Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
286 institutional managers reported holding OPLN for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 56%. 47 opened new positions; 56 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 15.48M | 14.32% | $451.1M | added +0.6% | ≤2013 |
| Vanguard Group | 11.72M | 10.84% | $341.5M | unchanged | ≤2013 |
| Dimensional Fund Advisors | 6.73M | 6.22% | $196.0M | unchanged | ≤2013 |
| Bank OF Montreal /CAN/ | 6.42M | 5.93% | $186.9M | trimmed -13.2% | 2021 Q4 |
| Hawk Ridge Capital Management LP (focused) | 4.97M | 4.59% | $144.7M | added +72.5% | 2021 Q3 |
| State Street | 4.08M | 3.77% | $118.8M | trimmed -4.8% | ≤2013 |
| Neuberger Berman Group LLC | 3.52M | 3.26% | $102.6M | added +1% | 2017 Q3 |
| American Century Companies INC | 2.63M | 2.43% | $76.6M | trimmed -15.7% | 2020 Q3 |
| Geode Capital | 2.58M | 2.38% | $75.1M | trimmed -3.1% | ≤2013 |
| Brown Advisory INC | 2.17M | 2.00% | $63.1M | trimmed -28.1% | 2024 Q4 |
| Morgan Stanley | 1.88M | 1.74% | $54.7M | added +9.4% | ≤2013 |
| Woodline Partners LP | 1.81M | 1.67% | $52.7M | added +77.2% | 2025 Q3 |
| Invesco | 1.69M | 1.56% | $49.2M | trimmed -42.8% | ≤2013 |
| FMR (Fidelity) | 1.61M | 1.49% | $47.0M | trimmed -34.3% | ≤2013 |
| Sunriver Management LLC (focused) | 1.52M | 1.40% | $44.2M | added +1.3% | 2023 Q3 |
| Charles Schwab Investment Management | 1.50M | 1.39% | $43.7M | trimmed -1.6% | ≤2013 |
| Northern Trust | 1.48M | 1.37% | $43.2M | added +6.7% | ≤2013 |
| No Street GP LP (focused) | 1.35M | 1.25% | $39.3M | added +58.6% | 2025 Q4 |
| Advisory Research INC | 1.28M | 1.19% | $37.3M | added +13.1% | 2024 Q4 |
| Arrowstreet Capital | 1.25M | 1.16% | $36.5M | added +7.5% | 2023 Q2 |
| Park West Asset Management LLC (focused) | 1.25M | 1.15% | $36.3M | opened | 2026 Q1 |
| Marathon Asset Management LTD | 1.10M | 1.02% | $32.2M | added +13.4% | 2020 Q3 |
| Mawer Investment Management LTD. | 1.08M | 1.00% | $31.6M | added +191.3% | 2025 Q4 |
| Two Sigma | 881.2k | 0.81% | $25.7M | added +84.3% | 2023 Q2 |
| Lone Peak Global Investors LLC (focused) | 857.0k | 0.79% | $25.0M | added +39.7% | 2024 Q3 |
| Silvercrest Asset Management Group LLC | 830.4k | 0.77% | $24.2M | opened | 2026 Q1 |
| Public Sector Pension Investment Board | 829.5k | 0.77% | $24.2M | added +10.7% | 2018 Q3 |
| BNY Mellon | 793.2k | 0.73% | $23.1M | trimmed -2.7% | ≤2013 |
| Paradice Investment Management LLC (focused) | 786.8k | 0.73% | $22.9M | trimmed -1.7% | 2021 Q1 |
| TFJ Management, LLC (focused) | 786.2k | 0.73% | $22.9M | added +4.5% | 2024 Q4 |
| Kimelman & Baird, LLC | 779.9k | 0.72% | $22.7M | trimmed -3.7% | 2024 Q4 |
| D. E. Shaw | 764.3k | 0.71% | $22.3M | added +24.4% | ≤2013 |
| Nuveen | 713.3k | 0.66% | $20.8M | added +1.2% | 2013 Q3 |
| Ameriprise Financial INC | 664.5k | 0.61% | $19.4M | added +191.3% | ≤2013 |
| Goldman Sachs | 636.7k | 0.59% | $18.5M | added +42.9% | ≤2013 |
| Qube Research & Technologies LTD | 611.7k | 0.57% | $17.8M | trimmed -30.8% | 2023 Q3 |
| Harris Associates (Oakmark) | 571.2k | 0.53% | $16.6M | trimmed -58.5% | 2021 Q3 |
| Driehaus Capital Management LLC | 568.2k | 0.53% | $16.6M | trimmed -3.4% | 2025 Q2 |
| Frontier Capital Management CO LLC | 540.3k | 0.50% | $15.7M | added +39.3% | 2020 Q4 |
| Principal Financial Group INC | 516.4k | 0.48% | $15.0M | added +2% | ≤2013 |
| Gamco Investors, INC. et al | 452.0k | 0.42% | $13.2M | unchanged | ≤2013 |
| Polar Capital Holdings PLC | 412.6k | 0.38% | $12.0M | opened | 2026 Q1 |
| First Trust Advisors LP | 406.6k | 0.38% | $11.8M | added +3.2% | 2023 Q4 |
| UBS | 385.8k | 0.36% | $11.2M | trimmed -4.4% | ≤2013 |
| Bank OF America CORP /DE/ | 341.9k | 0.32% | $10.0M | trimmed -6.9% | ≤2013 |
| Jane Street | 339.0k | 0.31% | $9.9M | added +239.5% | 2020 Q2 |
| Allianz Asset Management GmbH | 331.7k | 0.31% | $9.7M | added +7.9% | 2025 Q4 |
| Victory Capital Management INC | 326.4k | 0.30% | $9.5M | added +10.8% | 2015 Q3 |
| Philadelphia Financial Management of San Francisco, LLC (focused) | 321.8k | 0.30% | $9.4M | opened | 2026 Q1 |
| Intrinsic Edge Capital Management LLC | 299.0k | 0.28% | $8.7M | trimmed -33.1% | 2025 Q2 |
Largest 50 of 286 shown; the full ranked, searchable register is at boothcheck.com/holders/OPLN. 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.