SST
System1, Inc.Company with tickers: SST, SSTPW
CIK
1805833
CUSIP
87200P208
Shares Outstanding
8,150,474
13F Activity (30d)
25 filings
23 filers
Holders: 25
Total Value: $2,497,290
Total Shares: 826,922
Institutional Ownership Trend
Holder Concentration
Across 25 13F filers · Δ vs Dec 31, 2025Top Holder
43.1%
−0.6 pts
Top 5
85.2%
−2.7 pts
Top 10
96.9%
−1.2 pts
HHI
2,510
Highly concentrated
−76
Quarterly Activity
vs Dec 31, 2025
New
6
Increased
4
Decreased
6
Sold Out
5
Unchanged
9
Holder count:
+1
Institutional value:
-21.9%
Shares held:
+1.4%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +9,476 | 23,839 | |
| Mid Tower Research Capital LLC (TRC) | +6,344 | 7,332 | |
| Mega JPMORGAN CHASE & CO | +5,848 | 5,890 | |
| Mega UBS Group AG | +907 | 1,324 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega MILLENNIUM MANAGEMENT LLC | −2,830 | 32,619 | |
| Mid GROUP ONE TRADING LLC | −440 | 223 | |
| Large RENAISSANCE TECHNOLOGIES LLC | −300 | 18,320 | |
| Mega ROYAL BANK OF CANADA | −69 | 39 | |
| Mega BANK OF AMERICA CORP /DE/ | −27 | 161,519 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 37,132 | $112,138 | |
| Mid NINE MASTS CAPITAL Ltd | 18,548 | $56,014 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 9,141 | $27,605 | |
| Mega Vanguard Global Advisers, LLC | 660 | $1,993 | |
| Small Physician Wealth Advisors, Inc. | 301 | $909 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 46,933 | $183,976 | |
| Mega CITADEL ADVISORS LLC | 12,759 | $50,015 | |
| Mid XTX Topco Ltd | 12,376 | $48,513 | |
| Mega FMR LLC | 1,105 | $4,331 | |
| Mega MORGAN STANLEY | 439 | $1,720 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Micro Cannae Holdings, Inc. | $1,077,526 | 43.15% | 356,797 | Shares | Sole | 2026-04-15 | ||||
| Mega BANK OF AMERICA CORP /DE/ Bank | $487,787 | 19.53% | 161,519 | Shares | Defined | 2026-05-18 | ||||
| Large Cerity Partners LLC | $352,868 | 14.13% | 116,844 | Shares | Sole | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $112,138 | 4.49% | 37,132 | Shares | Defined | 2026-05-15 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $98,509 | 3.94% | 32,619 | Shares | Sole | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $73,225 | 2.93% | 24,247 | Shares | Sole | 2026-05-13 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $71,993 | 2.88% | 23,839 | Shares | Defined | 2026-05-15 | ||||
| Mid NINE MASTS CAPITAL Ltd | $56,014 | 2.24% | 18,548 | Shares | Sole | 2026-05-13 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $55,326 | 2.22% | 18,320 | Shares | Sole | 2026-05-14 | ||||
| Mega STATE STREET CORP | $34,736 | 1.39% | 11,502 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $27,605 | 1.11% | 9,141 | Shares | Defined | 2026-05-08 | ||||
| Mid Tower Research Capital LLC (TRC) | $22,142 | 0.89% | 7,332 | Shares | Defined | 2026-05-15 | ||||
| Mega JPMORGAN CHASE & CO | $17,786 | 0.71% | 5,890 | Shares | Defined | 2026-05-13 | ||||
| Mega UBS Group AG | $3,997 | 0.16% | 1,324 | Shares | Defined | 2026-05-05 | ||||
| Mega Vanguard Global Advisers, LLC | $1,993 | 0.08% | 660 | Shares | Defined | 2026-05-08 | ||||
| Small Physician Wealth Advisors, Inc. | $909 | 0.04% | 301 | Shares | Sole | 2026-04-24 | ||||
| Mid GROUP ONE TRADING LLC | $673 | 0.03% | 223 | Shares | Sole | 2026-05-13 | ||||
| Mid Farther Finance Advisors, LLC | $453 | 0.02% | 150 | Shares | Sole | 2026-04-07 | ||||
| Large CWM, LLC | $344 | 0.01% | 114 | Shares | Sole | 2026-05-14 | ||||
| Small Strategic Wealth Partners, Ltd. | $302 | 0.01% | 100 | Shares | Sole | 2026-05-12 | ||||
| Small SHP Wealth Management | $302 | 0.01% | 100 | Shares | Sole | 2026-05-08 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $259 | 0.01% | 86 | Shares | Defined | 2026-05-12 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $181 | 0.01% | 60 | Shares | Defined | 2026-04-28 | ||||
| Mega ROYAL BANK OF CANADA Bank | $117 | 0.00% | 39 | Shares | Defined | 2026-05-15 | ||||
| Large OSAIC HOLDINGS, INC. | $105 | 0.00% | 35 | Shares | Defined | 2026-05-15 | ||||
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