| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
See Remarks | Former 10% Owner | 10% Owner +4 more
7 companies
Mark N. Tompkins is Former Director at GUER and has filed Form 4s across 7 companies. From June 2017 to May 2026, the filings on record show 6 open-market purchases and 28 sales. The disclosed holdings are worth an estimated $42.2M at current prices.
Historically, Mark N. Tompkins's trades have earned a strong insider score of 86/100 across 74 rated trades. Over a 12-month horizon, 100.0% of those trades were profitable, with an average 12-month return of +66.7%.
The biggest single holding is ALMU (~$26.2M) as Former 10% Owner. The ALMU filings lean toward selling, a net 684,092 shares.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 9, 2025 | ALMU Aeluma, Inc. | 10% Owner | Sell | 106,908 | $17.25 | $1,844,012.72 | -4.0% | +17.3% | -30.9% | |
| Oct 6, 2025 | ALMU Aeluma, Inc. | 10% Owner | Sell | 129,751 | $18.00 | $2,335,088.62 | -4.6% | +4.2% | -29.0% | |
| Oct 1, 2025 | ALMU Aeluma, Inc. | 10% Owner | Sell | 109,080 | $16.82 | $1,834,643.38 | -3.7% | +1.2% | -26.8% | |
| Dec 22, 2022 | ALMU Aeluma, Inc. | 10% Owner | Buy | 83,333 | $3.00 | $249,999.00 | +3.2% | - | - | |
| Nov 12, 2021 | GUER Guerrilla Rf, Inc. | Former Director | Buy | 250,000 | $2.00 | $500,000.00 | +10.2% | - | - | |
| Jun 25, 2021 | ALMU Aeluma, Inc. | 10% Owner, Former Director | Buy | 357,500 | $2.00 | $715,000.00 | +15.7% | - | - | |
| Jun 1, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 53,316 | $2.46 | $131,224.04 | -2.5% | -19.4% | -77.1% | |
| May 27, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 47,497 | $2.30 | $109,094.02 | -2.2% | -19.2% | -75.6% | |
| May 24, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 69,871 | $2.22 | $154,791.81 | -3.2% | -19.0% | -72.1% | |
| May 19, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 68,225 | $2.22 | $151,397.42 | -3.0% | -18.5% | -73.0% |