GBIO — GENERATION BIO CO
Reported value held$24.23M
Funds holding (latest)35
Sector—
GBIO (GENERATION BIO CO) is tracked on HoldingsHub across five years of quarterly 13F filings. 35 funds have reported positions historically, with the sum of their latest reported stakes valued at $24.23M. No fund in our coverage reported a position in the latest filing period, which typically means the stock has fallen out of the tracked funds' portfolios rather than that it cannot be bought.
All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.
| Fund | Quarter | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|---|
| Casdin Capital history | Q1 2022 | 1.32M | $9.72M | 0.44% | Hold |
| Farallon Capital Management history | Q4 2022 | 1.25M | $4.91M | 0.03% | Reduce |
| Renaissance Technologies history | Q4 2025 | 287.61K | $1.63M | 0.00% | Reduce |
| Vanguard Group history | Q4 2025 | 229.83K | $1.31M | 0.00% | Hold |
| UBS Group AG history | Q4 2025 | 164.72K | $935.59K | 0.00% | Add |
| Morgan Stanley history | Q4 2025 | 161.38K | $916.63K | 0.00% | Reduce |
| Marshall Wace history | Q4 2025 | 140.29K | $796.87K | 0.00% | Reduce |
| Goldman Sachs Group history | Q4 2025 | 91.53K | $519.87K | 0.00% | Reduce |
| Millennium Management history | Q4 2025 | 88.56K | $503.04K | 0.00% | Reduce |
| Bank of America Corp history | Q4 2025 | 84.84K | $481.90K | 0.00% | Hold |
| D. E. Shaw & Co history | Q4 2024 | 344.92K | $365.62K | 0.00% | Reduce |
| BlackRock Inc history | Q4 2025 | 60.07K | $341.20K | 0.00% | Hold |
| Wellington Management Group history | Q2 2024 | 119.36K | $336.58K | 0.00% | New |
| Geode Capital Management history | Q4 2025 | 51.80K | $294.27K | 0.00% | Add |
| Two Sigma Investments history | Q4 2025 | 50.56K | $287.16K | 0.00% | Add |
| Citadel Advisors history | Q4 2025 | 47.24K | $268.35K | 0.00% | Hold |
| MFS Investment Management history | Q3 2022 | 25.68K | $136.00K | 0.00% | New |
| Northern Trust Corp history | Q4 2025 | 17.06K | $96.89K | 0.00% | Add |
| Manulife Financial history | Q4 2025 | 14.40K | $80.48K | 0.00% | Hold |
| Charles Schwab Investment Management history | Q2 2025 | 236.86K | $75.82K | 0.00% | Reduce |
New Positions (latest)
No fund opened a new position this quarter.
Fully Exited (vs previous quarter)
No tracked fund fully exited this quarter.
Fund Position History — shares by quarter (top 20 funds)
| Fund | Q1 2021 | Q2 2021 | Q3 2021 | Q4 2021 | Q1 2022 | Q2 2022 | Q3 2022 | Q4 2022 | Q1 2023 | Q2 2023 | Q3 2023 | Q4 2023 | Q1 2024 | Q2 2024 | Q3 2024 | Q4 2024 | Q1 2025 | Q2 2025 | Q3 2025 | Q4 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Renaissance Technologies | — | — | — | 228.90K | 72.50K | 287.13K | 290.20K | 252.00K | 287.00K | 308.10K | 314.80K | 689.40K | 664.50K | 636.40K | 594.30K | 962.96K | 1.88M | 2.58M | 344.26K | 287.61K |
| Vanguard Group | 2.94M | 3.23M | 3.55M | 3.59M | 3.55M | 2.21M | 2.22M | 2.23M | 2.24M | 2.26M | 2.34M | 2.55M | 2.57M | 2.59M | 2.64M | 2.64M | 2.62M | 2.30M | 229.83K | 229.83K |
| UBS Group AG | — | — | — | 109.33K | 6.18K | 10.08K | 371.94K | 379.46K | 387.28K | 401.47K | 397.61K | 867.40K | 868.10K | 837.85K | 846.89K | 1.05M | 977.35K | 884.90K | 148.72K | 164.72K |
