MAMO · Insider Trading
Massimo Group Common Stock
Every open-market purchase and sale reported by MAMO 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 |
|---|---|---|---|---|---|
| 2025-06-03 | Paolo Pietrogrande | Director | A | +2,250 | — |
| 2025-06-02 | Mark Sheffield | Director | A | +2,250 | — |
| 2025-06-02 | David Shan | Chief Executive Officer | A | +37,500 | — |
| 2025-06-02 | Michael Glenn Smith | — | A | +25,000 | — |
| 2025-06-02 | Yunhao Chen | Chief Financial Officer | A | +25,000 | — |
| 2025-06-02 | Ting Zhu | Director | A | +2,250 | — |
| 2025-03-21 | Ting Zhu | Director | A | +2,250 | — |
| 2025-03-21 | Mark Sheffield | Director | A | +2,250 | — |
| 2025-03-21 | Paolo Pietrogrande | Director | A | +2,250 | — |
| 2025-01-27 | Mark Sheffield | Director | Buy | +50 | — |
| 2024-12-26 | David Shan | Chief Executive Officer | A | +37,500 | — |
| 2024-12-05 | Yunhao Chen | Chief Financial Officer | A | +27,778 | — |
| 2024-11-22 | Yunhao Chen | Chief Financial Officer | A | +25,000 | — |
| 2024-11-22 | Paolo Pietrogrande | Director | A | +2,250 | — |
| 2024-11-22 | Ting Zhu | Director | A | +2,250 | — |
| 2024-11-22 | Michael Glenn Smith | Vice President | A | +25,000 | — |
| 2024-11-22 | Mark Sheffield | Director | A | +2,250 | — |
| 2024-11-22 | David Shan | Chief Executive Officer | A | +37,500 | — |
| 2024-10-10 | Yunhao Chen | Chief Financial Officer | A | +55,556 | — |
| 2024-10-10 | Ting Zhu | Director | A | +2,250 | — |
| 2024-10-10 | Mark Sheffield | Director | A | +2,250 | — |
| 2024-10-10 | Paolo Pietrogrande | Director | A | +2,250 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| David Shan | Chief Executive Officer | 32,160,000 | $30.51M |
| Yunhao Chen | Chief Financial Officer | 133,334 | $126.49K |
| Michael Glenn Smith | Vice President | 50,000 | $47.44K |
| Mark Sheffield | Director | 9,000 | $8.54K |
| Ting Zhu | Director | 9,000 | $8.54K |
| Paolo Pietrogrande | Director | 9,000 | $8.54K |
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 MAMO 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.