| 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. Mark N. Tompkins's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $44.8M 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, all 56 of those trades were profitable, with an average 12-month return of +66.7%.
The biggest single holding is GUER (~$14.4M) as Former Director. Net of sales, the GUER filings show accumulation of 250,000 shares.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| May 14, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 107,424 | $2.31 | $248,250.90 | -4.5% | -8.4% | -74.4% | |
| May 11, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 36,622 | $2.51 | $91,837.69 | -1.5% | -6.2% | -72.8% | |
| May 6, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 76,133 | $2.86 | $217,821.06 | -3.0% | -20.3% | -77.8% | |
| May 3, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 61,058 | $2.74 | $167,449.29 | -100% | -26.3% | -77.8% | |
| Apr 28, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 28,419 | $2.95 | $83,834.71 | -1.1% | -26.6% | -76.7% | |
| Apr 16, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 35,627 | $3.10 | $110,509.96 | -1.4% | -21.9% | -78.8% | |
| Apr 14, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 54,083 | $3.31 | $178,859.30 | -2.0% | -33.6% | -79.7% | |
| Apr 9, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 54,450 | $3.57 | $194,184.10 | -2.0% | -34.2% | -85.8% | |
| Apr 6, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 77,828 | $4.19 | $326,287.88 | -2.8% | -28.7% | -86.0% | |
| Apr 1, 2021 | AMST Amesite Inc. | 10% Owner | Sell | 86,511 | $4.21 | $364,419.68 | -3.0% | -33.9% | -86.4% |