| Morgan Stanley | — | — | 236.80K | 244.15K | 213.35K | 203.82K | 486.88K | 491.98K | 513.79K | 524.22K | 502.97K | 1.06M | 941.78K | 936.40K | 999.67K | 939.83K | 878.94K | 912.83K | 164.27K | 161.38K |
| Marshall Wace | — | — | 37.21K | 54.47K | 34.47K | 34.47K | 33.82K | 34.47K | 34.47K | 34.47K | 34.47K | 123.59K | — | — | — | — | — | 116.20K | 218.46K | 140.29K |
| Goldman Sachs Group | — | — | 349.03K | 70.99K | 205.17K | 213.62K | 815.58K | 802.00K | 689.54K | 720.95K | 690.47K | 1.16M | 1.24M | 1.28M | 1.19M | 1.21M | 1.09M | 1.06M | 118.58K | 91.53K |
| Millennium Management | — | — | — | 538.39K | — | 70.56K | 10.35K | 25.92K | 39.32K | 29.19K | 30.67K | 752.75K | 222.74K | 97.95K | — | 91.58K | — | 1.06M | 97.35K | 88.56K |
| Bank of America Corp | — | — | 32.69K | 168.25K | 21.95K | 20.79K | 606.46K | 865.26K | 542.80K | 530.44K | 507.52K | 2.53M | 2.99M | 2.98M | 2.98M | 3.00M | 1.29M | 871.95K | 84.82K | 84.84K |
| BlackRock Inc | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3.42M | 3.46M | 3.41M | 1.16M | 60.12K | 60.07K |
| Geode Capital Management | — | — | 786.64K | 749.22K | 793.04K | 820.50K | 854.93K | 868.50K | 933.76K | 1.00M | 1.01M | 1.08M | 1.07M | 1.14M | 1.14M | 1.14M | 1.11M | 498.08K | 49.80K | 51.80K |
| Two Sigma Investments | — | — | — | 242.98K | 114.92K | 12.00K | 31.57K | — | — | — | — | 317.08K | 314.15K | 229.42K | 149.90K | 120.40K | 105.55K | 105.96K | 12.44K | 50.56K |
| Citadel Advisors | — | — | 8.60K | 28.71K | 48.49K | 54.64K | 21.48K | 12.49K | 12.60K | 38.69K | 16.73K | 129.18K | 65.52K | 49.77K | — | 106.00K | 192.46K | 307.76K | 47.20K | 47.24K |
| Northern Trust Corp | — | — | 435.52K | 420.18K | 404.18K | 412.58K | 413.70K | 425.15K | 385.09K | 374.29K | 370.86K | 373.08K | 383.29K | 365.91K | 391.82K | 403.07K | 369.91K | 133.09K | 13.31K | 17.06K |
| Manulife Financial | — | — | 22.46K | 23.26K | 152.53K | 152.57K | 152.01K | 152.71K | 152.71K | 152.26K | 152.26K | 144.32K | 151.47K | 164.57K | 163.98K | 145.09K | 143.98K | 143.98K | 14.40K | 14.40K |
| Fidelity Management & Research (FMR) | — | — | 8.52M | 8.54M | 8.55M | 8.56M | 8.85M | 8.91M | 8.95M | 8.62M | 8.43M | 5.35M | 5.33M | 5.30M | 5.32M | 4.63M | 4.75M | 2.35M | 13.03K | 2.62K |
| JPMorgan Chase & Co | — | — | 1.81M | 562.00K | 660.27K | 644.26K | 458.07K | 461.14K | 427.02K | 901.32K | 1.41M | 285.89K | 268.08K | 173.69K | 170.19K | 297.70K | 201.96K | 4.33K | 687 | 689 |
| T. Rowe Price Associates | — | — | 8.63M | 8.65M | 8.76M | 8.93M | 7.40M | 7.26M | 7.64M | 7.49M | 7.45M | 6.93M | 8.88M | 9.51M | 9.35M | 9.28M | 9.06M | 8.46M | 576.79K | 209.64K |
| Wells Fargo & Co | — | — | 686 | 20.11K | 6.11K | 2.67K | 2.22K | 2.10K | 10.65K | 19.40K | 13.76K | 18.32K | 20.37K | 26.08K | 27.05K | 32.84K | 30.20K | 1.53K | 50 | 50 |
| Citigroup Inc | — | — | 63.83K | 112.68K | 19.92K | 5.08K | 2.50K | 2.19K | 679 | 14.60K | 841 | 6.47K | 8.51K | 11.13K | 37.12K | 41.48K | 34.79K | 10.36K | 668 | — |
| Deutsche Bank AG | — | — | 157.37K | 152.36K | 152.58K | 148.20K | 139.96K | 150.28K | 29.18K | 19.20K | 19.20K | 1.23M | 1.25M | 558.00K | 23.35K | 184.17K | 108.77K | — | — | — |