Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
485 institutional managers reported holding ONON for the quarter ended Mar 31, 2026. Together they hold about 68% of shares outstanding; the top 10 hold 36%. 80 opened new positions; 117 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| FMR (Fidelity) | 24.08M | 8.11% | $819.4M | trimmed -18.9% | 2021 Q3 |
| Morgan Stanley | 22.47M | 7.57% | $764.5M | trimmed -6.9% | 2021 Q3 |
| Platinum Paramount Investment LTD. (focused) | 11.31M | 3.81% | $384.9M | unchanged | 2025 Q4 |
| Bamco INC /NY/ | 9.71M | 3.27% | $330.6M | added +79.7% | 2022 Q1 |
| Sinvest Investments II LTD. (focused) | 8.40M | 2.83% | $285.9M | unchanged | 2025 Q4 |
| UBS | 7.48M | 2.52% | $254.4M | added +97.2% | 2021 Q3 |
| Ilex Capital Partners (UK) LLP | 6.59M | 2.22% | $224.1M | opened | 2025 Q1 |
| Sands Capital | 6.33M | 2.13% | $215.3M | trimmed -4.7% | 2025 Q2 |
| BlackRock | 5.76M | 1.94% | $196.1M | unchanged | 2021 Q3 |
| AllianceBernstein | 5.69M | 1.92% | $193.8M | trimmed -48.6% | 2024 Q2 |
| Jane Street | 5.23M | 1.76% | $177.9M | added +548.3% | 2021 Q3 |
| Citadel Advisors | 3.85M | 1.30% | $130.9M | added +25% | 2021 Q3 |
| American Century Companies INC | 2.94M | 0.99% | $100.2M | trimmed -7.3% | 2021 Q3 |
| Wellington Management | 2.69M | 0.91% | $91.5M | trimmed -5.5% | 2023 Q4 |
| Ameriprise Financial INC | 2.60M | 0.88% | $88.5M | trimmed -14.9% | 2023 Q1 |
| Goldman Sachs | 2.59M | 0.87% | $88.3M | added +124.2% | 2021 Q3 |
| State Street | 2.53M | 0.85% | $86.0M | added +4.2% | 2022 Q3 |
| Select Equity Group | 2.47M | 0.83% | $83.9M | added +31.6% | 2025 Q4 |
| Federated Hermes, INC. | 2.15M | 0.72% | $73.2M | added +141.4% | 2023 Q3 |
| Holocene Advisors | 2.11M | 0.71% | $71.9M | trimmed -11.9% | 2025 Q4 |
| Clearbridge Investments, LLC | 1.97M | 0.66% | $67.0M | trimmed -9.7% | 2025 Q3 |
| Jennison Associates LLC | 1.96M | 0.66% | $66.6M | trimmed -27.5% | 2021 Q3 |
| Balyasny Asset Management | 1.88M | 0.63% | $63.9M | added +6.8% | 2024 Q1 |
| T. Rowe Price | 1.84M | 0.62% | $62.5M | trimmed -33% | 2021 Q3 |
| Franklin Resources | 1.79M | 0.60% | $60.9M | trimmed -15.8% | 2024 Q1 |
| FengHe Fund Management Pte. LTD. (focused) | 1.70M | 0.57% | $57.8M | trimmed -44.5% | 2025 Q4 |
| Millennium Management | 1.69M | 0.57% | $57.4M | added +48.5% | 2021 Q3 |
| Nomura Asset Management International INC. | 1.53M | 0.52% | $52.1M | trimmed -19.5% | 2024 Q4 |
| Geode Capital | 1.52M | 0.51% | $51.8M | added +2.2% | 2025 Q2 |
| Bank OF America CORP /DE/ | 1.29M | 0.43% | $43.9M | trimmed -24.9% | 2021 Q3 |
| Marshall Wace | 1.26M | 0.43% | $43.0M | added +78.6% | 2021 Q3 |
| ThornTree Capital Partners LP (focused) | 1.20M | 0.40% | $40.7M | added +38.9% | 2021 Q4 |
| Bessemer Group INC | 1.19M | 0.40% | $40.7M | added +5.7% | 2025 Q2 |
| Susquehanna International Group | 1.07M | 0.36% | $36.5M | added +333.2% | 2023 Q2 |
| Apeiron Capital LTD (focused) | 996.1k | 0.34% | $33.9M | added +25.2% | 2022 Q3 |
| Ogborne Capital Management, LLC (focused) | 951.2k | 0.32% | $32.4M | added +12.5% | 2022 Q2 |
| Fiera Capital CORP | 938.2k | 0.32% | $31.9M | added +1.9% | 2025 Q2 |
| SG Americas Securities, LLC | 880.3k | 0.30% | $30.0M | added +489.8% | 2021 Q4 |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 871.7k | 0.29% | $29.7M | added +4.7% | 2021 Q3 |
| Citigroup INC | 853.0k | 0.29% | $29.0M | trimmed -14.8% | 2021 Q3 |
| Vanguard Group | 781.7k | 0.26% | $26.6M | trimmed -4.2% | 2023 Q1 |
| Pictet Asset Management Holding SA | 736.0k | 0.25% | $25.0M | trimmed -3.3% | 2021 Q3 |
| Alyeska Investment Group | 700.0k | 0.24% | $23.8M | opened | 2025 Q3 |
| Bwcp, LP (focused) | 680.7k | 0.23% | $23.2M | added +24.4% | 2025 Q3 |
| Cerity Partners LLC | 677.1k | 0.23% | $23.0M | trimmed -20.7% | 2022 Q3 |
| Impax Asset Management Group plc | 672.5k | 0.23% | $22.9M | added +629.3% | 2024 Q4 |
| Janus Henderson | 671.7k | 0.23% | $22.9M | unchanged | 2023 Q4 |
| Ossiam | 671.5k | 0.23% | $22.9M | added +107.6% | 2025 Q3 |
| Voya Investment Management LLC | 654.7k | 0.22% | $22.3M | trimmed -11.4% | 2023 Q3 |
| Villere ST Denis J & CO LLC | 615.8k | 0.21% | $21.0M | trimmed -6.5% | 2022 Q3 |
Largest 50 of 485 shown; the full ranked, searchable register is at boothcheck.com/holders/ONON. 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.