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
31 Mar 2026
- Symbol
- ALMU on Nasdaq
- SEC evidence covered
- 13D/G, 3/4/5, and 13F
- Largest SEC-reported holder
- Perry George Herbert
- Latest 13D/G holder
- Perry George Herbert
- Latest parsed evidence date
- 31 Mar 2026
- CIK
- 0001828805
- Location
- Goleta, CA
Ownership snapshot
2 signals
Issuer
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
31 Mar 2026
13D/G
3/4/5
13F
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.
Comparable ownership
Top 5
Perry George Herbert
5.6%
Mark N. Tompkins
4.8%
AWM Investment Company, Inc.
2.6%
Lee McCarthy
1.5%
BlackRock, Inc.
4.7%
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 |
| Mark N. Tompkins |
3/4/5
13D/G
Former 10% Owner
|
4.8%
from 13D/G
|
$28,725,311
1,824,988 shares
|
-$17,997,456 | 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 |
| BlackRock, Inc. |
13F
Company
|
4.7%
|
$11,253,565
859,707 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
3.2%
|
$7,706,751
588,751 shares
|
— | 31 Mar 2026 |
| MILLENNIUM MANAGEMENT LLC |
13F
Company
|
2.2%
|
$5,213,734
398,299 shares
|
— | 31 Mar 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
1.6%
|
$3,867,018
295,322 shares
|
— | 31 Mar 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: -$23,412,073.
Buys
$0
Insiders: 0
Sells
$23,412,073
Insiders: 3
Net
-$23,412,073
Shares: -1,339,645
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,339,645
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 115,000 | $0 | $2,169,452 | -$2,169,452 |
| 3-6 | 0 | 554,500 | $0 | $9,176,578 | -$9,176,578 |
| 6-9 | 0 | 520,145 | $0 | $9,238,738 | -$9,238,738 |
| 9-12 | 0 | 150,000 | $0 | $2,827,305 | -$2,827,305 |
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
-$23,412,073
Latest report
19 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mark N. Tompkins | Former 10% Owner | $28,725,311 | -$17,997,456 | -39% | Filing P/S | 04 Feb 2026 |
| Jonathan Klamkin | Chief Executive Officer, Director | $23,558,312 | -$4,491,127 | -16% | Mixed | 01 Apr 2026 |
| Lee McCarthy | 10%+ Owner | $12,344,877 | Mixed | 22 Jun 2021 | ||
| Steven DenBaars | Director | $8,883,065 | -$923,490 | -9.4% | Mixed | 19 May 2026 |
| John Kenneth Paglia | Director | $2,118,153 | Mixed | 03 Dec 2025 | ||
| Craig H. Ensley | Director | $1,574,149 | Mixed | 03 Dec 2025 | ||
| Ian Seth Jacobs | Former Director and Officer | $600,000 | Mixed | 22 Jun 2021 | ||
| Michael Byron | Director | $274,198 | Mixed | 03 Dec 2025 | ||
| Palvi Kumar Mehta | Director | Mixed | 15 Nov 2021 | |||
| Christopher P. Stewart | Chief Financial Officer | Mixed | 04 Aug 2025 | |||
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -0.92% | $287,400 | $14.37 | -20,000 | 2,149,988 | 18 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -0.91% | $349,800 | $17.49 | -20,000 | 2,169,988 | 10 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.35% | $504,523 | $16.82 | -30,000 | 2,189,988 | 09 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.77% | $642,420 | $16.06 | -40,000 | 2,219,988 | 08 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.31% | $484,196 | $16.14 | -30,000 | 2,259,988 | 05 Dec 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.29% | $480,980 | $16.03 | -30,000 | 2,289,988 | 04 Dec 2025 | Direct |
| Craig H. Ensley | ALMU | Common Stock | Award | 63.8% | 10,633 | 27,300 | 03 Dec 2025 | Direct | ||
| John Kenneth Paglia | ALMU | Common Stock | Award | 86.9% | 10,861 | 23,361 | 03 Dec 2025 | Direct | ||
| Michael Byron | ALMU | Common Stock | Award | 13,343 | 13,343 | 03 Dec 2025 | Direct | |||
| Steven Denbaars | ALMU | Common Stock | Award | 2.63% | 10,121 | 395,209 | 03 Dec 2025 | Direct | ||
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.59% | $614,625 | $16.39 | -37,500 | 2,319,988 | 20 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.67% | $677,294 | $16.93 | -40,000 | 2,357,488 | 17 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.03% | $482,251 | $19.29 | -25,000 | 2,397,488 | 16 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.62% | $823,424 | $20.59 | -40,000 | 2,422,488 | 15 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.47% | $731,940 | $19.86 | -36,855 | 2,462,488 | 14 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.39% | $599,747 | $16.98 | -35,331 | 2,499,343 | 13 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.36% | $583,471 | $16.67 | -35,000 | 2,534,674 | 10 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.42% | $611,168 | $16.56 | -36,908 | 2,569,674 | 09 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.32% | $611,576 | $17.47 | -35,000 | 2,606,582 | 08 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -1.31% | $621,268 | $17.75 | -35,000 | 2,641,582 | 07 Oct 2025 | Direct |
| Mark N. Tompkins | ALMU | Common Stock | Sale | -2.32% | $1,189,395 | $18.70 | -63,604 | 2,676,582 | 06 Oct 2025 | Direct |
* marks a reported price that did not pass the local price check.