Insider trades › Mark N. Tompkins
Mark N. Tompkins
A corporate insider: an officer, director or owner of more than 10% of a company. Insiders report their trades to the SEC on Form 4The form insiders use to report each purchase or sale of their company's stock. It is due within two business days of the trade. · Last filing Jul 20, 2026
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Using 13F.ai, list Mark N. Tompkins's open-market buys and sells across companies in the last two years, with the Form 4 links.
Using 13F.ai, how did the stocks Mark N. Tompkins bought perform after the purchase compared with the S&P 500?
Using 13F.ai, are other insiders at the same companies buying or selling at the same time as Mark N. Tompkins?
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Buying and selling by quarter
Dollars bought and sold on the open market over the last two years.
Bought Sold
By trade date, using the shares and price reported for each trade. Stock grants, option exercises and shares withheld for tax are left out.
Roles
The companies where this person reports as an insider, and their position at each, most recent first.
| Margaree Acquisition Corp. | Director, 10% owner | Jul 20, 2026 |
| Matternet, Inc. | Director, 10% owner | May 27, 2026 |
| ALMU Aeluma, Inc. | 10% owner | Feb 5, 2026 |
| Primus Acquisition Inc. | Director, 10% owner | Jan 26, 2026 |
| Range Acquisition Corp. | Director, 10% owner | Dec 1, 2025 |
| Var Acquisition Corp. | Director, 10% owner | Sep 30, 2025 |
| Deep Fission, Inc. | Director, 10% owner | Sep 8, 2025 |
| Orielle Acquisition Corp. | Director, 10% owner | Aug 28, 2025 |
| Deep Isolation Nuclear, Inc. | Director, 10% owner | Jul 25, 2025 |
| Lomond Therapeutics Holdings, Inc. | — | Nov 5, 2024 |
Roles come from the filings themselves and can change over time.
Latest open-market trades
Purchases and sales at every company, most recent filing first.
| How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss. | Filing | ||||||
|---|---|---|---|---|---|---|---|
| Feb 4, 2026 | ALMU Aeluma, Inc. | Sale | 28,544 | $14.63 | $417.6K | -65.6% | Form 4 ↗ |
| Feb 4, 2026 | ALMU Aeluma, Inc. | Sale | 5,956 | $15.12 | $90.1K | -65.6% | Form 4 ↗ |
| Feb 2, 2026 | ALMU Aeluma, Inc. | Sale | 37,500 | $15.74 | $590.3K | -67.1% | Form 4 ↗ |
| Jan 30, 2026 | ALMU Aeluma, Inc. | Sale | 908 | $16.79 | $15.2K | -67.5% | Form 4 ↗ |
| Jan 30, 2026 | ALMU Aeluma, Inc. | Sale | 24,092 | $15.88 | $382.6K | -67.5% | Form 4 ↗ |
| Jan 29, 2026 | ALMU Aeluma, Inc. | Sale | 5,203 | $17.16 | $89.3K | -70.5% | Form 4 ↗ |
| Jan 29, 2026 | ALMU Aeluma, Inc. | Sale | 27,297 | $16.75 | $457.2K | -70.5% | Form 4 ↗ |
| Jan 22, 2026 | ALMU Aeluma, Inc. | Sale | 962 | $18.81 | $18.1K | -72.4% | Form 4 ↗ |
