Ticker · CUSIP 46501C100
Holders (tracked)
4
Combined shares
71,363
Combined value
$199.8K
Last close
$1.87
Quarter
2025Q4
Price · 1Y$1.87-1.07 (-36.39%)H $3.68 · L $1.50 · Avg Vol 63K
Position opened
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
Price is -33.2% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
4 events
- Ken Griffin (Citadel Advisors) added2026-02-17+5,938 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−7,354 shares · 2025Q4Position
- Renaissance Technologies opened position2026-02-12+10,100 shares · 2025Q4Position
- AQR Capital Management added2025-11-14+17,994 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ISPR…
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 |
|---|---|---|---|---|
| AQR Capital Management | 2025Q2 | $2.56 | -27.0% | $47K |
| Renaissance Technologies | 2025Q4 | $2.80 | -33.2% | $19K |
| Ken Griffin (Citadel Advisors) | 2023Q2 | $3.29 | -43.2% | $41K |
| Ken Griffin (Citadel Advisors) | 2023Q2 | $3.29 | -43.2% | $41K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Renaissance Technologies+10,100$28K
Added to1
- Ken Griffin (Citadel Advisors)+5,938$17K
Trimmed1
- AQR Capital Management−7,354$21K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2023Q2 | 3 | $752K |
| 2023Q3 | 1 | $577K |
| 2023Q4 | 3 | $10.1M |
| 2024Q1 | 3 | $5.6M |
| 2024Q2 | 3 | $7.9M |
| 2024Q3 | 2 | $140K |
| 2024Q4 | 2 | $226K |
| 2025Q1 | 2 | $100K |
| 2025Q2 | 2 | $117K |
| 2025Q3 | 3 | $158K |
| 2025Q4 | 4 | $200K |
Who owns ISPR
4 super-investors · 2025Q4
Tracked stake
71.4K
shares
Combined value
$200K
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added2Trim1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | AQR Capital Management | 25.0K | $70K |
| 2 | Ken Griffin Citadel Advisors | 22.1K | $62K |
| 3 | Ken Griffin Citadel Advisors | 14.2K | $40K |
| 4 | Renaissance Technologies | 10.1K | $28K |
Recent moves
12 transactions
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- ISPR insider tradingEvery Form 4 filing by ISPR officers, directors, and 10%+ holders.
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