Ticker · CUSIP 68375N103
Holders (tracked)
10
Combined shares
6,843,517
Combined value
$8.16M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
SEC event timeline
16 events
- Two Sigma Investments trimmed2026-02-17−520,900 shares · 2025Q413F
- Ken Griffin (Citadel Advisors) added2026-02-17+2,577,558 shares · 2025Q413F
- +244,821 shares · 2025Q413F
- AQR Capital Management trimmed2026-02-17−846,459 shares · 2025Q413F
- +265,268 shares · 2025Q413F
- T. Rowe Price added2026-02-17+23,905 shares · 2025Q413F
- Renaissance Technologies exited2026-02-12−59,700 shares · 2025Q413F
- −244,821 shares · 2025Q313F
- AQR Capital Management added2025-11-14+1,937,516 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) exited2025-11-14−695,780 shares · 2025Q313F
- Two Sigma Investments trimmed2025-11-14−581,100 shares · 2025Q313F
- T. Rowe Price trimmed2025-11-14−94,220 shares · 2025Q313F
- Renaissance Technologies added2025-11-13+21,600 shares · 2025Q313F
- Norges Bank (Norway SWF) exited2025-11-13−39,477 shares · 2025Q313F
- Ken Fisher (Fisher Asset Mgmt) trimmed2025-11-12−301 shares · 2025Q313F
- Norges Bank (Norway SWF) trimmed2025-11-12−203,252 shares · 2024Q313F
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 positions2
- Izzy Englander (Millennium Mgmt)+265,268$334K
- Paul Tudor Jones (Tudor Investment)+244,821$308K
Added to2
- Ken Griffin (Citadel Advisors)+2,577,558$3.2M
- T. Rowe Price+23,905$30
Trimmed2
- AQR Capital Management−846,459$1.1M
- Two Sigma Investments−520,900$656K
Exited1
- Renaissance Technologies−59,700$93K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 14 | $13.34B |
| 2022Q2 | 14 | $8.32B |
| 2022Q3 | 15 | $6.2M |
| 2022Q4 | 15 | $60.6M |
| 2023Q1 | 15 | $67.4M |
| 2023Q2 | 13 | $113.7M |
| 2023Q3 | 14 | $77.9M |
| 2023Q4 | 11 | $64.5M |
| 2024Q1 | 12 | $46.8M |
| 2024Q2 | 12 | $43.4M |
| 2024Q3 | 11 | $14.3M |
| 2024Q4 | 11 | $19.3M |
| 2025Q1 | 10 | $28.8M |
| 2025Q2 | 12 | $6.2M |
| 2025Q3 | 9 | $7.6M |
| 2025Q4 | 10 | $8.2M |
Who owns OPK
10 super-investors · 2025Q4
Tracked stake
6.84M
shares
Combined value
$8M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added4Trim2Held2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Ken Griffin Citadel Advisors | 2.86M | $4M |
| 2 | AQR Capital Management | 2.03M | $3M |
| 3 | Two Sigma Investments | 734.7K | $926K |
| 4 | Izzy Englander Millennium Mgmt | 265.3K | $334K |
| 5 | Paul Tudor Jones Tudor Investment | 244.8K | $308K |
| 6 | Mario Gabelli GAMCO | 175.0K | $221K |
| 7 | Ken Griffin Citadel Advisors | 80.7K | $102K |
| 8 | Ken Griffin Citadel Advisors | 61.4K | $77K |
| 9 | Ken Fisher Fisher Asset Mgmt | 30.0K | $38K |
| 10 | T. Rowe Price | 367.2K | $463 |
Recent moves
20 transactions
- −846,459 · 2025Q4
- +2,577,558 · 2025Q4
- −520,900 · 2025Q4
- +23,905 · 2025Q4
- +265,268 · 2025Q4
- +244,821 · 2025Q4
- −59,700 · 2025Q4
- −244,821 · 2025Q3
- −581,100 · 2025Q3
- −695,780 · 2025Q3
- TRIMT. Rowe Price−94,220 · 2025Q3
- +1,937,516 · 2025Q3
- −39,477 · 2025Q3
- +21,600 · 2025Q3
- −301 · 2025Q3
- −203,252 · 2024Q3
- SOLDD.E. Shaw & Co.−4,731,688 · 2025Q2
- +190,972 · 2025Q2
- −5,691,131 · 2025Q2
- TRIMT. Rowe Price−64,162 · 2025Q2
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