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GBIO

Generation Bio
GBIO

Delisted

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

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79 hedge funds and large institutions have $315M invested in Generation Bio in 2023 Q2 according to their latest regulatory filings, with 9 funds opening new positions, 30 increasing their positions, 26 reducing their positions, and 13 closing their positions.

New
Increased
Maintained
Reduced
Closed

28% more capital invested

Capital invested by funds: $247M → $315M (+$68.4M)

15% more repeat investments, than reductions

Existing positions increased: 30 | Existing positions reduced: 26

0% more funds holding in top 10

Funds holding in top 10: 1 → 1 (0)

0.89% less ownership

Funds ownership: 9.62% → 8.72% (-0.89%)

5% less funds holding

Funds holding: 83 → 79 (-4)

15% less call options, than puts

Call options by funds: $29K | Put options by funds: $34K

31% less first-time investments, than exits

New positions opened: 9 | Existing positions closed: 13

Holders
79
Holders Change
-4
Holders Change %
-4.82%
% of All Funds
1.24%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.02%
New
9
Increased
30
Reduced
26
Closed
13
Calls
$29K
Puts
$34K
Net Calls
-$5K
Net Calls Change
-$130K

Top Buyers

Rank Fund Capital Flow
1
JP Morgan Chase
JP Morgan Chase
New York
+$2.01M
2
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$599K
3
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
+$457K
4
BlackRock
BlackRock
New York
+$416K
5
EC
EcoR1 Capital
California
+$414K

Top Sellers

Rank Fund Capital Flow
1
ACM
Atika Capital Management
New York
-$1.53M
2
Fidelity Investments
Fidelity Investments
Massachusetts
-$1.5M
3
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
-$688K
4
GCP
GSA Capital Partners
United Kingdom
-$564K
5
JFG
Jefferies Financial Group
New York
-$237K
Name Holding Trade Value Shares
Change 		Change in
Stake
Renaissance Technologies
26
Renaissance Technologies
New York
$1.7M +$96.8K +2,110 +7%
N
27
Nuveen
North Carolina
$1.5M -$38.1K -830 -3%
TD Asset Management
28
TD Asset Management
Ontario, Canada
$1.3M +$22K +480 +2%
Bank of New York Mellon
29
Bank of New York Mellon
New York
$915K +$23.1K +504 +3%
Manulife (Manufacturers Life Insurance)
30
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$837K -$2.02K -44 -0.3%
State of Wisconsin Investment Board
31
State of Wisconsin Investment Board
Wisconsin
$649K +$144K +3,140 +36%
MAM
32
Martingale Asset Management
Massachusetts
$409K – – –
Invesco
33
Invesco
Georgia
$406K -$3.21K -70 -0.9%
RhumbLine Advisers
34
RhumbLine Advisers
Massachusetts
$393K -$16K -348 -5%
AllianceBernstein
35
AllianceBernstein
Tennessee
$384K +$64.3K +1,401 +25%
Los Angeles Capital Management
36
Los Angeles Capital Management
California
$365K +$10.1K +220 +3%
Wellington Management Group
37
Wellington Management Group
Massachusetts
$308K +$257K +5,597 New
Squarepoint
38
Squarepoint
New York
$274K +$229K +4,984 New
CIC
39
Cornercap Investment Counsel
Georgia
$209K +$43.1K +939 +33%
D.E. Shaw & Co
40
D.E. Shaw & Co
New York
$199K -$212K -4,628 -56%
Marshall Wace
41
Marshall Wace
United Kingdom
$190K – – –
Citadel Advisors
42
Citadel Advisors
Florida
$178K +$148K +3,229 New
Millennium Management
43
Millennium Management
New York
$161K -$46.5K -1,013 -26%
SFG
44
SVB Financial Group
Texas
$153K -$57.5K -1,252 -31%
Two Sigma Advisers
45
Two Sigma Advisers
New York
$151K +$8.26K +180 +7%
MIM
46
MetLife Investment Management
New Jersey
$132K +$37.5K +818 +52%
PP
47
PDT Partners
New York
$122K -$38.9K -848 -28%
AIG
48
American International Group
New York
$120K -$6.47K -141 -6%
Mirae Asset Global Investments
49
Mirae Asset Global Investments
South Korea
$109K +$46 +1 +0.1%
Wells Fargo
50
Wells Fargo
California
$107K +$40.2K +875 +82%
1
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GBIO Hedge Fund Activity: Q2 2023 in Review

79 of the 6,371 institutional investors tracked by Wall St. Rank reported a position in Generation Bio (GBIO) for Q2 2023, worth a combined $315M — up 28% from $247M a quarter earlier.

Sellers outnumbered buyers: 13 funds closed out of GBIO and 9 opened new positions — a net loss of 4 holders — while 26 trimmed existing stakes and 30 added.

The largest buyer was JP Morgan Chase, adding an estimated $2.01M. The largest seller was Atika Capital Management, exiting entirely with an estimated $1.53M sold.

  • 79 institutional investors held Generation Bio (GBIO) as of Q2 2023, down from 83 in Q1 2023.
  • Funds reported $315M of Generation Bio stock for Q2 2023, up 28% quarter-over-quarter.
  • 9 funds opened new Generation Bio positions in Q2 2023 and 13 closed out, a net change of -4 holders.
  • The largest Generation Bio buyer in Q2 2023 was JP Morgan Chase, an estimated $2.01M added.
  • The largest Generation Bio seller in Q2 2023 was Atika Capital Management, an estimated $1.53M sold.

Based on aggregated 13F filings for Q2 2023.