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GBIO

Generation Bio
GBIO

Delisted

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

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75 hedge funds and large institutions have $217M invested in Generation Bio in 2023 Q3 according to their latest regulatory filings, with 3 funds opening new positions, 25 increasing their positions, 26 reducing their positions, and 7 closing their positions.

New
Increased
Maintained
Reduced
Closed

41% more call options, than puts

Call options by funds: $24K | Put options by funds: $17K

0% more funds holding in top 10

Funds holding in top 10: 1 → 1 (0)

0.05% less ownership

Funds ownership: 8.72% → 8.68% (-0.05%)

4% less repeat investments, than reductions

Existing positions increased: 25 | Existing positions reduced: 26

5% less funds holding

Funds holding: 79 → 75 (-4)

31% less capital invested

Capital invested by funds: $315M → $217M (-$98.3M)

57% less first-time investments, than exits

New positions opened: 3 | Existing positions closed: 7

Holders
75
Holders Change
-4
Holders Change %
-5.06%
% of All Funds
1.19%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.02%
New
3
Increased
25
Reduced
26
Closed
7
Calls
$24K
Puts
$17K
Net Calls
+$7K
Net Calls Change
+$12K

Top Buyers

Rank Fund Capital Flow
1
JP Morgan Chase
JP Morgan Chase
New York
+$2.41M
2
TD Asset Management
TD Asset Management
Ontario, Canada
+$807K
3
Wellington Management Group
Wellington Management Group
Massachusetts
+$569K
4
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
+$554K
5
Vanguard Group
Vanguard Group
Pennsylvania
+$377K

Top Sellers

Rank Fund Capital Flow
1
HMC
Harvard Management Company
Massachusetts
-$2.81M
2
Fidelity Investments
Fidelity Investments
Massachusetts
-$899K
3
BlackRock
BlackRock
New York
-$868K
4
PHS
PFM Health Sciences
California
-$393K
5
N
Nuveen
North Carolina
-$218K
Name Holding Trade Value Shares
Change 		Change in
Stake
Renaissance Technologies
26
Renaissance Technologies
New York
$1.19M +$31.7K +670 +2%
N
27
Nuveen
North Carolina
$858K -$218K -4,595 -17%
Wellington Management Group
28
Wellington Management Group
Massachusetts
$668K +$569K +12,020 +215%
Bank of New York Mellon
29
Bank of New York Mellon
New York
$605K -$32.5K -686 -4%
Manulife (Manufacturers Life Insurance)
30
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$577K – – –
State of Wisconsin Investment Board
31
State of Wisconsin Investment Board
Wisconsin
$422K -$31.7K -670 -6%
Invesco
32
Invesco
Georgia
$282K +$2.42K +51 +0.7%
MAM
33
Martingale Asset Management
Massachusetts
$282K – – –
RhumbLine Advisers
34
RhumbLine Advisers
Massachusetts
$271K -$237 -5 -0.1%
AllianceBernstein
35
AllianceBernstein
Tennessee
$268K +$4.78K +101 +1%
Los Angeles Capital Management
36
Los Angeles Capital Management
California
$252K – – –
Squarepoint
37
Squarepoint
New York
$207K +$22.1K +467 +9%
GCP
38
GSA Capital Partners
United Kingdom
$160K +$200K +4,232 New
CIC
39
Cornercap Investment Counsel
Georgia
$143K -$1.8K -38 -1%
Marshall Wace
40
Marshall Wace
United Kingdom
$131K – – –
American Century Companies
41
American Century Companies
Missouri
$117K +$62K +1,310 +74%
Millennium Management
42
Millennium Management
New York
$116K +$7.01K +148 +5%
SFG
43
SVB Financial Group
Texas
$94.9K -$13.5K -285 -10%
D.E. Shaw & Co
44
D.E. Shaw & Co
New York
$94.7K -$53.3K -1,125 -31%
MIM
45
MetLife Investment Management
New Jersey
$91.1K – – –
AIG
46
American International Group
New York
$85.7K +$3.79K +80 +4%
Mirae Asset Global Investments
47
Mirae Asset Global Investments
South Korea
$75.1K +$331 +7 +0.4%
PP
48
PDT Partners
New York
$75K -$11.4K -241 -11%
Deutsche Bank
49
Deutsche Bank
Germany
$72.8K – – –
VOYA Investment Management
50
VOYA Investment Management
Georgia
$71.6K – – –
1
2
3 4

GBIO Hedge Fund Activity: Q3 2023 in Review

75 of the 6,303 institutional investors tracked by Wall St. Rank reported a position in Generation Bio (GBIO) for Q3 2023, worth a combined $217M — down 31% from $315M a quarter earlier.

Sellers outnumbered buyers: 7 funds closed out of GBIO and 3 opened new positions — a net loss of 4 holders — while 26 trimmed existing stakes and 25 added.

The largest buyer was JP Morgan Chase, adding an estimated $2.41M. The largest seller was Harvard Management Company, exiting entirely with an estimated $2.81M sold.

  • 75 institutional investors held Generation Bio (GBIO) as of Q3 2023, down from 79 in Q2 2023.
  • Funds reported $217M of Generation Bio stock for Q3 2023, down 31% quarter-over-quarter.
  • 3 funds opened new Generation Bio positions in Q3 2023 and 7 closed out, a net change of -4 holders.
  • The largest Generation Bio buyer in Q3 2023 was JP Morgan Chase, an estimated $2.41M added.
  • The largest Generation Bio seller in Q3 2023 was Harvard Management Company, an estimated $2.81M sold.

Based on aggregated 13F filings for Q3 2023.