| Jan 22, 2026 | ALMU Aeluma, Inc. | Sale | 29,038 | $18.05 | $524.1K | -72.4% | Form 4 ↗ |
| Jan 21, 2026 | ALMU Aeluma, Inc. | Sale | 1,715 | $20.44 | $35.1K | -74.9% | Form 4 ↗ |
| Jan 21, 2026 | ALMU Aeluma, Inc. | Sale | 30,328 | $18.52 | $561.7K | -74.9% | Form 4 ↗ |
| Jan 21, 2026 | ALMU Aeluma, Inc. | Sale | 12,947 | $19.30 | $249.9K | -74.9% | Form 4 ↗ |
| Jan 21, 2026 | ALMU Aeluma, Inc. | Sale | 10 | $21.24 | $212 | -74.9% | Form 4 ↗ |
| Jan 20, 2026 | ALMU Aeluma, Inc. | Sale | 29,112 | $20.66 | $601.5K | -79.5% | Form 4 ↗ |
| Jan 20, 2026 | ALMU Aeluma, Inc. | Sale | 888 | $21.58 | $19.2K | -79.5% | Form 4 ↗ |
| Dec 26, 2025 | ALMU Aeluma, Inc. | Sale | 6,970 | $16.91 | $117.9K | -73.0% | Form 4 ↗ |
| Dec 26, 2025 | ALMU Aeluma, Inc. | Sale | 2,662 | $18.39 | $49.0K | -73.0% | Form 4 ↗ |
| Dec 26, 2025 | ALMU Aeluma, Inc. | Sale | 20,368 | $18.01 | $366.8K | -73.0% | Form 4 ↗ |
| Dec 24, 2025 | ALMU Aeluma, Inc. | Sale | 15,000 | $16.05 | $240.8K | -68.6% | Form 4 ↗ |
| Dec 23, 2025 | ALMU Aeluma, Inc. | Sale | 15,000 | $14.87 | $223.1K | -65.6% | Form 4 ↗ |
| Dec 22, 2025 | ALMU Aeluma, Inc. | Sale | 35,000 | $14.83 | $519.0K | -66.1% | Form 4 ↗ |
| Dec 19, 2025 | ALMU Aeluma, Inc. | Sale | 30,000 | $14.70 | $441.0K | -65.7% | Form 4 ↗ |
| Dec 18, 2025 | ALMU Aeluma, Inc. | Sale | 20,000 | $14.37 | $287.4K | -65.9% | Form 4 ↗ |
| Dec 10, 2025 | ALMU Aeluma, Inc. | Sale | 20,000 | $17.49 | $349.8K | -72.5% | Form 4 ↗ |
| Dec 9, 2025 | ALMU Aeluma, Inc. | Sale | 10,861 | $16.39 | $178.0K | -72.1% | Form 4 ↗ |
| Dec 9, 2025 | ALMU Aeluma, Inc. | Sale | 19,139 | $17.06 | $326.5K | -72.1% | Form 4 ↗ |
| Dec 8, 2025 | ALMU Aeluma, Inc. | Sale | 39,012 | $16.04 | $625.8K | -69.6% | Form 4 ↗ |
| Dec 8, 2025 | ALMU Aeluma, Inc. | Sale | 988 | $16.87 | $16.7K | -69.6% | Form 4 ↗ |
| Dec 5, 2025 | ALMU Aeluma, Inc. | Sale | 28,390 | $16.12 | $457.6K | -69.4% | Form 4 ↗ |
| Dec 5, 2025 | ALMU Aeluma, Inc. | Sale | 1,610 | $16.49 | $26.5K | -69.4% | Form 4 ↗ |
| Dec 4, 2025 | ALMU Aeluma, Inc. | Sale | 11,500 | $15.49 | $178.1K | -70.4% | Form 4 ↗ |
| Dec 4, 2025 | ALMU Aeluma, Inc. | Sale | 18,500 | $16.37 | $302.8K | -70.4% | Form 4 ↗ |
| Oct 20, 2025 | ALMU Aeluma, Inc. | Sale | 37,500 | $16.39 | $614.6K | -72.2% | Form 4 ↗ |
| Oct 17, 2025 | ALMU Aeluma, Inc. | Sale | 743 | $18.45 | $13.7K | -74.3% | Form 4 ↗ |
| Oct 17, 2025 | ALMU Aeluma, Inc. | Sale | 5,913 | $17.77 | $105.1K | -74.3% | Form 4 ↗ |
| Oct 17, 2025 | ALMU Aeluma, Inc. | Sale | 33,344 | $16.75 | $558.5K | -74.3% | Form 4 ↗ |
| Oct 16, 2025 | ALMU Aeluma, Inc. | Sale | 17,540 | $18.97 | $332.7K | -79.2% | Form 4 ↗ |
| Oct 16, 2025 | ALMU Aeluma, Inc. | Sale | 6,650 | $19.96 | $132.7K | -79.2% | Form 4 ↗ |
