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GBIO

Generation Bio
GBIO

Delisted

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

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88 hedge funds and large institutions have $390M invested in Generation Bio in 2021 Q4 according to their latest regulatory filings, with 22 funds opening new positions, 29 increasing their positions, 23 reducing their positions, and 14 closing their positions.

New
Increased
Maintained
Reduced
Closed

57% more first-time investments, than exits

New positions opened: 22 | Existing positions closed: 14

26% more repeat investments, than reductions

Existing positions increased: 29 | Existing positions reduced: 23

21% more call options, than puts

Call options by funds: $110K | Put options by funds: $91K

9% more funds holding

Funds holding: 81 → 88 (+7)

1.21% more ownership

Funds ownership: 8.45% → 9.66% (+1.2%)

68% less capital invested

Capital invested by funds: $1.2B → $390M (-$813M)

Holders
88
Holders Change
+7
Holders Change %
+8.64%
% of All Funds
1.35%
Holding in Top 10
1
Holding in Top 10 Change
+1
Holding in Top 10 Change %
% of All Funds
0.02%
New
22
Increased
29
Reduced
23
Closed
14
Calls
$110K
Puts
$91K
Net Calls
+$19K
Net Calls Change
+$2.7M

Top Buyers

Rank Fund Capital Flow
1
BG
Bellevue Group
Switzerland
+$24.4M
2
Millennium Management
Millennium Management
New York
+$9.4M
3
YCM
Yiheng Capital Management
California
+$6.55M
4
Two Sigma Investments
Two Sigma Investments
New York
+$4.24M
5
Renaissance Technologies
Renaissance Technologies
New York
+$4M

Top Sellers

Rank Fund Capital Flow
1
CG
Carmignac Gestion
France
-$36.9M
2
JP Morgan Chase
JP Morgan Chase
New York
-$21.8M
3
Victory Capital Management
Victory Capital Management
Texas
-$20.5M
4
Ensign Peak Advisors
Ensign Peak Advisors
Utah
-$10.8M
5
Goldman Sachs
Goldman Sachs
New York
-$4.85M
Name Holding Trade Value Shares
Change 		Change in
Stake
D.E. Shaw & Co
26
D.E. Shaw & Co
New York
$1.14M +$2.65M +15,203 +1,819%
Deutsche Bank
27
Deutsche Bank
Germany
$1.08M -$87.5K -501 -3%
Dimensional Fund Advisors
28
Dimensional Fund Advisors
Texas
$935K +$1.28M +7,328 +125%
Rafferty Asset Management
29
Rafferty Asset Management
New York
$811K +$947K +5,424 +90%
Citigroup
30
Citigroup
New York
$798K +$853K +4,885 +77%
UBS Group
31
UBS Group
Switzerland
$774K +$1.91M +10,933 New
Victory Capital Management
32
Victory Capital Management
Texas
$683K -$20.5M -117,698 -92%
Swiss National Bank
33
Swiss National Bank
Switzerland
$576K – – –
Two Sigma Advisers
34
Two Sigma Advisers
New York
$552K +$1.36M +7,790 New
Goldman Sachs
35
Goldman Sachs
New York
$503K -$4.85M -27,804 -80%
HF
36
HRT Financial
New York
$471K +$1.16M +6,655 New
Walleye Capital
37
Walleye Capital
New York
$440K +$1.08M +6,214 New
California State Teachers Retirement System (CalSTRS)
38
California State Teachers Retirement System (CalSTRS)
California
$390K +$22K +126 +2%
Marshall Wace
39
Marshall Wace
United Kingdom
$385K +$301K +1,726 +46%
State of Wisconsin Investment Board
40
State of Wisconsin Investment Board
Wisconsin
$384K – – –
AllianceBernstein
41
AllianceBernstein
Tennessee
$326K – – –
RhumbLine Advisers
42
RhumbLine Advisers
Massachusetts
$311K -$21.5K -123 -3%
Nomura Holdings
43
Nomura Holdings
Japan
$308K +$760K +4,353 New
Susquehanna International Group
44
Susquehanna International Group
Pennsylvania
$291K +$170K +972 +31%
CSS
45
Cubist Systematic Strategies
Connecticut
$272K +$446K +2,554 +198%
PP
46
PDT Partners
New York
$261K +$643K +3,684 New
ECM
47
ExodusPoint Capital Management
New York
$236K +$581K +3,327 New
New York State Common Retirement Fund
48
New York State Common Retirement Fund
New York
$223K -$2.44K -14 -0.4%
JF
49
Jump Financial
Illinois
$203K +$501K +2,870 New
Citadel Advisors
50
Citadel Advisors
Florida
$203K +$501K +2,871 New
1
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3 4 5

GBIO Hedge Fund Activity: Q4 2021 in Review

88 of the 6,499 institutional investors tracked by Wall St. Rank reported a position in Generation Bio (GBIO) for Q4 2021, worth a combined $390M — down 68% from $1.2B a quarter earlier.

Buyers outnumbered sellers: 22 funds opened new GBIO positions and 14 closed out — a net gain of 8 holders — while 29 added to existing stakes and 23 trimmed.

The largest buyer was Bellevue Group, adding an estimated $24.4M. The largest seller was Carmignac Gestion, exiting entirely with an estimated $36.9M sold.

  • 88 institutional investors held Generation Bio (GBIO) as of Q4 2021, up from 81 in Q3 2021.
  • Funds reported $390M of Generation Bio stock for Q4 2021, down 68% quarter-over-quarter.
  • 22 funds opened new Generation Bio positions in Q4 2021 and 14 closed out, a net change of +8 holders.
  • The largest Generation Bio buyer in Q4 2021 was Bellevue Group, an estimated $24.4M added.
  • The largest Generation Bio seller in Q4 2021 was Carmignac Gestion, an estimated $36.9M sold.

Based on aggregated 13F filings for Q4 2021.