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GBIO

Generation Bio
GBIO

Delisted

GBIO was delisted on the 6th of February, 2026.

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81 hedge funds and large institutions have $1.2B invested in Generation Bio in 2021 Q3 according to their latest regulatory filings, with 9 funds opening new positions, 32 increasing their positions, 25 reducing their positions, and 24 closing their positions.

New
Increased
Maintained
Reduced
Closed

28% more repeat investments, than reductions

Existing positions increased: 32 | Existing positions reduced: 25

0.24% more ownership

Funds ownership: 8.21% → 8.45% (+0.24%)

4% less capital invested

Capital invested by funds: $1.25B → $1.2B (-$45.6M)

16% less funds holding

Funds holding: 97 → 81 (-16)

63% less first-time investments, than exits

New positions opened: 9 | Existing positions closed: 24

93% less call options, than puts

Call options by funds: $216K | Put options by funds: $2.9M

Holders
81
Holders Change
-16
Holders Change %
-16.49%
% of All Funds
1.42%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
9
Increased
32
Reduced
25
Closed
24
Calls
$216K
Puts
$2.9M
Net Calls
-$2.68M
Net Calls Change
+$391K

Top Buyers

Rank Fund Capital Flow
1
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
+$30.3M
2
MWNA
Marshall Wace North America
New York
+$9.54M
3
JP Morgan Chase
JP Morgan Chase
New York
+$8.23M
4
Vanguard Group
Vanguard Group
Pennsylvania
+$7.8M
5
BlackRock
BlackRock
New York
+$6.58M

Top Sellers

Rank Fund Capital Flow
1
State Street
State Street
Massachusetts
-$10.3M
2
CC
Casdin Capital
New York
-$6.87M
3
American Century Companies
American Century Companies
Missouri
-$6.63M
4
AIC
AWM Investment Company
New York
-$6.07M
5
D.E. Shaw & Co
D.E. Shaw & Co
New York
-$2.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
ProShare Advisors
51
ProShare Advisors
Maryland
$445K -$91K -380 -18%
VOYA Investment Management
52
VOYA Investment Management
Georgia
$433K – – –
DekaBank Deutsche Girozentrale
53
DekaBank Deutsche Girozentrale
Germany
$415K – – –
Legal & General Group
54
Legal & General Group
United Kingdom
$414K +$170K +709 +75%
MIM
55
MetLife Investment Management
New Jersey
$391K – – –
MAM
56
Martingale Asset Management
Massachusetts
$360K +$343K +1,432 New
CSS
57
Cubist Systematic Strategies
Connecticut
$323K +$308K +1,288 New
MLICM
58
Metropolitan Life Insurance Company (MetLife)
New York
$300K +$287K +1,198 New
PPA
59
Parametric Portfolio Associates
Washington
$300K -$18.7K -78 -6%
ASRS
60
Arizona State Retirement System
Arizona
$251K +$4.55K +19 +2%
Handelsbanken Fonder
61
Handelsbanken Fonder
Sweden
$238K – – –
D.E. Shaw & Co
62
D.E. Shaw & Co
New York
$210K -$2.8M -11,679 -93%
State Board of Administration of Florida Retirement System
63
State Board of Administration of Florida Retirement System
Florida
$201K +$1.44K +6 +0.8%
Royal Bank of Canada
64
Royal Bank of Canada
Ontario, Canada
$143K +$31.6K +132 +30%
TRCT
65
Tower Research Capital (TRC)
New York
$113K +$40.9K +171 +61%
TIM
66
Tortoise Investment Management
New York
$83K – – –
AIP
67
Ameritas Investment Partners
Nebraska
$82K – – –
Canada Life
68
Canada Life
Manitoba, Canada
$47K – – –
PCM
69
Penserra Capital Management
California
$32K +$239 +1 +0.8%
CLOS
70
Compagnie Lombard Odier SCmA
Switzerland
$27K – – –
MCM
71
Manchester Capital Management
Vermont
$25K +$23.9K +100 New
RFWA
72
RPg Family Wealth Advisory
Massachusetts
$19K – – –
Wells Fargo
73
Wells Fargo
California
$17K +$12K +50 +263%
Macquarie Group
74
Macquarie Group
Australia
$12K – – –
QT
75
Quantbot Technologies
New York
$12K +$12K +50 New
1 2
3
4 5

GBIO Hedge Fund Activity: Q3 2021 in Review

81 of the 5,713 institutional investors tracked by Wall St. Rank reported a position in Generation Bio (GBIO) for Q3 2021, worth a combined $1.2B — down 3.7% from $1.25B a quarter earlier.

Sellers outnumbered buyers: 24 funds closed out of GBIO and 9 opened new positions — a net loss of 15 holders — while 25 trimmed existing stakes and 32 added.

The largest buyer was T. Rowe Price Associates, adding an estimated $30.3M. The largest seller was State Street, cutting an estimated $10.3M.

  • 81 institutional investors held Generation Bio (GBIO) as of Q3 2021, down from 97 in Q2 2021.
  • Funds reported $1.2B of Generation Bio stock for Q3 2021, down 3.7% quarter-over-quarter.
  • 9 funds opened new Generation Bio positions in Q3 2021 and 24 closed out, a net change of -15 holders.
  • The largest Generation Bio buyer in Q3 2021 was T. Rowe Price Associates, an estimated $30.3M added.
  • The largest Generation Bio seller in Q3 2021 was State Street, an estimated $10.3M sold.

Based on aggregated 13F filings for Q3 2021.