| Oct 16, 2025 | ALMU Aeluma, Inc. | Sale | 810 | $20.72 | $16.8K | -79.2% | Form 4 ↗ |
| Oct 15, 2025 | ALMU Aeluma, Inc. | Sale | 24,147 | $20.11 | $485.6K | -82.8% | Form 4 ↗ |
| Oct 15, 2025 | ALMU Aeluma, Inc. | Sale | 15,853 | $21.31 | $337.8K | -82.8% | Form 4 ↗ |
| Oct 14, 2025 | ALMU Aeluma, Inc. | Sale | 36,855 | $19.86 | $731.9K | -80.7% | Form 4 ↗ |
| Oct 13, 2025 | ALMU Aeluma, Inc. | Sale | 35,031 | $16.97 | $594.5K | -76.2% | Form 4 ↗ |
| Oct 13, 2025 | ALMU Aeluma, Inc. | Sale | 300 | $17.57 | $5,271 | -76.2% | Form 4 ↗ |
| Oct 10, 2025 | ALMU Aeluma, Inc. | Sale | 4,413 | $17.16 | $75.7K | -74.7% | Form 4 ↗ |
| Oct 10, 2025 | ALMU Aeluma, Inc. | Sale | 30,587 | $16.60 | $507.7K | -74.7% | Form 4 ↗ |
| Oct 9, 2025 | ALMU Aeluma, Inc. | Sale | 1,000 | $17.25 | $17.3K | -72.7% | Form 4 ↗ |
| Oct 9, 2025 | ALMU Aeluma, Inc. | Sale | 35,908 | $16.54 | $593.9K | -72.7% | Form 4 ↗ |
| Oct 8, 2025 | ALMU Aeluma, Inc. | Sale | 34,300 | $17.46 | $598.9K | -75.4% | Form 4 ↗ |
| Oct 8, 2025 | ALMU Aeluma, Inc. | Sale | 700 | $18.14 | $12.7K | -75.4% | Form 4 ↗ |
| Oct 7, 2025 | ALMU Aeluma, Inc. | Sale | 7,907 | $18.66 | $147.5K | -75.4% | Form 4 ↗ |
| Oct 7, 2025 | ALMU Aeluma, Inc. | Sale | 26,693 | $17.46 | $466.1K | -75.4% | Form 4 ↗ |
| Oct 7, 2025 | ALMU Aeluma, Inc. | Sale | 400 | $19.16 | $7,664 | -75.4% | Form 4 ↗ |
| Oct 6, 2025 | ALMU Aeluma, Inc. | Sale | 63,604 | $18.70 | $1.2M | -76.9% | Form 4 ↗ |
| Oct 3, 2025 | ALMU Aeluma, Inc. | Sale | 18,189 | $17.30 | $314.7K | -76.4% | Form 4 ↗ |
| Oct 3, 2025 | ALMU Aeluma, Inc. | Sale | 12,958 | $17.94 | $232.5K | -76.4% | Form 4 ↗ |
| Oct 2, 2025 | ALMU Aeluma, Inc. | Sale | 34,880 | $17.10 | $596.4K | -73.9% | Form 4 ↗ |
| Oct 2, 2025 | ALMU Aeluma, Inc. | Sale | 120 | $17.58 | $2,110 | -73.9% | Form 4 ↗ |
| Sep 30, 2025 | ALMU Aeluma, Inc. | Sale | 33,800 | $16.18 | $546.9K | -72.6% | Form 4/A ↗ |
| Aug 26, 2025 | Deep Fission, Inc. | Sale | 25,000 | — | $0 | — | Form 4 ↗ |
| Aug 26, 2025 | Orielle Acquisition Corp. | Sale | 50,000 | — | $0 | — | Form 4 ↗ |
| Jul 16, 2025 | Deep Isolation Nuclear, Inc. | Sale | 25,000 | — | $0 | — | Form 4 ↗ |
Each row links to its Form 4. Since trade compares the stock’s move from the close on the trade date (or the next trading day) to its latest close with the S&P 500 over the same days, adjusted for splits and excluding dividends. It describes the stock, not what the trader made: we don’t know their purchase price, position size or later sales. A dash means the trade isn’t matched to a listed stock, or there is no closing price after it yet.
When several people report on the same filing, we list it under the first one named, so trades by someone usually listed second may be missing here. Information, not investment advice: see the disclaimer.