Ticker · CUSIP 457730109
Holders (tracked)
19
Combined shares
5,759,961
Combined value
$531.24M
Last close
$57.59
Quarter
2025Q4
Price · 1Y$57.59-92.62 (-61.66%)H $161.88 · L $50.13 · Avg Vol 1.1M
Tracked holders · last 8 quarters
+6 vs previous quarter over the last 8.
Price is -37.6% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
25 events
- +112,873 shares · 2025Q4Position
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−1,237,091 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−22,377 shares · 2025Q4Position
- Ron Baron (Baron Capital / BAMCO) added2026-02-17+147,463 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+22,363 shares · 2025Q4Position
- D.E. Shaw & Co. added2026-02-17+853,305 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−154,668 shares · 2025Q4Position
- Steve Cohen (Point72) exited2026-02-17−91,896 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+283,243 shares · 2025Q4Position
- Wellington Management opened position2026-02-17+2,211,091 shares · 2025Q4Position
- −17,225 shares · 2025Q4Position
- Renaissance Technologies added2026-02-12+255,768 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+129,570 shares · 2025Q4Position
- Baillie Gifford & Co exited2026-01-23−1,084,350 shares · 2025Q4Position
- Two Sigma Investments added2025-11-14+17,802 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+344,635 shares · 2025Q3Position
- AQR Capital Management trimmed2025-11-14−71,993 shares · 2025Q3Position
- +356,808 shares · 2025Q3Position
- Steve Cohen (Point72) added2025-11-14+16,491 shares · 2025Q3Position
- T. Rowe Price trimmed2025-11-14−38,710 shares · 2025Q3Position
- −301,729 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+28,200 shares · 2025Q3Position
- Norges Bank (Norway SWF) exited2025-11-13−239,390 shares · 2025Q3Position
- −52,695 shares · 2025Q3Position
- Baillie Gifford & Co trimmed2025-10-31−29,538 shares · 2025Q3Position
Insider activity
Last 30 days
Net (open-market)
$0
Buys
0 · $0
Sells
0 · $0
Unique insiders
4
| Date | Insider | Code | Shares | Price | Value |
|---|---|---|---|---|---|
| 04-15 | Ellis Gary Lee Director | A | 518 | $52.07 | $27.0K |
| 04-15 | Broader Shelley G Director | A | 342 | $52.07 | $17.8K |
| 04-15 | Melenikiotou Georgia Director | A | 307 | $52.07 | $16.0K |
| 04-15 | Tansey Casey M Director | A | 308 | $52.07 | $16.0K |
Follow-the-investor returns
If you'd copied each holder of INSP…
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) | 2018Q2 | $77.95 | -26.1% | $5.8M |
| Izzy Englander (Millennium Mgmt) | 2018Q2 | $77.95 | -26.1% | $5.8M |
| D.E. Shaw & Co. | 2018Q3 | $88.07 | -34.6% | $69.8M |
| Ken Griffin (Citadel Advisors) | 2019Q1 | $91.70 | -37.2% | $29.4M |
| Ken Griffin (Citadel Advisors) | 2019Q1 | $91.70 | -37.2% | $29.4M |
| Ken Griffin (Citadel Advisors) | 2019Q1 | $91.70 | -37.2% | $29.4M |
| Paul Tudor Jones (Tudor Investment) | 2018Q4 | $93.50 | -38.4% | $179K |
| Paul Tudor Jones (Tudor Investment) | 2018Q4 | $93.50 | -38.4% | $179K |
| Paul Tudor Jones (Tudor Investment) | 2018Q4 | $93.50 | -38.4% | $179K |
| T. Rowe Price | 2018Q4 | $100.88 | -42.9% | $17.7M |
| Ron Baron (Baron Capital / BAMCO) | 2019Q1 | $102.77 | -44.0% | $19.4M |
| Wellington Management | 2018Q2 | $103.87 | -44.6% | $127.3M |
