Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in SST held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Cannae Holdings, Inc. | 357K | $1.1M | 0.0% | 3.581% | 4.39% |
| 2 | BANK OF AMERICA CORP /DE/ | 162K | $488K | -0.0% | 1.621% | 0.00% |
| 3 | Cerity Partners LLC | 117K | $353K | 0.0% | 1.173% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 37K | $112K | β | 0.373% | 0.00% |
| 5 | MILLENNIUM MANAGEMENT LLC | 33K | $99K | -8.0% | 0.327% | 0.00% |
| 6 | BlackRock, Inc. | 24K | $73K | 0.0% | 0.243% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 24K | $72K | +66.0% | 0.239% | 0.00% |
| 8 | NINE MASTS CAPITAL Ltd | 19K | $56K | β | 0.186% | 0.01% |
| 9 | RENAISSANCE TECHNOLOGIES LLC | 18K | $55K | -1.6% | 0.184% | 0.00% |
| 10 | STATE STREET CORP | 12K | $35K | 0.0% | 0.115% | 0.00% |
| 11 | VANGUARD FIDUCIARY TRUST CO | 9K | $28K | β | 0.092% | 0.00% |
| 12 | Tower Research Capital LLC (TRC) | 7K | $22K | +642.1% | 0.074% | 0.00% |
| 13 | UBS Group AG | 1K | $4K | +217.5% | 0.013% | 0.00% |
| 14 | Vanguard Global Advisers, LLC | 660 | $2K | β | 0.007% | 0.00% |
| 15 | UMA Financial Services, Inc. | 301 | $910 | β | 0.003% | 0.00% |
| 16 | Farther Finance Advisors, LLC | 150 | $783 | 0.0% | 0.002% | 0.00% |
| 17 | GROUP ONE TRADING, L.P. | 223 | $673 | -66.4% | 0.002% | 0.00% |
| 18 | Strategic Wealth Partners, Ltd. | 100 | $392 | β | 0.001% | 0.00% |
| 19 | CWM, LLC | 114 | $344 | -0.9% | 0.001% | 0.00% |
| 20 | SHP Wealth Management | 100 | $302 | β | 0.001% | 0.00% |
| 21 | BNP PARIBAS ARBITRAGE, SA | 86 | $260 | 0.0% | 0.001% | 0.00% |
| 22 | SBI Securities Co., Ltd. | 60 | $181 | 0.0% | 0.001% | 0.00% |
| 23 | ADVISOR GROUP HOLDINGS, INC. | 35 | $105 | 0.0% | 0.000% | 0.00% |
| 24 | ROYAL BANK OF CANADA | 39 | $0 | -63.9% | 0.000% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in SST β a direct measure of their conviction.
Filings activity in SST during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 24 | +4.3% | 8.35% | 2.41 pp | $2M | 22% |
| Q4 2025 | 23 | 26% | 10.76% | 65.07 pp | $3M | 86% |
| Q3 2025 | 31 | 14% | 75.83% | +15.68 pp | $23M | +26% |
| Q2 2025 | 36 | 36% | 60.15% | +15.98 pp | $18M | +36% |
| Q1 2025 | 56 | 5.1% | 44.17% | 62.28 pp | $13M | 59% |
| Q4 2024 | 59 | 1.7% | 106.45% | 24.94 pp | $32M | 19% |
| Q3 2024 | 60 | 1.6% | 131.39% | 47.25 pp | $39M | 26% |
| Q2 2024 | 61 | β | 178.64% | β | $53M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying SST stock.
Based on Q1 2026 13F filings, institutional ownership of System1, Inc. stands at 8.3%, held across 24 reporting institutions.
Cannae Holdings, Inc. is the largest reported institutional holder of SST, with approximately 356,797 shares worth $0.00B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of SST, including MILLENNIUM MANAGEMENT LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for SST is 46 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
7 institutions opened new positions in SST during Q1 2026, while 6 fully exited. 4 added to existing positions and 11 trimmed.
SST institutional ownership fell by 2.41 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 97.6% of all reported 13F value in SST, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
System1, Inc. (SST) Institutional Ownership