| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| PRICE T ROWE ASSOCIATES INC /MD/ | 8.6% | -31% | $3,449,198 | -$47,157,216 | 576,789 | -93% | T. Rowe Price Associates, Inc. | 30 Sep 2025 |
| SymBiosis Capital Partners, LLC | 6.3% | $2,523,117 | 421,926 | SymBiosis Capital Partners, LLC | 30 Sep 2025 | |||
| RENAISSANCE TECHNOLOGIES LLC | 5.1% | $2,058,693 | 344,263 | Renaissance Technologies LLC | 01 Jul 2025 |
As of 30 Sep 2025, 35 institutional investors reported holding 3,110,648 shares of Generation Bio Co. - Common Stock (GBIO). This represents 46% of the company’s total 6,697,238 outstanding shares.
The largest institutional shareholders of Generation Bio Co. - Common Stock (GBIO) together control 46% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| PRICE T ROWE ASSOCIATES INC /MD/ | 8.6% | 576,789 | 0% | $3,531,000 | |
| RENAISSANCE TECHNOLOGIES LLC | 5.1% | 344,263 | 0% | $2,106,890 | |
| Siren, L.L.C. | 4.4% | 296,892 | 0.07% | $1,816,979 | |
| VANGUARD GROUP INC | 3.4% | 229,833 | 0% | $1,406,578 | |
| MARSHALL WACE, LLP | 3.3% | 218,461 | +88% | 0% | $1,336,981 |
| BAKER BROS. ADVISORS LP | 2.9% | 194,493 | 0.01% | $1,190,297 | |
| MORGAN STANLEY | 2.5% | 164,270 | 0% | $1,005,333 | |
| UBS Group AG | 2.2% | 148,721 | 0% | $910,172 | |
| ACADIAN ASSET MANAGEMENT LLC | 1.9% | 127,506 | 0% | $779,000 | |
| GOLDMAN SACHS GROUP INC | 1.8% | 118,583 | 0% | $725,728 | |
| Yiheng Capital Management, L.P. | 1.6% | 105,524 | 0.21% | $645,807 | |
| CANTOR FITZGERALD, L. P. | 1.5% | 99,000 | 0.01% | $605,880 | |
| MILLENNIUM MANAGEMENT LLC | 1.5% | 97,354 | 0% | $595,806 | |
| BANK OF AMERICA CORP /DE/ | 1.3% | 84,817 | 0% | $519,079 | |
| BlackRock, Inc. | 0.9% | 60,116 | 0% | $367,910 | |
| GEODE CAPITAL MANAGEMENT, LLC | 0.74% | 49,805 | 0% | $304,890 | |
| CITADEL ADVISORS LLC | 0.7% | 47,197 | 0% | $288,846 | |
| TD Asset Management Inc | 0.4% | 26,708 | 0% | $163,453 | |
| ADAR1 Capital Management, LLC | 0.33% | 22,144 | 0.01% | $135,521 | |
| STATE STREET CORP | 0.3% | 19,993 | 0% | $122,357 | |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | 0.21% | 14,398 | 0% | $88,116 | |
| NORTHERN TRUST CORP | 0.2% | 13,306 | 0% | $81,433 | |
| FMR LLC | 0.19% | 13,031 | 0% | $79,750 | |
| TWO SIGMA INVESTMENTS, LP | 0.19% | 12,442 | 0% | $76,145 | |
| XTX Topco Ltd | 0.17% | 11,344 | 0% | $69,425 |