Comparable stake leader
Perry George Herbert
SEC ownership of Aeluma, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001828805.
Disclosed value leader
Mark N. Tompkins
Comparable rows
50/50
Latest evidence
30 Jun 2026
- Public ticker
- ALMU on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Perry George Herbert
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Perry George Herbert
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001828805
- Issuer location
- Goleta, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Aeluma, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Perry George Herbert
Disclosed value leader
Mark N. Tompkins
Comparable rows
50/50
Latest evidence
30 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 5.6%
13D/G row: Perry George Herbert
Showing 1-8 of 50 holder rows.
Quick read
Perry George Herbert leads the comparable SEC ownership view at 5.6%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Perry George Herbert's linked filing trail.
Comparable ownership
Top 5
Perry George Herbert
5.6%
BlackRock, Inc.
5.3%
Mark N. Tompkins
4.8%
AWM Investment Company, Inc.
2.6%
Lee McCarthy
1.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Perry George Herbert |
13D/G
|
5.6%
|
$14,790,000
1,000,000 shares
|
$0 | 30 Mar 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
5.3%
from 13D/G
|
$21,489,028
973,235 shares
|
— | 30 Jun 2026 |
| Mark N. Tompkins |
3/4/5
13D/G
Former 10% Owner
|
4.8%
from 13D/G
|
$28,725,311
1,824,988 shares
|
-$12,088,252 | 04 Feb 2026 |
| AWM Investment Company, Inc. |
13D/G
13F
Company
|
2.6%
|
$4,806,802
409,787 shares
|
-$4,870,448 | 30 May 2025 |
| Lee McCarthy |
3/4/5
13D/G
10%+ Owner
|
1.5%
from 13D/G
|
$12,344,877
977,425 shares
|
— | 22 Jun 2021 |
| D. E. Shaw & Co., Inc. |
13F
Company
|
4.4%
|
$17,619,465
797,983 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
3.2%
|
$12,683,127
574,417 shares
|
— | 30 Jun 2026 |
| MILLENNIUM MANAGEMENT LLC |
13F
Company
|
2.9%
|
$11,680,430
529,005 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$18,213,342.
Buys
$0
Insiders: 0
Sells
$18,213,342
Insiders: 3
Net
-$18,213,342
Shares: -1,069,186
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,069,186
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 145,000 | $0 | $2,015,702 | -$2,015,702 |
| 3-6 | 0 | 85,000 | $0 | $1,927,231 | -$1,927,231 |
| 6-9 | 0 | 329,500 | $0 | $5,634,314 | -$5,634,314 |
| 9-12 | 0 | 509,686 | $0 | $8,636,095 | -$8,636,095 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-11 of 11 reporting-owner rows connected to Aeluma, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
11
Largest Forms 3/4/5 holder
Mark N. Tompkins
Net 12M change
-$17,613,594
Latest report
30 Sep 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mark N. Tompkins | Former 10% Owner | $28,725,311 | -$12,088,252 | -30% | Filing P/S | 04 Feb 2026 |
| Jonathan Klamkin | Chief Executive Officer, Director | $22,659,098 | -$4,256,111 | -16% | Mixed | 21 Sep 2026 |
| Lee McCarthy | 10%+ Owner | $12,344,877 | Mixed | 22 Jun 2021 | ||
| Steven DenBaars | Director | $5,767,285 | -$1,269,231 | -18% | Mixed | 26 Aug 2026 |
| John Kenneth Paglia | Director | $2,118,153 | Mixed | 03 Dec 2025 | ||
| Craig H. Ensley | Director | $1,574,149 | Mixed | 03 Dec 2025 | ||
| Christopher P. Stewart | Chief Financial Officer | $1,496,604 | Mixed | 30 Sep 2026 | ||
| Michael Byron | Director | $846,613 | Mixed | 21 Sep 2026 | ||
| Ian Seth Jacobs | Former Director and Officer | $600,000 | Mixed | 22 Jun 2021 | ||
| Palvi Kumar Mehta | Director | Mixed | 15 Nov 2021 | |||
| Interim James Seo | Interim CFO | Mixed | 18 Mar 2025 |
Recent insider transactions for Aeluma, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Christopher P. Stewart | ALMU | Common Stock | Tax liability | -7.75% | -5,697 | 67,781 | 30 Sep 2026 | Direct | ||
| Christopher P. Stewart | ALMU | Common Stock | Tax liability | -7.28% | -1,450 | 18,478 | 21 Sep 2026 | Direct | ||
| Christopher P. Stewart | ALMU | Common Stock | Award | 19,928 | 19,928 | 21 Sep 2026 | Direct | |||
| Christopher P. Stewart | ALMU | Stock Option (right to buy) | Award | 37,568 | 37,568 | 21 Sep 2026 | Direct | |||
| Jonathan Klamkin | ALMU | Common Stock | Tax liability | -9.71% | -4,547 | 42,302 | 21 Sep 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Award | 1849.6% | 44,446 | 46,849 | 21 Sep 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Sale | -7.54% | $1,335,320 | $13.35 | -100,000 | 1,226,995 | 21 Sep 2026 | By Family Trust |
| Jonathan Klamkin | ALMU | Stock Option (right to buy) | Award | 75,135 | 75,135 | 21 Sep 2026 | Direct | |||
