As of May 30, 2026, the three largest insider holders of ALMU are Mark N. Tompkins (TenPercentOwner, 2.72Mn shares), Mark N. Tompkins (Other, 1.79Mn shares), Jonathan Klamkin (Chief Executive Officer, 1.41Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Mark N. Tompkins | - | 2,715,833 | 0 | 13 Jan, 2023 |
| Steven Denbaars | - | 385,088 | 0 | 27 Feb, 2026 |
| Jonathan Klamkin | Chief Executive Officer | 1,409,398 | 0 | 03 Apr, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 01 Apr, 2026 | Jonathan Klamkin | Common Stock | D | 20,000 | $13.10 | 1,409,398 | D | S |
| 01 Apr, 2026 | Jonathan Klamkin | Common Stock | D | 20,000 | $13.10 | 1,409,398 | D | S |
| 04 Mar, 2026 | Jonathan Klamkin | Common Stock | D | 28,206 | $17.77 | 1,451,192 | D | S |
| 04 Mar, 2026 | Jonathan Klamkin | Common Stock | D | 28,206 | $17.77 | 1,451,192 | D | S |
| 04 Mar, 2026 | Jonathan Klamkin | Common Stock | D | 21,794 | $18.41 | 1,429,398 | D | S |
| 04 Mar, 2026 | Jonathan Klamkin | Common Stock | D | 21,794 | $18.41 | 1,429,398 | D | S |
| 25 Feb, 2026 | Steven Denbaars | Common Stock | D | 12,500 | $17.58 | 397,588 | D | S |
| 26 Feb, 2026 | Steven Denbaars | Common Stock | D | 12,500 | $15.85 | 385,088 | D | S |
| 04 Feb, 2026 | Mark N. Tompkins | Common Stock | D | 28,544 | $14.63 | 1,796,444 | D | S |
| 04 Feb, 2026 | Mark N. Tompkins | Common Stock | D | 28,544 | $14.63 | 1,796,444 | D | S |
| 04 Feb, 2026 | Mark N. Tompkins | Common Stock | D | 5,956 | $15.12 | 1,790,488 | D | S |
| 04 Feb, 2026 | Mark N. Tompkins | Common Stock | D | 5,956 | $15.12 | 1,790,488 | D | S |
| 29 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 27,297 | $16.75 | 1,892,691 | D | S |
| 29 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 27,297 | $16.75 | 1,892,691 | D | S |
| 29 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 5,203 | $17.16 | 1,887,488 | D | S |
| 29 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 5,203 | $17.16 | 1,887,488 | D | S |
| 30 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 24,092 | $15.88 | 1,863,396 | D | S |
| 30 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 24,092 | $15.88 | 1,863,396 | D | S |
| 30 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 908 | $16.79 | 1,862,488 | D | S |
| 30 Jan, 2026 | Mark N. Tompkins | Common Stock | D | 908 | $16.79 | 1,862,488 | D | S |