Ticker · CUSIP 45779A846
Holders (tracked)
2
Combined shares
317,800
Combined value
$565.7K
Last close
$1.35
Quarter
2025Q4
Price · 1Y$1.35-1.24 (-47.88%)H $2.79 · L $1.29 · Avg Vol 100K
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
Price is -24.2% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
3 events
- Ken Griffin (Citadel Advisors) added2026-02-17+155,756 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−23,333 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+130,405 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of NSPR…
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 |
|---|---|---|---|---|
| Ken Griffin (Citadel Advisors) | 2021Q2 | $1.89 | -28.4% | $262K |
| Izzy Englander (Millennium Mgmt) | 2022Q2 | $2.47 | -45.3% | $168K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions0
—
Added to1
- Ken Griffin (Citadel Advisors)+155,756$277K
Trimmed1
- Izzy Englander (Millennium Mgmt)−23,333$42K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2021Q2 | 3 | $940K |
| 2021Q4 | 1 | $37K |
| 2022Q2 | 1 | $28K |
| 2022Q4 | 3 | $33K |
| 2023Q1 | 1 | $14K |
| 2023Q2 | 1 | $36K |
| 2023Q3 | 3 | $1.4M |
| 2023Q4 | 2 | $1.0M |
| 2024Q1 | 4 | $1.0M |
| 2024Q2 | 2 | $1.1M |
| 2024Q3 | 1 | $1.1M |
| 2024Q4 | 2 | $895K |
| 2025Q1 | 2 | $130K |
| 2025Q2 | 2 | $98K |
| 2025Q3 | 2 | $447K |
| 2025Q4 | 2 | $566K |
Who owns NSPR
2 super-investors · 2025Q4
Tracked stake
317.8K
shares
Combined value
$566K
% of shares outstanding
—
shares-out unknown
Quarter action mix
Added1Trim1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Ken Griffin Citadel Advisors | 193.7K | $345K |
| 2 | Izzy Englander Millennium Mgmt | 124.1K | $221K |
Recent moves
20 transactions
- −23,333 · 2025Q4
- +155,756 · 2025Q4
- +130,405 · 2025Q3
- −31,378 · 2025Q2
- −313,981 · 2025Q1
- +20,978 · 2025Q1
- −68,819 · 2024Q4
- +10,400 · 2024Q4
- −21,907 · 2024Q3
- −10,800 · 2024Q3
- +96 · 2024Q2
- −1,600 · 2024Q2
- +73,355 · 2024Q1
- −2,600 · 2024Q1
- −219,093 · 2023Q4
- +142,448 · 2023Q4
- −1,700 · 2023Q4
- +2,500 · 2023Q3
- +219,093 · 2023Q3
- +205,826 · 2023Q3
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