Aeluma, Inc. (ALMU) has 8 known insider and institutional holders on record. The largest holder is Tompkins Mark N. with 1,790,488 shares. Other notable holders include Klamkin Jonathan and McCarthy Lee.
Over the last 12 months, insiders have made 62 transactions in ALMU stock — 18 buys (valued at $4.77M) and 40 sells (valued at $11.51M). Insider selling has exceeded buying during this period.
ALMU Insider Ownership
Top Holder
Tompkins Mark N.
1,790,488 shares
Buys (12 mo)
18
$4.77M value
Sells (12 mo)
40
$11.51M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Tompkins Mark N. |
Other: Former 10% Owner |
1,790,488 |
2026-02-05 |
|
| 2 |
Klamkin Jonathan |
Chief Executive Officer |
1,409,398 |
2026-04-03 |
|
| 3 |
Mccarthy Lee |
10 Percent Owner |
977,425 |
2026-01-02 |
|
| 4 |
Denbaars Steven |
Director |
395,209 |
2026-03-02 |
|
| 5 |
Jacobs Ian Seth |
Officer |
200,000 |
2021-06-23 |
|
| 6 |
Ensley Craig H |
Director |
27,300 |
2026-03-02 |
|
| 7 |
Paglia John Kenneth |
Director |
23,361 |
2026-03-02 |
|
| 8 |
Byron Michael |
Director |
3,653 |
2026-03-02 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Klamkin Jonathan |
Chief Executive Officer |
Informative Sell |
20,000 |
$13.10 |
$261.95K |
| 2026-03-04 |
Klamkin Jonathan |
10 Percent Owner, Officer: Chief Executive Officer |
Informative Sell |
21,794 |
$18.41 |
$401.25K |
| 2025-12-03 |
Denbaars Steven |
Director |
RSU Award |
10,121 |
- |
- |
| 2025-12-03 |
Paglia John Kenneth |
Director |
RSU Award |
10,861 |
- |
- |
| 2025-12-03 |
Byron Michael |
Director |
RSU Award |
13,343 |
- |
- |
| 2025-09-01 |
Byron Michael |
Director |
RSU Award |
3,653 |
$18.27 |
$66.74K |
| 2025-12-03 |
Ensley Craig H |
Director |
RSU Award |
10,633 |
- |
- |
| 2026-02-26 |
Denbaars Steven |
Director |
Informative Sell |
12,500 |
$15.85 |
$198.09K |
| 2026-02-25 |
Denbaars Steven |
Director |
Informative Sell |
12,500 |
$17.58 |
$219.77K |
| 2026-02-04 |
Tompkins Mark N. |
Other: Former 10% Owner |
Informative Sell |
5,956 |
$15.12 |
$90.05K |
| 2026-02-02 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
37,500 |
$15.74 |
$590.25K |
| 2026-01-30 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
908 |
$16.79 |
$15.25K |
| 2026-01-29 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
5,203 |
$17.16 |
$89.28K |
| 2026-01-22 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
962 |
$18.81 |
$18.1K |
| 2026-01-21 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
10 |
$21.24 |
$212.40 |
| 2026-01-20 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
888 |
$21.58 |
$19.16K |
| 2023-02-17 |
Mccarthy Lee |
10 Percent Owner |
Informative Sell |
649,570 |
$0.01 |
$3.96K |
| 2025-12-26 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
2,662 |
$18.39 |
$48.95K |
| 2025-12-24 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
15,000 |
$16.05 |
$240.75K |
| 2025-12-23 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
15,000 |
$14.87 |
$223.05K |
| 2025-12-22 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
35,000 |
$14.83 |
$519.05K |
| 2025-12-19 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
30,000 |
$14.70 |
$441K |
| 2025-12-18 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
20,000 |
$14.37 |
$287.4K |
| 2025-12-10 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
20,000 |
$17.49 |
$349.8K |
| 2025-12-09 |
Tompkins Mark N. |
10 Percent Owner |
Informative Sell |
19,139 |
$17.06 |
$326.51K |
