ALT5 Sigma Corporation
ALT5 Sigma Corporation (ALTS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ALTS · as of Sep 30, 2025
Ownership Breakdown
104
Institutional Holders
▲ 71 vs Q2
$116.78M
Total Inst. Value
▲ $102.96M vs Q2
139.84M
Shares Outstanding
freeFloat 97.73%
43.41M
13F Shares Held
▲ 41.50M 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
ALTS largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
JANE STREET GROUP, LLC | 6.35M | 34.26% | 34.26% | $17.09B | Nov 14, 2025 | ▲ 6.30M |
VANGUARD GROUP INC | 6.13M | 33.03% | 33.03% | $16.48B | Nov 7, 2025 | ▲ 5.43M |
DIAMETRIC CAPITAL, LP | 3.54M | 19.10% | 19.10% | $9.53B | Nov 13, 2025 | NEW |
EXODUSPOINT CAPITAL MANAGEMENT, LP | 2.99M | 16.11% | 16.11% | $8.04B | Nov 14, 2025 | NEW |
SUSQUEHANNA INTERNATIONAL GROUP, LLP | 2.68M | 14.42% | 14.42% | $7.20B | Nov 14, 2025 | ▲ 2.57M |
CRCM LP | 2.31M | 12.46% | 12.46% | $6.22B | Nov 14, 2025 | NEW |
PRELUDE CAPITAL MANAGEMENT, LLC | 2.31M | 12.46% | 12.46% | $6.22B | Nov 14, 2025 | NEW |
NWI MANAGEMENT LP | 1.80M | 9.70% | 9.70% | $4.84B | Dec 5, 2025 | NEW |
ALYESKA INVESTMENT GROUP, L.P. | 1.75M | 9.41% | 9.41% | $4.70B | Nov 17, 2025 | NEW |
BLACKROCK, INC. | 1.57M | 8.49% | 8.49% | $4.24B | Nov 12, 2025 | ▲ 1.54M |
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
19
Increased
+22.95M shares29
New Positions
first time holders2
Decreased
−141.1K shares0
Sold Out
fully exitedNet shares change (top 50)
+22.81M
+22.95M / −141.1K
Net new holders
+46
29 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
ALTS insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
1
Sell transactions
1.00
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 |
|---|---|---|---|---|---|---|---|
DANZIGER DAVID C. director | Jul 2, 2025 | Award | 10,000 | $7.88 | $78.8K | 20.0K | Form 4 ↗ |
DANZIGER DAVID C. director | Aug 14, 2025 | Purchase | 10,000 | $7.30 | $73.0K | 20.0K | 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
ALT5 Sigma Corporation (ALTS) is primarily owned by institutional investors, who hold approximately 31.0% of total shares outstanding. Company insiders own approximately 2.27%, while retail and public investors account for the remaining 66.68%.
The largest institutional shareholder of ALT5 Sigma Corporation is JANE STREET GROUP, LLC, holding approximately 6.35 million shares — equal to 34.26% of outstanding shares — as of September 30, 2025.
A total of 104 institutional investors currently hold ALTS stock, with a combined institutional value of approximately $116,784,001 as of the most recent 13F filing period.
Frequently asked questions
ALTS ownershipALT5 Sigma Corporation (ALTS) is primarily owned by institutional investors, who hold approximately 31.0% of shares. The largest shareholder is JANE STREET GROUP, LLC with a 34.26% stake. Company insiders hold 2.27%. Data sourced from SEC Form 13F as of September 30, 2025.