| Two Sigma Investments | 2018Q2 | $107.65 | -46.5% | $3.4M |
| Renaissance Technologies | 2019Q2 | $124.61 | -53.8% | $23.7M |
| Ray Dalio (Bridgewater Associates) | 2021Q1 | $146.12 | -60.6% | $4.1M |
| AQR Capital Management | 2019Q2 | $184.25 | -68.7% | $1.6M |
| Steve Cohen (Point72) | 2019Q1 | $186.68 | -69.1% | $242K |
| Steve Cohen (Point72) | 2019Q1 | $186.68 | -69.1% | $242K |
| Norges Bank (Norway SWF) | 2019Q2 | $3374.21 | -98.3% | $7.5M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions3
- Wellington Management+2,211,091$203.9M
- Norges Bank (Norway SWF)+129,570$12.0M
- Paul Tudor Jones (Tudor Investment)+112,873$10.4M
Added to5
- D.E. Shaw & Co.+853,305$78.7M
- Renaissance Technologies+255,768$23.6M
- Ron Baron (Baron Capital / BAMCO)+147,463$13.6M
- Two Sigma Investments+22,363$2.1M
- T. Rowe Price+283,243$26K
Trimmed4
- Ken Griffin (Citadel Advisors)−1,237,091$114.1M
- Izzy Englander (Millennium Mgmt)−154,668$14.3M
- AQR Capital Management−22,377$2.1M
- Ray Dalio (Bridgewater Associates)−17,225$1.6M
Exited2
- Baillie Gifford & Co−1,084,350$80.5M
- Steve Cohen (Point72)−91,896$6.8M
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 19 | $44.71B |
| 2022Q2 | 17 | $36.04B |
| 2022Q3 | 22 | $955.2M |
| 2022Q4 | 20 | $1.45B |
| 2023Q1 | 22 | $1.23B |
| 2023Q2 | 23 | $1.60B |
| 2023Q3 | 21 | $944.4M |
| 2023Q4 | 18 | $976.9M |
| 2024Q1 | 17 | $1.55B |
| 2024Q2 | 21 | $947.9M |
| 2024Q3 | 20 | $1.05B |
| 2024Q4 | 18 | $487.8M |
| 2025Q1 | 17 | $434.0M |
| 2025Q2 | 16 | $323.7M |
| 2025Q3 | 13 | $318.7M |
| 2025Q4 | 19 | $531.2M |
Who owns INSP
19 super-investors · 2025Q4
Tracked stake
5.76M
shares
Combined value
$531M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New5Added5Trim7Sold2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Wellington Management | 2.21M | $204M |
| 2 | D.E. Shaw & Co. | 1.21M | $112M |
| 3 | Ken Griffin Citadel Advisors | 511.3K | $47M |
| 4 | Renaissance Technologies | 410.8K | $38M |
| 5 | Ron Baron Baron Capital / BAMCO | 337.5K | $31M |
| 6 | T. Rowe Price | 308.2K | $28M |
| 7 | Izzy Englander Millennium Mgmt | 202.1K | $19M |
| 8 | Norges Bank Norway SWF | 129.6K | $12M |
| 9 | Paul Tudor Jones Tudor Investment | 112.9K | $10M |
| 10 | Izzy Englander Millennium Mgmt | 100.2K | $9M |
| 11 | Ray Dalio Bridgewater Associates | 71.7K | $7M |
| 12 | Two Sigma Investments | 59.5K | $5M |
| 13 | Ken Griffin Citadel Advisors | 35.3K | $3M |
| 14 | AQR Capital Management | 27.0K | $2M |
| 15 | Ken Griffin Citadel Advisors | 15.8K | $1M |
| 16 | Steve Cohen Point72 | 4.4K | $406K |
| 17 | Steve Cohen Point72 | 4.2K | $387K |
| 18 | Paul Tudor Jones Tudor Investment | 3.1K | $286K |
| 19 | Paul Tudor Jones Tudor Investment | 3.1K | $286K |
Recent moves
20 transactions
- +112,873 · 2025Q4
- +853,305 · 2025Q4
- −22,377 · 2025Q4
- −1,237,091 · 2025Q4
- +147,463 · 2025Q4
- −154,668 · 2025Q4
- −91,896 · 2025Q4
- +283,243 · 2025Q4
- +22,363 · 2025Q4
- +2,211,091 · 2025Q4
- −17,225 · 2025Q4
- +255,768 · 2025Q4
- +129,570 · 2025Q4
- −1,084,350 · 2025Q4
- +356,808 · 2025Q3
- +16,491 · 2025Q3
- +17,802 · 2025Q3
- +344,635 · 2025Q3
- TRIMT. Rowe Price−38,710 · 2025Q3
- −301,729 · 2025Q3
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