Aeluma, Inc (ALMU) Ownership
ALMU ownership summary
as of October 17, 2026- Institutions
- 29.5% of shares outstanding
- Insiders
- 22.30% of shares outstanding
- Shares outstanding
- 19.3M
- Float
- 14.8M shares available to trade
- Short interest
- 25.91% 3.7M shares short
- Days to cover
- 6.01 short interest up 2.8% vs prior month
- Institutions 29.54%
- Insiders 22.30%
- Other investors 48.16%
ALMU top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 5.04% | 973K | $7.7M | +113,528 (+13.2%) | June 30, 2026 |
| 2 | D. E. Shaw & Co LP | 4.13% | 798K | $6.3M | +772,983 (+3,091.9%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 2.97% | 574K | $4.6M | −14,334 (−2.4%) | June 30, 2026 |
| 4 | Millennium Management LLC | 2.74% | 529K | $4.2M | +130,706 (+32.8%) | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 1.65% | 318K | $2.5M | +22,696 (+7.7%) | June 30, 2026 |
| 6 | State Street Corp | 1.32% | 254K | $2.0M | +6,823 (+2.8%) | June 30, 2026 |
| 7 | Apis Capital Advisors, LLC | 1.00% | 194K | $1.5M | −12,000 (−5.8%) | June 30, 2026 |
| 8 | Awm Investment Company Inc | 0.68% | 131K | $1.0M | −68,596 (−34.3%) | June 30, 2026 |
| 9 | Northern Trust Corp | 0.64% | 124K | $981,865 | +7,582 (+6.5%) | June 30, 2026 |
| 10 | Vanguard Portfolio Management, LLC | 0.58% | 112K | $893,580 | −7,481 (−6.2%) | June 30, 2026 |
| 11 | Marshall Wace Asset Management Ltd | 0.50% | 96K | $762,914 | −53,473 (−35.8%) | June 30, 2026 |
| 12 | Bank of New York Mellon Corp | 0.48% | 93K | $736,941 | +64,397 (+227.6%) | June 30, 2026 |
| 13 | Lazard Asset Management LLC | 0.47% | 91K | $720,159 | +90,586 (0.0%) | June 30, 2026 |
| 14 | Vanguard Fiduciary Trust Co | 0.44% | 84K | $669,191 | +11,199 (+15.3%) | June 30, 2026 |
| 15 | Westside Investment Management, Inc. | 0.27% | 53K | $417,971 | −10,255 (−16.3%) | June 30, 2026 |
| 16 | Wedbush Morgan Securities Inc | 0.27% | 51K | $408,829 | +51,425 (0.0%) | June 30, 2026 |
| 17 | UBS Group AG | 0.24% | 47K | $374,270 | −73,932 (−61.1%) | June 30, 2026 |
| 18 | Citadel Advisors Llc | 0.21% | 41K | $327,691 | +41,219 (0.0%) | June 30, 2026 |
| 19 | Morgan Stanley - Brokerage Accounts | 0.21% | 41K | $327,182 | −1,710 (−4.0%) | June 30, 2026 |
| 20 | LPL Financial Corp | 0.20% | 39K | $309,080 | +12,584 (+47.9%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 1.3M shares and 8 cut 242K.
ALMU top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.22% | 428K | $3.4M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.06% | 399K | $3.2M | −4,608 (−1.1%) | September 30, 2026 |
| 3 | iShares Russell 2000 Growth ETF | 0.76% | 146K | $1.2M | −185 (−0.1%) | September 30, 2026 |
| 4 | Fidelity Small Cap Index | 0.73% | 141K | $1.1M | +828 (+0.6%) | July 31, 2026 |
| 5 | WisdomTree Quantum Computing ETF USD Acc | 0.67% | 130K | $1.0M | +1,777 (+1.4%) | September 30, 2026 |
| 6 | WisdomTree Quantum Computing Fund | 0.46% | 89K | $708,711 | +812 (+0.9%) | September 30, 2026 |
| 7 | Bridge Builder Tax Managed Sm/Md Cp | 0.41% | 80K | $634,132 | +79,765 (0.0%) | September 30, 2026 |
| 8 | Lazard Baylight US Sm Cap Eq WW Dist EUR | 0.39% | 75K | $598,047 | +75,226 (0.0%) | June 30, 2026 |
| 9 | Vanguard Russell 2000 ETF | 0.38% | 74K | $590,431 | +1,440 (+2.0%) | August 31, 2026 |
| 10 | Fidelity Extended Market Index | 0.31% | 60K | $473,860 | +4,217 (+7.6%) | August 31, 2026 |
| 11 | iShares Micro-Cap ETF | 0.26% | 49K | $392,364 | −340 (−0.7%) | September 30, 2026 |
| 12 | Fidelity Nasdaq Composite Index | 0.19% | 36K | $285,747 | +25,211 (+234.9%) | August 31, 2026 |
| 13 | Schwab Small Cap Index | 0.16% | 31K | $243,962 | — | August 31, 2026 |
| 14 | iShares Russell 2000 Small-Cap Idx Instl | 0.12% | 23K | $182,007 | — | August 31, 2026 |
