System1, Inc. (SST) Ownership
SST ownership summary
as of October 18, 2026- Institutions
- 7.0% of shares outstanding
- Insiders
- 68.49% of shares outstanding
- Shares outstanding
- 8.7M
- Float
- 5.7M shares available to trade
- Short interest
- 9.70% 324K shares short
- Days to cover
- 0.25 short interest up 65.6% vs prior month
- Institutions 7.03%
- Insiders 68.49%
- Other investors 24.47%
SST top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Bank of America Corp | 1.85% | 162K | $339,177 | −6 (−0.0%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 1.46% | 128K | $267,910 | +90,444 (+243.6%) | June 30, 2026 |
| 3 | HPM Partners LLC | 1.34% | 117K | $245,372 | — | June 30, 2026 |
| 4 | Crescent Grove Advisors, LLC | 0.87% | 76K | $158,644 | +75,545 (0.0%) | June 30, 2026 |
| 5 | BlackRock Inc | 0.50% | 43K | $91,041 | +19,106 (+78.8%) | June 30, 2026 |
| 6 | Morgan Stanley - Brokerage Accounts | 0.15% | 13K | $27,581 | +13,134 (0.0%) | June 30, 2026 |
| 7 | Geode Capital Management, LLC | 0.14% | 13K | $26,290 | −11,320 (−47.5%) | June 30, 2026 |
| 8 | LEONTEQ SECURITIES AG | 0.14% | 12K | $26,250 | +12,500 (0.0%) | June 30, 2026 |
| 9 | T. Rowe Price Associates, Inc. | 0.13% | 12K | $24,635 | +11,731 (0.0%) | June 30, 2026 |
| 10 | State Street Corp | 0.13% | 12K | $24,154 | — | June 30, 2026 |
| 11 | Vanguard Fiduciary Trust Co | 0.10% | 9,141 | $19,196 | — | June 30, 2026 |
| 12 | Royal Bank of Canada | 0.02% | 1,314 | $2,759 | +1,314 (0.0%) | June 30, 2026 |
| 13 | UBS Group AG | 0.01% | 618 | $1,298 | −706 (−53.3%) | June 30, 2026 |
| 14 | JONES FINANCIAL COMPANIES LLLP | <0.01% | 366 | $769 | +366 (0.0%) | June 30, 2026 |
| 15 | CWM, LLC duplicate | <0.01% | 114 | $239 | +114 (0.0%) | March 31, 2026 |
| 16 | BNP Paribas Arbitrage, SA | <0.01% | 86 | $181 | — | June 30, 2026 |
| 17 | SBI Securities Co Ltd | <0.01% | 60 | $126 | — | June 30, 2026 |
| 18 | JPMorgan Chase & Co | <0.01% | 42 | $88 | −5,848 (−99.3%) | June 30, 2026 |
| 19 | Advisor Group Holdings, Inc. | <0.01% | 35 | $74 | — | June 30, 2026 |
| 20 | Group One Trading, LLC | <0.01% | 33 | $69 | −190 (−85.2%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 224K shares and 5 cut 18K.
SST top mutual fund and ETF holders
8 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 1.23% | 108K | $225,777 | — | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.13% | 11K | $23,917 | +5,630 (+97.8%) | August 31, 2026 |
| 3 | iShares Micro-Cap ETF | 0.11% | 9,249 | $19,423 | −64 (−0.7%) | September 30, 2026 |
| 4 | EA Bridgeway Ultra-Small Company Mkt ETF | 0.08% | 7,002 | $14,704 | — | September 30, 2026 |
| 5 | Fidelity Total Market Index | 0.04% | 3,635 | $7,634 | — | August 31, 2026 |
| 6 | Fidelity Series Total Market Index | 0.02% | 1,725 | $3,622 | — | August 31, 2026 |
| 7 | 1290 VT Micro Cap K | 0.01% | 1,203 | $2,526 | — | August 31, 2026 |
| 8 | Knights of Columbus U.S. All Cap Idx I | <0.01% | 22 | $46 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
SST insider transactions
latest 6| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-15 | Tridivesh Kidambi | Buy | $3.00 | 26,910 | $80,730 |
| 2025-08-22 | Cee Holdings Trust | Buy | $7.32 | 11,015 | $80,630 |
| 2025-08-20 | Cee Holdings Trust | Buy | $6.25 | 12,584 | $78,650 |
| 2025-08-19 | Cee Holdings Trust | Buy | $6.32 | 6,567 | $41,503 |
| 2025-06-13 | John Civantos | Buy | $4.01 | 6,158 | $24,694 |
| 2025-06-12 | John Civantos | Buy | $3.89 | 18,842 | $73,295 |
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.
SST shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns SST
Institutional investors own 7.0% of System1's shares and insiders 68.49%. The largest holder is Bank of America Corp with 1.85% of the shares (162K), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 5 reduced their stake in the latest filings. Short interest is 9.70% of the float, or 0.25 days of average trading volume. The share count fell 90.1% since 2020.
Related: SST analyst forecast, SST key metrics. See the SST stock overview for the latest quote and news.
SST ownership FAQ
Who owns the most System1 stock?
The largest shareholders of System1 are Bank of America Corp (1.85%), Vanguard Capital Management, LLC (1.46%), HPM Partners LLC (1.34%), Crescent Grove Advisors, LLC (0.87%), BlackRock Inc (0.50%).
What percentage of System1 is owned by institutions?
Institutions hold 7.0% of System1's shares outstanding; insiders hold 68.49%.
Which funds own System1?
The largest fund holders of System1 are Vanguard MStar Total Stk Mkt Idx Invest (1.23%), Fidelity Extended Market Index (0.13%), iShares Micro-Cap ETF (0.11%), EA Bridgeway Ultra-Small Company Mkt ETF (0.08%), Fidelity Total Market Index (0.04%).
What is System1's short interest?
324K shares of System1 were sold short, 9.70% of the float; at the average daily volume it would take 0.25 days to cover.
Are insiders buying or selling System1?
Of the latest 6 reported insider transactions in System1 (since June 12, 2025), 6 were purchases and 0 were sales.
How many shares of System1 are outstanding?
System1 has 8.7M shares outstanding, of which 5.7M are in the public float.