Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
340 institutional managers reported holding UCB for the quarter ended Mar 31, 2026. Together they hold about 84% of shares outstanding; the top 10 hold 56%. 46 opened new positions; 38 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 17.86M | 14.80% | $562.5M | trimmed -0.5% | ≤2013 |
| Vanguard Group | 14.44M | 11.96% | $454.8M | trimmed -0.5% | ≤2013 |
| FMR (Fidelity) | 8.95M | 7.41% | $281.8M | trimmed -1.7% | 2013 Q3 |
| Dimensional Fund Advisors | 6.52M | 5.40% | $205.3M | added +2.9% | ≤2013 |
| State Street | 6.23M | 5.16% | $196.3M | added +4.4% | ≤2013 |
| Neuberger Berman Group LLC | 3.49M | 2.89% | $109.9M | trimmed -29.7% | 2022 Q3 |
| Earnest Partners LLC | 3.36M | 2.78% | $105.7M | trimmed -2.7% | 2022 Q2 |
| Geode Capital | 2.98M | 2.47% | $93.8M | added +2.8% | ≤2013 |
| Goldman Sachs | 1.87M | 1.54% | $58.7M | added +35.1% | ≤2013 |
| Invesco | 1.77M | 1.47% | $55.9M | trimmed -1.7% | ≤2013 |
| Nomura Asset Management International INC. | 1.72M | 1.43% | $54.3M | trimmed -12.4% | 2025 Q4 |
| Snyder Capital Management L P | 1.68M | 1.39% | $53.0M | added +2.9% | 2016 Q3 |
| Charles Schwab Investment Management | 1.49M | 1.24% | $46.9M | added +1.8% | ≤2013 |
| BNY Mellon | 1.32M | 1.09% | $41.4M | added +8.6% | ≤2013 |
| Northern Trust | 1.31M | 1.09% | $41.3M | added +5.8% | ≤2013 |
| MFS Investment Management | 1.25M | 1.04% | $39.4M | added +4.8% | 2021 Q1 |
| BNP Paribas Financial Markets | 1.15M | 0.95% | $36.2M | added +8.8% | ≤2013 |
| Vaughan Nelson Investment Management, L.p. | 1.09M | 0.90% | $34.2M | opened | 2026 Q1 |
| Morgan Stanley | 979.3k | 0.81% | $30.8M | trimmed -9% | ≤2013 |
| Fisher Investments | 948.8k | 0.79% | $29.9M | trimmed -4.2% | 2022 Q4 |
| Systematic Financial Management LP | 878.3k | 0.73% | $27.7M | trimmed -2.4% | 2013 Q3 |
| Principal Financial Group INC | 766.6k | 0.64% | $24.1M | added +32.3% | ≤2013 |
| Bank OF America CORP /DE/ | 747.6k | 0.62% | $23.5M | added +27.6% | ≤2013 |
| Wellington Management | 713.8k | 0.59% | $22.5M | trimmed -6.9% | 2018 Q1 |
| Segall Bryant & Hamill, LLC | 684.5k | 0.57% | $21.6M | trimmed -10.6% | 2017 Q4 |
| Nuveen | 613.8k | 0.51% | $19.3M | trimmed -29% | 2019 Q2 |
| UBS | 520.3k | 0.43% | $16.4M | added +1.7% | ≤2013 |
| MetLife Investment Management, LLC | 509.2k | 0.42% | $16.0M | unchanged | 2017 Q4 |
| SEI Investments CO | 446.3k | 0.37% | $14.1M | added +10.1% | 2015 Q3 |
| Public Sector Pension Investment Board | 431.5k | 0.36% | $13.6M | added +2.5% | ≤2013 |
| Panagora Asset Management INC | 416.1k | 0.34% | $13.1M | added +103.1% | 2025 Q4 |
| Aristotle Capital Boston, LLC | 407.9k | 0.34% | $12.8M | trimmed -13.6% | 2021 Q4 |
| Verition Fund Management | 398.9k | 0.33% | $12.6M | added +205.5% | 2024 Q1 |
| Qube Research & Technologies LTD | 391.9k | 0.33% | $12.3M | trimmed -44% | 2023 Q4 |
| Millennium Management | 373.7k | 0.31% | $11.8M | added +623.6% | ≤2013 |
| Rhumbline Advisers | 351.5k | 0.29% | $11.1M | added +1.4% | ≤2013 |
| Interval Partners, LP | 304.3k | 0.25% | $9.6M | added +528.1% | 2025 Q4 |
| Raymond James Financial INC | 292.6k | 0.24% | $9.2M | trimmed -1.2% | 2015 Q3 |
| Legal & General Group PLC | 277.7k | 0.23% | $8.7M | trimmed -7.9% | 2014 Q3 |
| Ameriprise Financial INC | 273.8k | 0.23% | $8.6M | trimmed -9.2% | ≤2013 |
| AQR Capital | 246.1k | 0.20% | $7.7M | added +30.9% | 2024 Q4 |
| CalPERS | 244.7k | 0.20% | $7.7M | added +13.6% | 2022 Q1 |
| Cresset Asset Management, LLC | 241.6k | 0.20% | $7.6M | trimmed -15.8% | 2024 Q4 |
| Swiss National Bank | 240.6k | 0.20% | $7.6M | unchanged | ≤2013 |
| Schroder Investment Management Group | 230.8k | 0.19% | $7.3M | trimmed -29% | 2016 Q4 |
| Trexquant Investment LP | 219.6k | 0.18% | $6.9M | trimmed -9.5% | 2025 Q2 |
| ProShare Advisors LLC | 219.5k | 0.18% | $6.9M | added +2.5% | ≤2013 |
| Blair William & CO/IL | 217.8k | 0.18% | $6.9M | unchanged | 2023 Q3 |
| Citadel Advisors | 216.2k | 0.18% | $6.8M | trimmed -50.9% | 2023 Q2 |
| Voya Investment Management LLC | 210.9k | 0.17% | $6.6M | trimmed -7.6% | ≤2013 |
Largest 50 of 340 shown; the full ranked, searchable register is at boothcheck.com/holders/UCB. 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.