Aeluma ALMU Insider Ownership

NASDAQ ALMU
$13.12 +0.54 (+4.29%)
At close: Oct 2, 2026 · 4:00 PM EDT

Insider Holdings by Owner

6.23Mn Shares

Insider Ownership Statistics

as of 31 Dec, 2026
Insider Ownership
35.25%
■0% pp QoQ
Shares Held by Insiders
6.23Mn
filed for Dec 2026
■0.00% QoQ
Shares Outstanding
17.67Mn
17,665,755 shares
Direct Holdings
5.00Mn
Indirect: 1.23Mn
Net Shares Traded (QoQ)
0
no net change in Dec 2026
Insiders Holding Shares
5
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 31 Dec, 2026

Across the past 12 months, open-market trades by Aeluma insiders were all sales, totaling $21.33 million (1.25Mn shares).

Form 4 Holdings

Insiders Holding ALMU

Insiders 5
Shares held 6.23Mn
Of outstanding 35.25%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Mark N. Tompkins Other 4,506,321 0 4,506,321 72.4% 05 Feb, 2026
2 Jonathan Klamkin Chief Executive Officer 42,302 1,226,995 1,269,297 20.4% 23 Sep, 2026
3 Steven Denbaars Director 345,209 0 345,209 5.5% 28 Aug, 2026
4 Christopher P. Stewart Chief Financial Officer 67,781 0 67,781 1.1% 01 Oct, 2026
5 Michael Byron Director 38,343 0 38,343 0.6% 23 Sep, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

122 Insider Transactions

Source SEC Form 4
Latest quarter Dec 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
30 Sep, 2026 Christopher P. Stewart Chief Financial Officer Disposed F 5,697 $12.36 $70.41K 67,781 Direct
21 Sep, 2026 Jonathan Klamkin Chief Executive Officer Disposed S 100,000 $13.35 $1.34Mn 1,226,995 Indirect
21 Sep, 2026 Michael Byron Director Acquired M 25,000 $5.93 $148.25K 38,343 Direct
21 Sep, 2026 Christopher P. Stewart Chief Financial Officer Acquired A 15,886 $0.00 $0 15,886 Direct
21 Sep, 2026 Jonathan Klamkin Chief Executive Officer Acquired A 31,771 $0.00 $0 34,174 Direct
21 Sep, 2026 Christopher P. Stewart Chief Financial Officer Acquired A 4,042 $0.00 $0 19,928 Direct
21 Sep, 2026 Michael Byron Director Disposed M 25,000 $0.00 $0 20,833 Direct
21 Sep, 2026 Christopher P. Stewart Chief Financial Officer Disposed F 1,450 $13.61 $19.73K 18,478 Direct
21 Sep, 2026 Jonathan Klamkin Chief Executive Officer Acquired A 12,675 $0.00 $0 46,849 Direct
21 Sep, 2026 Jonathan Klamkin Chief Executive Officer Disposed F 4,547 $13.61 $61.88K 42,302 Direct
21 Sep, 2026 Christopher P. Stewart Chief Financial Officer Acquired A 37,568 $0.00 $0 37,568 Direct
21 Sep, 2026 Jonathan Klamkin Chief Executive Officer Acquired A 75,135 $0.00 $0 75,135 Direct
26 Aug, 2026 Steven Denbaars Director Disposed S 12,500 $13.84 $173.04K 357,709 Direct
26 Aug, 2026 Steven Denbaars Director Disposed S 12,500 $13.84 $173.04K 357,709 Direct
27 Aug, 2026 Steven Denbaars Director Disposed S 12,500 $13.82 $172.70K 345,209 Direct
27 Aug, 2026 Steven Denbaars Director Disposed S 12,500 $13.82 $172.70K 345,209 Direct
03 Aug, 2026 Jonathan Klamkin Chief Executive Officer Disposed G 20,000 $0.00 $0 1,326,995 Indirect
03 Aug, 2026 Jonathan Klamkin Chief Executive Officer Acquired G 20,000 $0.00 $0 22,403 Direct
03 Aug, 2026 Jonathan Klamkin Chief Executive Officer Disposed S 4,190 $16.29 $68.26K 18,213 Direct
03 Aug, 2026 Jonathan Klamkin Chief Executive Officer Disposed S 15,810 $16.85 $266.38K 2,403 Direct