Ticker · CUSIP 85859N300
Holders (tracked)
7
Combined shares
206,350
Combined value
$2.95M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
Flat over the last 3 quarters.
SEC event timeline
11 events
- Ken Griffin (Citadel Advisors) exited2026-02-17−44,340 shares · 2025Q413F
- Two Sigma Investments trimmed2026-02-17−8,946 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−8,802 shares · 2025Q413F
- Steve Cohen (Point72) trimmed2026-02-17−41,291 shares · 2025Q413F
- T. Rowe Price trimmed2026-02-17−1,825 shares · 2025Q413F
- Renaissance Technologies opened position2026-02-12+11,200 shares · 2025Q413F
- AQR Capital Management exited2025-11-14−48,446 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−37,843 shares · 2025Q313F
- Steve Cohen (Point72) opened position2025-11-14+52,391 shares · 2025Q313F
- Two Sigma Investments added2025-11-14+77,307 shares · 2025Q313F
- T. Rowe Price trimmed2025-11-14−1 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions1
- Renaissance Technologies+11,200$169K
Added to0
—
Trimmed4
- Steve Cohen (Point72)−41,291$621K
- Two Sigma Investments−8,946$135K
- Izzy Englander (Millennium Mgmt)−8,802$132K
- T. Rowe Price−1,825$28
Exited1
- Ken Griffin (Citadel Advisors)−44,340$777K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2025Q2 | 5 | $1.0M |
| 2025Q3 | 7 | $5.2M |
| 2025Q4 | 7 | $2.9M |
Who owns STEM
7 super-investors · 2025Q4
Tracked stake
206.3K
shares
Combined value
$3M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Trim4Sold2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Two Sigma Investments | 85.1K | $1M |
| 2 | Izzy Englander Millennium Mgmt | 33.0K | $496K |
| 3 | Ken Griffin Citadel Advisors | 32.0K | $481K |
| 4 | Ken Griffin Citadel Advisors | 23.5K | $354K |
| 5 | Renaissance Technologies | 11.2K | $169K |
| 6 | Steve Cohen Point72 | 11.1K | $167K |
| 7 | T. Rowe Price | 10.5K | $159 |
Recent moves
15 transactions
- −8,946 · 2025Q4
- −8,802 · 2025Q4
- −44,340 · 2025Q4
- −41,291 · 2025Q4
- TRIMT. Rowe Price−1,825 · 2025Q4
- +11,200 · 2025Q4
- TRIMT. Rowe Price−1 · 2025Q3
- −37,843 · 2025Q3
- −48,446 · 2025Q3
- +52,391 · 2025Q3
- +77,307 · 2025Q3
- +48,446 · 2025Q2
- +79,612 · 2025Q2
- +16,738 · 2025Q2
- +12,340 · 2025Q2
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