EOSE insider buying and SEC filings, explained
Eos Energy Enterprises, Inc. · CIK 1805077
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$752K
Insiders who bought
4
Sold (not marked 10b5-1)
$8.7M
Planned sales (10b5-1)
$4.2M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 29, 2026 | Planned (10b5-1) | Michelle Buczkowski (Chief Commercial Officer) sold 50,000 shares at about $2.00 ($100K), marked as a 10b5-1 plan trade. Holdings down 31% to 111,827 shares. | SEC filing Filed Oct 29, 2026, 4:49 PM ET |
| Sep 16, 2026 | Planned (10b5-1) | Sumeet Puri (Chief Accounting Officer) sold 43,750 shares at about $3.92 ($172K), marked as a 10b5-1 plan trade. Holdings down 14% to 280,195 shares. | SEC filing Filed Sep 16, 2026 |
| Sep 16, 2026 | Planned (10b5-1) | Joe Mastrangelo (CEO and Director) sold 250,000 shares at about $3.92 ($980K), marked as a 10b5-1 plan trade. Holdings down 10% to 2,308,704 shares. | SEC filing Filed Sep 16, 2026 |
| Sep 11–14, 2026 | Purchase (code P) | Haiyan Song (Director) bought 15,000 shares between Sep 11 and Sep 14 at about $3.91 ($59K), reported as a purchase (code P). New position of 15,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 15, 2026 |
| Sep 9, 2026 | Planned (10b5-1) | Sumeet Puri (Chief Accounting Officer) sold 34,167 shares at about $4.13 ($141K), marked as a 10b5-1 plan trade. Holdings down 13% to 236,445 shares. | SEC filing Filed Sep 9, 2026 |
| Jul 28, 2026 | Planned (10b5-1) | Sumeet Puri (Chief Accounting Officer) sold 29,167 shares at about $3.36 ($98K), marked as a 10b5-1 plan trade. Holdings down 13% to 202,279 shares. | SEC filing Filed Jul 28, 2026 |
| Jul 28, 2026 | Planned (10b5-1) | Nathan Kroeker (Chief Commercial Officer) sold 110,417 shares at about $3.36 ($371K), marked as a 10b5-1 plan trade. Holdings down 11% to 887,527 shares. | SEC filing Filed Jul 28, 2026 |
| Jul 27, 2026 | Sale | Joe Mastrangelo (CEO and Director) sold 159,154 shares at $3.61 ($575K). Holdings down 8% to 1,947,586 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 28, 2026 |
| Jul 7, 2026 | Planned (10b5-1) | Nathan Kroeker (CFO) sold 79,309 shares at about $4.68 ($371K), marked as a 10b5-1 plan trade. Holdings down 9% to 777,110 shares. | SEC filing Filed Jul 7, 2026 |
| Jun 30, 2026 | Planned (10b5-1) | Sumeet Puri (Chief Accounting Officer) sold 8,823 shares at about $5.86 ($52K), marked as a 10b5-1 plan trade. Holdings down 5% to 173,112 shares. | SEC filing Filed Jun 30, 2026 |
| Jun 30, 2026 | Planned (10b5-1) | Michelle Buczkowski (Chief Administration Officer) sold 11,469 shares at about $5.87 ($67K), marked as a 10b5-1 plan trade. Holdings down 16% to 59,242 shares. | SEC filing Filed Jun 30, 2026 |
| Jun 30, 2026 | Planned (10b5-1) | Michael W Silberman (Chief Legal Officer) sold 14,998 shares at about $5.87 ($88K), marked as a 10b5-1 plan trade. Holdings down 5% to 298,277 shares. | SEC filing Filed Jun 30, 2026 |
| Jun 30, 2026 | Planned (10b5-1) | Nathan Kroeker (CFO) sold 35,289 shares at about $5.86 ($207K), marked as a 10b5-1 plan trade. Holdings down 5% to 697,801 shares. | SEC filing Filed Jun 30, 2026 |
| Mar 9, 2026 | Purchase (code P) | David Urban (Director) bought 16,250 shares at about $6.16 ($100K), reported as a purchase (code P). Holdings up 35% to 62,471 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 10, 2026 |
| Mar 4, 2026 | Purchase (code P) | Joe Mastrangelo (CEO and Director) bought 23,900 shares at $6.58 ($157K), reported as a purchase (code P). Holdings up 2% to 1,487,126 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 5, 2026 |
| Mar 2, 2026 | Purchase (code P) | Alexander Dimitrief (Director) bought 15,000 shares at $6.04 ($91K), reported as a purchase (code P). Holdings up 7% to 235,221 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 4, 2026 |
| Mar 2, 2026 | Purchase (code P) | Joe Mastrangelo (CEO and Director) bought 60,000 shares at about $5.75 ($345K), reported as a purchase (code P). Holdings up 4% to 1,463,226 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Jan 26, 2026 | Planned (10b5-1) | Nathan Kroeker (CFO) sold 50,000 shares at about $16.04 ($802K), marked as a 10b5-1 plan trade. Holdings down 7% to 662,512 shares. | SEC filing Filed Jan 26, 2026 |
| Jan 23, 2026 | Planned (10b5-1) | Michael W Silberman (Chief Legal Officer) sold 41,667 shares at about $17.74 ($739K), marked as a 10b5-1 plan trade. Holdings down 13% to 283,279 shares. | SEC filing Filed Jan 23, 2026 |
| Dec 5, 2025 | Sale | Russell Monoki Stidolph (Director) sold 500,000 shares indirectly at $14.99 ($7.5M). Indirect holdings down 19% to 2,153,272 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 8, 2025 |
| Dec 4–5, 2025 | Sale | Jeffrey S Bornstein (Director) sold 40,328 shares directly and indirectly (by entity) between Dec 4, 2025 and Dec 5, 2025 at about $15.19 ($613K). Direct holdings down 22% to 115,759 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 8, 2025 |
68 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
3 insiders bought in 30 days
$693K in purchases since Mar 2, 2026 · Purchases traded Mar 2, 2026 to Mar 9, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Joe Mastrangelo (CEO) | $345K | Mar 2, 2026 | SEC filing |
| Alexander Dimitrief (Director) | $91K | Mar 2, 2026 | SEC filing |
| Joe Mastrangelo (CEO) | $157K | Mar 4, 2026 | SEC filing |
| David Urban (Director) | $100K | Mar 9, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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