Ticker · CUSIP 87200P208

SST

SYSTEM1 INC

···Share

Holders (tracked)

Combined shares

66,828

Combined value

$262.0K

Last close

$2.15

Quarter

2025Q4

Price is -45.2% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$2.15-0.93 (-30.19%)H $10.76 · L $1.37 · Avg Vol 595K

Position opened

Tracked holders · last 8 quarters

Flat over the last 3 quarters.

SEC event timeline

5 events

Ken Griffin (Citadel Advisors) added2026-02-17
+2,703 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−3,112 shares · 2025Q4
Position
Renaissance Technologies added2026-02-12
+1,500 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2025-11-14
−4,217 shares · 2025Q3
Position
Renaissance Technologies added2025-11-13
+5,100 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for SST →

Follow-the-investor returns

If you'd copied each holder of SST…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Izzy Englander (Millennium Mgmt)	2025Q2	$5.53	-61.1%	$76K
Renaissance Technologies	2025Q2	$5.81	-63.0%	$40K
Ken Griffin (Citadel Advisors)	2025Q3	$6.38	-66.3%	$27K

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions0

—

Added to2

Ken Griffin (Citadel Advisors)
+2,703
$11K
Renaissance Technologies
+1,500
$6K

Trimmed1

Izzy Englander (Millennium Mgmt)
−3,112
$12K

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2025Q2	2	54,798	$303K	—
2025Q3	3	65,737	$463K	+1
2025Q4	3	66,828	$262K	—

Who owns SST

3 super-investors · 2025Q4

Tracked stake

66.8K

Combined value

$262K

% of shares outstanding

—

shares-out unknown

Quarter action mix

Added2Trim1

#	Manager	Shares	Value	% of book	Last action
1	Izzy Englander Millennium Mgmt	35.4K	$139K	0.0%	Trim−3.1K
2	Renaissance Technologies	18.6K	$73K	0.0%	Added+1.5K
3	Ken Griffin Citadel Advisors	12.8K	$50K	0.0%	Added+2.7K

Recent moves

7 transactions

ADDKen Griffin (Citadel Advisors)
+2,703 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−3,112 · 2025Q4
ADDRenaissance Technologies
+1,500 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−4,217 · 2025Q3
ADDRenaissance Technologies
+5,100 · 2025Q3
NEWIzzy Englander (Millennium Mgmt)
+42,778 · 2025Q2
NEWRenaissance Technologies
+12,020 · 2025Q2

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