MLACU · Insider Trading
Mountain Lake Acquisition Corp. Units
Every open-market purchase and sale reported by MLACU officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-10 | Mountain Lake Acquisition Sponsor LLC | 10%+ Owner | J | −2,781,776 deriv. | — |
| 2026-06-04 | Paul Grinberg | Chief Executive Officer | J | +478,010 deriv. | — |
| 2026-06-04 | Jaime Vieser | Director | J | +478,010 deriv. | — |
| 2026-06-04 | Douglas Horlick | CFO and President | J | +478,010 deriv. | — |
| 2024-12-16 | Mountain Lake Acquisition Sponsor LLC | 10%+ Owner | Buy | +495,000 | — |
| 2024-12-16 | Paul Grinberg | Chief Executive Officer | Buy | +12,500 | — |
| 2024-12-16 | Douglas Horlick | CFO | Buy | +12,500 | — |
| 2024-12-16 | Jaime Vieser | Director | Buy | +25,000 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Mountain Lake Acquisition Sponsor LLC | 10%+ Owner | 495,000 | $1.78M |
| Jaime Vieser | Director | 25,000 | $90.00K |
| Paul Grinberg | Chief Executive Officer | 12,500 | $45.00K |
| Douglas Horlick | CFO and President | 12,500 | $45.00K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MLACU quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.