System1
25 hedge funds and large institutions have $2.5M invested in System1 in 2026 Q1 according to their latest regulatory filings, with 6 funds opening new positions, 4 increasing their positions, 6 reducing their positions, and 4 closing their positions.
50% more first-time investments, than exits
New positions opened: 6 | Existing positions closed: 4
4% more funds holding
Funds holding: 24 → 25 (+1)
0.19% more ownership
Funds ownership: 10.04% → 10.23% (+0.19%)
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
22% less capital invested
Capital invested by funds: $3.2M → $2.5M (-$699K)
33% less repeat investments, than reductions
Existing positions increased: 4 | Existing positions reduced: 6
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
NMC
Nine Masts Capital
Central,
Hong Kong
|
+$62.4K |
| 2 |
Geode Capital Management
Boston,
Massachusetts
|
+$31.9K |
| 3 |
TRCT
Tower Research Capital (TRC)
New York
|
+$21.3K |
| 4 |
JP Morgan Chase
New York
|
+$19.7K |
| 5 |
UBS Group
Zurich,
Switzerland
|
+$3.05K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$50K |
| 2 |
XT
XTX Topco
George Town,
Cayman Islands
|
-$48.5K |
| 3 |
Millennium Management
New York
|
-$9.52K |
| 4 |
Fidelity Investments
Boston,
Massachusetts
|
-$4.33K |
| 5 |
Morgan Stanley
New York
|
-$1.72K |
SST Hedge Fund Activity: Q1 2026 in Review
25 of the 8,127 institutional investors tracked by Wall St. Rank reported a position in System1 (SST) for Q1 2026, worth a combined $2.5M — down 22% from $3.2M a quarter earlier.
Buyers outnumbered sellers: 6 funds opened new SST positions and 4 closed out — a net gain of 2 holders — while 4 added to existing stakes and 6 trimmed.
The largest buyer was Nine Masts Capital, opening a new position worth an estimated $62.4K. The largest seller was Citadel Advisors, exiting entirely with an estimated $50K sold.
- 25 institutional investors held System1 (SST) as of Q1 2026, up from 24 in Q4 2025.
- Funds reported $2.5M of System1 stock for Q1 2026, down 22% quarter-over-quarter.
- 6 funds opened new System1 positions in Q1 2026 and 4 closed out, a net change of +2 holders.
- The largest System1 buyer in Q1 2026 was Nine Masts Capital, an estimated $62.4K added.
- The largest System1 seller in Q1 2026 was Citadel Advisors, an estimated $50K sold.
Based on aggregated 13F filings for Q1 2026.