Generation Bio
GBIO
GBIO was delisted on the 6th of February, 2026.
88 hedge funds and large institutions have $1.27B invested in Generation Bio in 2021 Q1 according to their latest regulatory filings, with 30 funds opening new positions, 44 increasing their positions, 8 reducing their positions, and 9 closing their positions.
450% more repeat investments, than reductions
Existing positions increased: 44 | Existing positions reduced: 8
233% more first-time investments, than exits
New positions opened: 30 | Existing positions closed: 9
40% more capital invested
Capital invested by funds: $906M → $1.27B (+$361M)
29% more funds holding
Funds holding: 68 → 88 (+20)
1.02% more ownership
Funds ownership: 6.87% → 7.9% (+1%)
75% less funds holding in top 10
Funds holding in top 10: 4 → 1 (-3)
100% less call options, than puts
Call options by funds: $0 | Put options by funds: $6.11M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$66.9M |
| 2 |
Vanguard Group
Malvern,
Pennsylvania
|
+$64.3M |
| 3 |
State Street
Boston,
Massachusetts
|
+$50.5M |
| 4 |
BlackRock
New York
|
+$50.5M |
| 5 |
CG
Carmignac Gestion
Paris,
France
|
+$49.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
-$55.5M |
| 2 |
FCMI
Foresite Capital Management IV
Larkspur,
California
|
-$24.3M |
| 3 |
TOCUITCONY
Trustees of Columbia University in the City of New York
New York
|
-$8.87M |
| 4 |
DM
Deerfield Management
New York
|
-$2.03M |
| 5 |
Millennium Management
New York
|
-$971K |
GBIO Hedge Fund Activity: Q1 2021 in Review
88 of the 5,696 institutional investors tracked by Wall St. Rank reported a position in Generation Bio (GBIO) for Q1 2021, worth a combined $1.27B — up 40% from $906M a quarter earlier.
Buyers outnumbered sellers: 30 funds opened new GBIO positions and 9 closed out — a net gain of 21 holders — while 44 added to existing stakes and 8 trimmed.
The largest buyer was T. Rowe Price Associates, adding an estimated $66.9M. The largest seller was Wellington Management Group, cutting an estimated $55.5M.
- 88 institutional investors held Generation Bio (GBIO) as of Q1 2021, up from 68 in Q4 2020.
- Funds reported $1.27B of Generation Bio stock for Q1 2021, up 40% quarter-over-quarter.
- 30 funds opened new Generation Bio positions in Q1 2021 and 9 closed out, a net change of +21 holders.
- The largest Generation Bio buyer in Q1 2021 was T. Rowe Price Associates, an estimated $66.9M added.
- The largest Generation Bio seller in Q1 2021 was Wellington Management Group, an estimated $55.5M sold.
Based on aggregated 13F filings for Q1 2021.