Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
356 institutional managers reported holding OPCH for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 56%. 56 opened new positions; 58 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 19.89M | 12.57% | $535.9M | unchanged | 2020 Q1 |
| Vanguard Group | 16.45M | 10.40% | $443.4M | trimmed -1.3% | 2020 Q1 |
| Wellington Management | 11.90M | 7.52% | $320.6M | trimmed -0.6% | 2023 Q2 |
| Durable Capital Partners LP (focused) | 8.99M | 5.68% | $242.3M | unchanged | 2024 Q3 |
| Fuller & Thaler Asset Management, INC. | 7.13M | 4.50% | $192.0M | added +2.4% | 2023 Q4 |
| FMR (Fidelity) | 6.43M | 4.06% | $173.2M | trimmed -31.2% | 2020 Q1 |
| State Street | 5.87M | 3.71% | $158.3M | added +1.5% | 2020 Q1 |
| Geode Capital | 4.25M | 2.69% | $114.5M | added +3.2% | 2020 Q1 |
| Arrowstreet Capital | 4.24M | 2.68% | $114.1M | unchanged | 2024 Q2 |
| Dimensional Fund Advisors | 3.88M | 2.45% | $104.5M | added +0.9% | 2020 Q1 |
| Southpoint Capital Advisors LP (focused) | 3.60M | 2.27% | $97.0M | added +20% | 2025 Q4 |
| Citadel Advisors | 3.54M | 2.24% | $95.3M | added +111.4% | 2020 Q1 |
| Morgan Stanley | 2.81M | 1.78% | $75.8M | trimmed -17.5% | 2020 Q1 |
| Sumitomo Mitsui Trust Group, INC. | 2.61M | 1.65% | $70.4M | opened | 2026 Q1 |
| Charles Schwab Investment Management | 2.49M | 1.57% | $67.1M | added +2.6% | 2020 Q1 |
| Boston Partners | 2.43M | 1.54% | $65.5M | added +67.6% | 2025 Q1 |
| Bank OF America CORP /DE/ | 1.95M | 1.23% | $52.4M | added +14.6% | 2020 Q1 |
| Northern Trust | 1.95M | 1.23% | $52.4M | trimmed -1.4% | 2020 Q1 |
| Duquesne Family Office | 1.87M | 1.18% | $50.3M | added +7% | 2025 Q2 |
| Manufacturers Life Insurance Company, THE | 1.80M | 1.14% | $48.6M | added +2.1% | 2020 Q1 |
| Alyeska Investment Group | 1.78M | 1.13% | $48.0M | added +47.2% | 2025 Q4 |
| Swedbank Robur | 1.73M | 1.09% | $46.5M | unchanged | 2025 Q3 |
| T. Rowe Price | 1.69M | 1.06% | $45.4M | trimmed -18.3% | 2020 Q1 |
| Millennium Management | 1.64M | 1.04% | $44.2M | added +241.2% | 2020 Q1 |
| Nuveen | 1.62M | 1.02% | $43.7M | added +3.6% | 2020 Q1 |
| Van Berkom & Associates INC. | 1.59M | 1.00% | $42.8M | opened | 2026 Q1 |
| Fort Washington Investment Advisors INC /OH/ | 1.48M | 0.94% | $39.9M | added +2.9% | 2024 Q2 |
| Geneva Capital Management LLC | 1.47M | 0.93% | $39.7M | added +19.4% | 2024 Q3 |
| AllianceBernstein | 1.43M | 0.91% | $38.6M | added +6% | 2020 Q1 |
| Goldman Sachs | 1.37M | 0.87% | $37.0M | added +50.5% | 2020 Q1 |
| Freestone Grove Partners LP | 1.24M | 0.78% | $33.4M | added +35.3% | 2024 Q4 |
| Loomis Sayles & CO L P | 1.24M | 0.78% | $33.4M | trimmed -0.8% | 2021 Q3 |
| UBS | 1.22M | 0.77% | $32.8M | trimmed -15.5% | 2020 Q1 |
| Jennison Associates LLC | 1.21M | 0.77% | $32.7M | added +4.2% | 2021 Q4 |
| Westfield Capital Management CO LP | 1.18M | 0.75% | $31.9M | trimmed -57.2% | 2021 Q2 |
| BNY Mellon | 1.08M | 0.69% | $29.2M | trimmed -1.4% | 2020 Q1 |
| Riverbridge Partners LLC | 984.4k | 0.62% | $26.5M | trimmed -22% | 2023 Q3 |
| MFS Investment Management | 916.7k | 0.58% | $24.7M | trimmed -28.6% | 2024 Q2 |
| Deutsche Bank AG\ | 803.9k | 0.51% | $21.7M | added +2% | 2020 Q1 |
| Schroder Investment Management Group | 801.4k | 0.51% | $21.6M | trimmed -38.8% | 2023 Q2 |
| Gilder Gagnon Howe & CO LLC | 801.1k | 0.51% | $21.6M | trimmed -0.9% | 2020 Q1 |
| Villere ST Denis J & CO LLC | 801.0k | 0.51% | $21.6M | trimmed -3.6% | 2022 Q4 |
| Amundi | 709.6k | 0.45% | $19.1M | trimmed -5.1% | 2022 Q1 |
| Arvin Capital Management LP (focused) | 699.5k | 0.44% | $18.8M | added +43.2% | 2025 Q1 |
| Teca Partners, LP (focused) | 691.1k | 0.44% | $18.6M | added +20.6% | 2025 Q1 |
| Silvercrest Asset Management Group LLC | 616.7k | 0.39% | $16.6M | added +18.3% | 2025 Q2 |
| Point72 | 562.7k | 0.36% | $15.2M | added +105.8% | 2020 Q2 |
| Renaissance Technologies | 558.9k | 0.35% | $15.1M | added +15.5% | 2023 Q1 |
| Invesco | 557.3k | 0.35% | $15.0M | added +4.3% | 2021 Q1 |
| Russell Investments Group, LTD. | 519.9k | 0.33% | $14.0M | added +95.5% | 2020 Q1 |
Largest 50 of 356 shown; the full ranked, searchable register is at boothcheck.com/holders/OPCH. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.