Ticker · CUSIP 45768S105
Holders (tracked)
9
Combined shares
1,727,256
Combined value
$132.20M
Last close
$76.19
Quarter
2025Q4
Price · 1Y$76.19-7.90 (-9.39%)H $91.41 · L $65.89 · Avg Vol 215K
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
Price is -0.5% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
19 events
- D.E. Shaw & Co. added2026-02-17+36,022 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+11,309 shares · 2025Q4Position
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−10,695 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+51,824 shares · 2025Q4Position
- Steve Cohen (Point72) added2026-02-17+83,982 shares · 2025Q4Position
- T. Rowe Price added2026-02-17+5,021 shares · 2025Q4Position
- AQR Capital Management added2026-02-17+86,942 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−26,200 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+139,200 shares · 2025Q4Position
- −22,773 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+109,185 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+131,483 shares · 2025Q3Position
- Steve Cohen (Point72) added2025-11-14+745 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+9,966 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+102,167 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+981 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−100 shares · 2025Q3Position
- Norges Bank (Norway SWF) exited2025-11-13−133,545 shares · 2025Q3Position
- Norges Bank (Norway SWF) trimmed2025-11-12−57,766 shares · 2024Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of IOSP…
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 |
|---|---|---|---|---|
| Steve Cohen (Point72) | 2016Q3 | $78.84 | -3.4% | $7.3M |
| AQR Capital Management | 2016Q1 | $79.79 | -4.5% | $20.4M |
| Norges Bank (Norway SWF) | 2016Q1 | $83.19 | -8.4% | $10.6M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $85.13 | -10.5% | $40.6M |
| D.E. Shaw & Co. | 2016Q1 | $85.86 | -11.3% | $23.6M |
| T. Rowe Price | 2016Q1 | $86.61 | -12.0% | $2.2M |
| Two Sigma Investments | 2016Q1 | $90.47 | -15.8% | $12.2M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $92.59 | -17.7% | $5.5M |
| Renaissance Technologies | 2016Q1 | $93.92 | -18.9% | $9.2M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Norges Bank (Norway SWF)+139,200$10.7M
Added to6
- AQR Capital Management+86,942$6.7M
- Steve Cohen (Point72)+83,982$6.4M
- Izzy Englander (Millennium Mgmt)+51,824$4.0M
- D.E. Shaw & Co.+36,022$2.8M
- Two Sigma Investments+11,309$866K
- T. Rowe Price+5,021$384
Trimmed2
- Renaissance Technologies−26,200$2.0M
- Ken Griffin (Citadel Advisors)−10,695$819K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 9 | $20.55B |
| 2022Q2 | 13 | $21.26B |
| 2022Q3 | 11 | $367.4M |
| 2022Q4 | 13 | $454.1M |
| 2023Q1 | 13 | $444.5M |
| 2023Q2 | 10 | $429.2M |
| 2023Q3 | 11 | $422.6M |
| 2023Q4 | 9 | $528.6M |
| 2024Q1 | 9 | $542.9M |
| 2024Q2 | 10 | $525.2M |
| 2024Q3 | 12 | $30.4M |
| 2024Q4 | 10 | $24.7M |
| 2025Q1 | 11 | $58.3M |
| 2025Q2 | 10 | $97.8M |
| 2025Q3 | 8 | $104.2M |
| 2025Q4 | 9 | $132.2M |
Who owns IOSP
9 super-investors · 2025Q4
Tracked stake
1.73M
shares
Combined value
$132M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added6Trim2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Izzy Englander Millennium Mgmt | 533.3K | $41M |
| 2 | D.E. Shaw & Co. | 309.9K | $24M |
| 3 | AQR Capital Management | 268.2K | $21M |
| 4 | Two Sigma Investments | 159.5K | $12M |
| 5 | Norges Bank Norway SWF | 139.2K | $11M |
| 6 | Renaissance Technologies | 120.3K | $9M |
| 7 | Steve Cohen Point72 | 95.8K | $7M |
| 8 | Ken Griffin Citadel Advisors | 72.7K | $6M |
| 9 | T. Rowe Price | 28.4K | $2M |
Recent moves
20 transactions
- +5,021 · 2025Q4
- +11,309 · 2025Q4
- +36,022 · 2025Q4
- +51,824 · 2025Q4
- +83,982 · 2025Q4
- −10,695 · 2025Q4
- +86,942 · 2025Q4
- −26,200 · 2025Q4
- +139,200 · 2025Q4
- −22,773 · 2025Q3
- +981 · 2025Q3
- +745 · 2025Q3
- +109,185 · 2025Q3
- +131,483 · 2025Q3
- +102,167 · 2025Q3
- +9,966 · 2025Q3
- −100 · 2025Q3
- −133,545 · 2025Q3
- −57,766 · 2024Q3
- −4,552 · 2025Q2
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