Aeluma, Inc.
Aeluma, Inc. (ALMU) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ALMU · as of Sep 30, 2025
Ownership Breakdown
70
Institutional Holders
▲ 22 vs Q2
$58.50M
Total Inst. Value
▲ $24.66M vs Q2
14.17M
Shares Outstanding
freeFloat 69.90%
3.61M
13F Shares Held
▲ 1.54M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ALMU largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. semiconductors & related devices | 721.4K | 5.78% | 5.78% | $11.61B | Nov 12, 2025 | ▲ 204.8K |
VANGUARD GROUP INC semiconductors & related devices | 439.0K | 3.52% | 3.52% | $7.07B | Nov 7, 2025 | ▲ 217.4K |
APIS CAPITAL ADVISORS, LLC semiconductors & related devices | 253.5K | 2.03% | 2.03% | $4.08B | Nov 14, 2025 | ▲ 11.5K |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 233.2K | 1.87% | 1.87% | $3.75B | Nov 12, 2025 | ▼ 2.0K |
POLAR ASSET MANAGEMENT PARTNERS INC. semiconductors & related devices | 211.1K | 1.69% | 1.69% | $3.40B | Dec 1, 2025 | NEW |
MILLENNIUM MANAGEMENT LLC semiconductors & related devices | 210.7K | 1.69% | 1.69% | $3.39B | Nov 14, 2025 | NEW |
AWM INVESTMENT COMPANY, INC. semiconductors & related devices | 200.0K | 1.60% | 1.60% | $3.22B | Nov 13, 2025 | ▲ 200.0K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP semiconductors & related devices | 167.2K | 1.34% | 1.34% | $2.69B | Nov 14, 2025 | ▲ 155.7K |
STATE STREET CORP semiconductors & related devices | 159.2K | 1.28% | 1.28% | $2.56B | Nov 14, 2025 | ▲ 52.7K |
THOMPSON SIEGEL & WALMSLEY LLC semiconductors & related devices | 150.0K | 1.20% | 1.20% | $2.42B | Nov 12, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
15
Increased
+862.6K shares18
New Positions
first time holders11
Decreased
−79.0K shares0
Sold Out
fully exitedNet shares change (top 50)
+783.6K
+862.6K / −79.0K
Net new holders
+22
18 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ALMU insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
10
Sell transactions
0.10
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Denbaars Steven director | May 19, 2026 | Sale | 7,415 | $19.56 | $145.0K | 387.8K | Form 4 ↗ |
Denbaars Steven director | May 19, 2026 | Sale | 5,085 | $20.61 | $104.8K | 382.7K | Form 4 ↗ |
Denbaars Steven director | May 20, 2026 | Sale | 11,558 | $20.40 | $235.7K | 371.2K | Form 4 ↗ |
Denbaars Steven director | May 20, 2026 | Sale | 942 | $21.30 | $20.1K | 370.2K | Form 4 ↗ |
Klamkin Jonathan Chief Executive Officer | Dec 29, 2025 | Gift | 1,126,995 | — | — | 1.48M | Form 4 ↗ |
Klamkin Jonathan Chief Executive Officer | Mar 4, 2026 | Gift | 50,000 | — | — | 1.43M | Form 4 ↗ |
Klamkin Jonathan Chief Executive Officer | Apr 1, 2026 | Gift | 20,000 | — | — | 1.41M | Form 4 ↗ |
Klamkin Jonathan Chief Executive Officer | May 1, 2026 | Gift | 20,000 | — | — | 1.39M | Form 4 ↗ |
Klamkin Jonathan Chief Executive Officer | Dec 19, 2025 | Gift | 350,000 | — | — | 1.13M | Form 4 ↗ |
Klamkin Jonathan Chief Executive Officer | Dec 19, 2025 | Gift | 350,000 | — | — | 350.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Aeluma, Inc. (ALMU) is primarily owned by institutional investors, who hold approximately 25.5% of total shares outstanding. Company insiders own approximately 30.10%, while retail and public investors account for the remaining 44.42%.
The largest institutional shareholder of Aeluma, Inc. is BLACKROCK, INC., holding approximately 721,423 shares — equal to 5.78% of outstanding shares — as of September 30, 2025.
A total of 70 institutional investors currently hold ALMU stock, with a combined institutional value of approximately $58,503,391 as of the most recent 13F filing period.
Frequently asked questions
ALMU ownershipAeluma, Inc. (ALMU) is primarily owned by institutional investors, who hold approximately 25.5% of shares. The largest shareholder is BLACKROCK, INC. with a 5.78% stake. Company insiders hold 30.10%. Data sourced from SEC Form 13F as of September 30, 2025.