08 Dec, 2025 |
| Audrey Ann Zibelman | - | 104,897 | 0 | 02 May, 2024 |
| Jeff Mcneil | - | 99,179 | 0 | 08 Dec, 2025 |
| Sagar Kurada | Chief Financial Officer | 66,939 | 0 | 05 Jan, 2022 |
| Joseph Nigro | - | 35,385 | 0 | 16 May, 2025 |
| John J Tedone | Chief Accounting Officer | 25,487 | 0 | 16 Feb, 2023 |
| Alexander Dimitrief | - | 0 | 10,000 | 12 Mar, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 04 Mar, 2026 | Joe Mastrangelo | Common Stock | A | 23,900 | $6.58 | 1,487,126 | D | P |
| 02 Mar, 2026 | Alexander Dimitrief | Common Stock | A | 15,000 | $6.04 | 235,221 | D | P |
| 02 Mar, 2026 | Joe Mastrangelo | Common Stock | A | 60,000 | $5.75 | 1,463,226 | D | P |
| 23 Jan, 2026 | Nathan Kroeker | Common Stock | A | 100,000 | $0.00 | 712,512 | D | M |
| 26 Jan, 2026 | Nathan Kroeker | Common Stock | D | 50,000 | $16.04 | 662,512 | D | S |
| 23 Jan, 2026 | Nathan Kroeker | Restricted Stock Units | D | 100,000 | $0.00 | 0 | D | M |
| 22 Dec, 2025 | Joseph Nigro | Restricted Stock Units | A | 3,565 | $0.00 | 3,565 | D | A |
| 05 Dec, 2025 | Russell Monoki Stidolph | Common Stock | D | 500,000 | $14.99 | 2,153,272 | I | S |
| 05 Dec, 2025 | Alexander Dimitrief | Common Stock | A | 18,473 | $14.43 | 237,925 | D | M |
| 04 Dec, 2025 | Jeff Mcneil | Common Stock | D | 16,000 | $0.00 | 99,179 | D | G |
| 05 Dec, 2025 | Jeffrey S Bornstein | Common Stock | D | 32,328 | $15.05 | 115,759 | D | S |
| 04 Dec, 2025 | Jeffrey S Bornstein | Common Stock | D | 8,000 | $15.75 | 0 | I | S |
| 08 Dec, 2025 | Russell Monoki Stidolph | Common Stock | D | 29,999 | $15.36 | 2,123,273 | I | S |
| 05 Dec, 2025 | Alexander Dimitrief | Common Stock | D | 17,704 | $15.03 | 220,221 | D | F |
| 05 Dec, 2025 | Russell Monoki Stidolph | Common Stock | D | 75,000 | $0.00 | 2,048,273 | I | J |
| 05 Dec, 2025 | Alexander Dimitrief | Stock Option (Right to Buy) | D | 18,473 | $0.00 | 0 | D | M |
| 05 Dec, 2025 | Russell Monoki Stidolph | Common Stock | A | 75,000 | $0.00 | 439,355 | D | J |
| 05 Dec, 2025 | Russell Monoki Stidolph | Common Stock | D | 60,000 | $0.00 | 379,355 | D | G |
| 05 Dec, 2025 | Russell Monoki Stidolph | Common Stock | D | 15,000 | $0.00 | 364,355 | D | G |
| 08 Dec, 2025 | Russell Monoki Stidolph | Common Stock | A | 30,788 | $14.43 | 395,143 | D | M |