Aeluma, Inc
Ownership
Ownership Structure
Who owns Aeluma, Inc (ALMU)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 76.6% of the shares are freely tradable; institutional investors hold 27.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 5.04 | 973,235 | +13.2 | 06/30/2026 |
| D. E. Shaw & Co LP | 4.13 | 797,983 | +3,091.9 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.97 | 574,417 | -2.4 | 06/30/2026 |
| Millennium Management LLC | 2.74 | 529,005 | +32.8 | 06/30/2026 |
| Geode Capital Management, LLC | 1.65 | 318,018 | +7.7 | 06/30/2026 |
| State Street Corp | 1.32 | 254,168 | +2.8 | 06/30/2026 |
| Apis Capital Advisors, LLC | 1.00 | 194,000 | -5.8 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.22 | 428,381 | +0.0 | 09/30/2026 |
| iShares Russell 2000 ETF | 2.06 | 398,528 | -1.1 | 09/30/2026 |
| iShares Russell 2000 Growth ETF | 0.76 | 146,355 | -0.1 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Klamkin Jonathan | Chief Executive Officer | 1,169,297 | 8,769,728 $ | Sep 21, 2026 | both |
| Denbaars Steven | Director | 345,209 | 2,589,068 $ | Aug 27, 2026 | direct |
| Stewart Christopher P. | Chief Financial Officer | 67,781 | 508,358 $ | Sep 30, 2026 | direct |
| Byron Michael | Director | 38,343 | 287,573 $ | Sep 21, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 12, 2026 | Klamkin Jonathan | Chief Executive Officer | Sell | 100,000 | 10.53 | 1,053,430 |
| Sep 30, 2026 | Stewart Christopher P. | Chief Financial Officer | Other | 5,697 | 12.36 | 70,415 |
| Sep 21, 2026 | Klamkin Jonathan | Chief Executive Officer | Other | 4,547 | 13.61 | 61,885 |
| Sep 21, 2026 | Klamkin Jonathan | Chief Executive Officer | Other | 12,675 | 0.00 | – |
| Sep 21, 2026 | Klamkin Jonathan | Chief Executive Officer | Other | 31,771 | 0.00 | – |
| Sep 21, 2026 | Klamkin Jonathan | Chief Executive Officer | Sell | 100,000 | 13.35 | 1,335,320 |
| Sep 21, 2026 | Stewart Christopher P. | Chief Financial Officer | Other | 1,450 | 13.61 | 19,735 |
| Sep 21, 2026 | Stewart Christopher P. | Chief Financial Officer | Other | 4,042 | 0.00 | – |
| Sep 21, 2026 | Stewart Christopher P. | Chief Financial Officer | Other | 15,886 | 0.00 | – |
| Sep 21, 2026 | Byron Michael | Director | Other | 25,000 | 5.93 | 148,250 |
| Aug 27, 2026 | Denbaars Steven | Director | Sell | 12,500 | 13.82 | 172,698 |
| Aug 26, 2026 | Denbaars Steven | Director | Sell | 12,500 | 13.84 | 173,044 |
| Aug 3, 2026 | Klamkin Jonathan | Chief Executive Officer | Sell | 15,810 | 16.85 | 266,378 |
| Aug 3, 2026 | Klamkin Jonathan | Chief Executive Officer | Sell | 4,190 | 16.29 | 68,263 |
| Aug 3, 2026 | Klamkin Jonathan | Chief Executive Officer | Other | 20,000 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.