| 15 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.12% | 23K | $181,991 | +1,088 (+5.0%) | August 31, 2026 |
| 16 | Vanguard US Momentum Factor ETF | 0.12% | 23K | $180,465 | −21,720 (−48.9%) | June 30, 2026 |
| 17 | AQR Delphi L/S Eq IAU1F | 0.11% | 22K | $171,919 | −21,625 (−50.0%) | March 31, 2026 |
| 18 | Fidelity Total Market Index | 0.11% | 21K | $170,830 | +757 (+3.7%) | August 31, 2026 |
| 19 | BSF Systematic US Eq Abs Ret A2 USD | 0.10% | 19K | $152,640 | — | December 31, 2025 |
| 20 | Fidelity Series Total Market Index | 0.10% | 19K | $148,681 | +1,440 (+8.3%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ALMU insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-01 | Jonathan Klamkin | Sell | $13.10 | 20,000 | $262,000 |
| 2026-03-04 | Jonathan Klamkin | Sell | $18.05 | 50,000 | $902,500 |
| 2026-02-25 | Steven Denbaars | Sell | $17.58 | 12,500 | $219,750 |
| 2026-02-04 | Mark N Tompkins | Sell | $14.71 | 34,500 | $507,495 |
| 2026-02-02 | Mark N Tompkins | Sell | $15.74 | 37,500 | $590,250 |
| 2026-01-30 | Mark N Tompkins | Sell | $15.91 | 25,000 | $397,750 |
| 2026-01-29 | Mark N Tompkins | Sell | $16.82 | 32,500 | $546,650 |
| 2026-01-22 | Mark N Tompkins | Sell | $18.07 | 30,000 | $542,100 |
| 2026-01-21 | Mark N Tompkins | Sell | $18.82 | 45,000 | $846,900 |
| 2026-01-20 | Mark N Tompkins | Sell | $20.69 | 30,000 | $620,700 |
| 2025-12-26 | Mark N Tompkins | Sell | $17.79 | 30,000 | $533,700 |
| 2025-12-23 | Mark N Tompkins | Sell | $14.87 | 15,000 | $223,050 |
| 2025-12-22 | Mark N Tompkins | Sell | $14.83 | 35,000 | $519,050 |
| 2025-12-19 | Mark N Tompkins | Sell | $14.70 | 30,000 | $441,000 |
| 2025-12-18 | Mark N Tompkins | Sell | $14.37 | 20,000 | $287,400 |
| 2025-12-10 | Mark N Tompkins | Sell | $17.49 | 20,000 | $349,800 |
| 2025-12-09 | Mark N Tompkins | Sell | $16.82 | 30,000 | $504,600 |
| 2025-12-08 | Mark N Tompkins | Sell | $16.06 | 40,000 | $642,400 |
| 2025-12-04 | Mark N Tompkins | Sell | $16.03 | 30,000 | $480,900 |
| 2025-10-20 | Mark N Tompkins | Sell | $16.39 | 37,500 | $614,625 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ALMU shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ALMU
Institutional investors own 29.5% of Aeluma's shares and insiders 22.30%. The largest holder is BlackRock Inc with 5.04% of the shares (973K), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 25.91% of the float, or 6.01 days of average trading volume. The share count rose 67.8% since 2020.
Related: ALMU analyst forecast, ALMU key metrics. See the ALMU stock overview for the latest quote and news.
ALMU ownership FAQ
Who owns the most Aeluma stock?
The largest shareholders of Aeluma are BlackRock Inc (5.04%), D. E. Shaw & Co LP (4.13%), Vanguard Capital Management, LLC (2.97%), Millennium Management LLC (2.74%), Geode Capital Management, LLC (1.65%).
What percentage of Aeluma is owned by institutions?
Institutions hold 29.5% of Aeluma's shares outstanding; insiders hold 22.30%.
Which funds own Aeluma?
The largest fund holders of Aeluma are Vanguard MStar Total Stk Mkt Idx Invest (2.22%), iShares Russell 2000 ETF (2.06%), iShares Russell 2000 Growth ETF (0.76%), Fidelity Small Cap Index (0.73%), WisdomTree Quantum Computing ETF USD Acc (0.67%).
What is Aeluma's short interest?
3.7M shares of Aeluma were sold short, 25.91% of the float; at the average daily volume it would take 6.01 days to cover.
Are insiders buying or selling Aeluma?
Of the latest 20 reported insider transactions in Aeluma (since October 20, 2025), 0 were purchases and 20 were sales.
How many shares of Aeluma are outstanding?
Aeluma has 19.3M shares outstanding, of which 14.8M are in the public float.