| Michael Byron | ALMU | Common Stock | Options Exercise | 187.4% | 25,000 | 38,343 | 21 Sep 2026 | Direct | ||
| Michael Byron | ALMU | Stock Option (right to buy) | Options Exercise | -54.6% | -25,000 | 20,833 | 21 Sep 2026 | Direct | ||
| Steven Denbaars | ALMU | Common Stock | Sale | -3.49% | $172,698 | $13.82 | -12,500 | 345,209 | 27 Aug 2026 | Direct |
| Steven Denbaars | ALMU | Common Stock | Sale | -3.38% | $173,044 | $13.84 | -12,500 | 357,709 | 26 Aug 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Sale | -89.3% | $334,641 | $16.73 | -20,000 | 2,403 | 03 Aug 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 832.3% | 20,000 | 22,403 | 03 Aug 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -1.48% | -20,000 | 1,326,995 | 03 Aug 2026 | By Family Trust | ||
| Jonathan Klamkin | ALMU | Common Stock | Sale | -89.3% | $421,668 | $21.08 | -20,000 | 2,403 | 01 Jul 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 832.3% | 20,000 | 22,403 | 01 Jul 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -1.46% | -20,000 | 1,346,995 | 01 Jul 2026 | By Family Trust | ||
| Jonathan Klamkin | ALMU | Common Stock | Sale | -89.3% | $500,661 | $25.03 | -20,000 | 2,403 | 01 Jun 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 832.3% | 20,000 | 22,403 | 01 Jun 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -1.44% | -20,000 | 1,366,995 | 01 Jun 2026 | By Family Trust | ||
| Steven Denbaars | ALMU | Common Stock | Sale | -3.27% | $255,797 | $20.46 | -12,500 | 370,209 | 20 May 2026 | Direct |
| Steven Denbaars | ALMU | Common Stock | Sale | -3.16% | $249,833 | $19.99 | -12,500 | 382,709 | 19 May 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Sale | -89.3% | $499,272 | $24.96 | -20,000 | 2,403 | 01 May 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 832.3% | 20,000 | 22,403 | 01 May 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -1.42% | -20,000 | 1,386,995 | 01 May 2026 | By Family Trust | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | 832.3% | 20,000 | 22,403 | 01 Apr 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -1.4% | -20,000 | 1,406,995 | 01 Apr 2026 | By Family Trust | ||
| Jonathan Klamkin | ALMU | Common Stock | Sale | -1.4% | $261,950 | $13.10 | -20,000 | 1,409,398 | 01 Apr 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 2080.7% | 50,000 | 52,403 | 04 Mar 2026 | Direct | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -3.39% | -50,000 | 1,426,995 | 04 Mar 2026 | By Family Trust | ||
| Jonathan Klamkin | ALMU | Common Stock | Sale | -3.38% | $902,600 | $18.05 | -50,000 | 1,429,398 | 04 Mar 2026 | Direct |
| Steven Denbaars | ALMU | Common Stock | Sale | -3.14% | $198,094 | $15.85 | -12,500 | 385,088 | 26 Feb 2026 | Direct |
| Steven Denbaars | ALMU | Common Stock | Sale | -3.05% | $219,766 | $17.58 | -12,500 | 397,588 | 25 Feb 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.89% | $507,653 | $14.71 | -34,500 | 1,790,488 | 04 Feb 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -2.01% | $590,250 | $15.74 | -37,500 | 1,824,988 | 02 Feb 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.32% | $397,826 | $15.91 | -25,000 | 1,862,488 | 30 Jan 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.69% | $546,508 | $16.82 | -32,500 | 1,887,488 | 29 Jan 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.54% | $542,231 | $18.07 | -30,000 | 1,919,988 | 22 Jan 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -2.26% | $846,819 | $18.82 | -45,000 | 1,949,988 | 21 Jan 2026 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.48% | $620,617 | $20.69 | -30,000 | 1,994,988 | 20 Jan 2026 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 322% | 1,126,995 | 1,476,995 | 29 Dec 2025 | By Family Trust | ||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -99.8% | -1,126,995 | 2,403 | 29 Dec 2025 | Direct | ||
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.46% | $533,645 | $17.79 | -30,000 | 2,024,988 | 26 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -0.72% | $240,750 | $16.05 | -15,000 | 2,054,988 | 24 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -0.72% | $223,050 | $14.87 | -15,000 | 2,069,988 | 23 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.65% | $519,050 | $14.83 | -35,000 | 2,084,988 | 22 Dec 2025 | Direct |
| Jonathan Klamkin | ALMU | Common Stock | Gift | 350,000 | 350,000 | 19 Dec 2025 | By Family Trust | |||
| Jonathan Klamkin | ALMU | Common Stock | Gift | -23.7% | -350,000 | 1,129,398 | 19 Dec 2025 | Direct | ||
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.4% | $441,000 | $14.70 | -30,000 | 2,119,988 | 19 Dec 2025 | Direct |
* marks a reported price that did not pass the local price check.