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Tandem Diabetes Care
TNDM

Overview Fund Activity

272 hedge funds and large institutions have $1.4B invested in Tandem Diabetes Care in 2025 Q1 according to their latest regulatory filings, with 39 funds opening new positions, 106 increasing their positions, 85 reducing their positions, and 78 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
272
Holders Change
-42
Holders Change %
-13.38%
% of All Funds
3.69%
Holding in Top 10
2
Holding in Top 10 Change
-3
Holding in Top 10 Change %
-60%
% of All Funds
0.03%
New
39
Increased
106
Reduced
85
Closed
78
Calls
$61.6M
Puts
$5.47M
Net Calls
+$56.1M
Net Calls Change
-$50.2M

Top Buyers

1
SC
Sessa Capital
New York
+$85.6M
2
HRCM
Hood River Capital Management
Florida
+$19.8M
3
Balyasny Asset Management
Balyasny Asset Management
Illinois
+$14.7M
4
GKIM
GW&K Investment Management
Massachusetts
+$14.2M
5
PIM
Paradice Investment Management
Colorado
+$13.3M

Top Sellers

1
GGHC
Gilder Gagnon Howe & Co
New York
-$33.6M
2
BG
Bellevue Group
Switzerland
-$28.2M
3
Capital International Investors
Capital International Investors
California
-$25.9M
4
OAM
Oberweis Asset Management
Illinois
-$18.2M
5
CC
Chicago Capital
Illinois
-$18.2M
Name Holding Trade Value Shares
Change 		Shares
Change %
Acadian Asset Management
51
Acadian Asset Management
Massachusetts
$4.46M +$4.46M +232,872 New
Millennium Management
52
Millennium Management
New York
$4.36M +$1.46M +76,245 +50%
BC
53
Beaconlight Capital
New York
$4.21M -$2.14M -111,452 -34%
Royal Bank of Canada
54
Royal Bank of Canada
Ontario, Canada
$4.05M +$946K +49,408 +30%
AG
55
Algert Global
California
$4.01M +$2.3M +119,784 +134%
Public Sector Pension Investment Board (PSP Investments)
56
Public Sector Pension Investment Board (PSP Investments)
Quebec, Canada
$3.99M +$847K +44,209 +27%
Prudential Financial
57
Prudential Financial
New Jersey
$3.82M -$62.6K -2,820 -2%
New York State Common Retirement Fund
58
New York State Common Retirement Fund
New York
$3.79M -$276K -14,391 -7%
UBS AM
59
UBS AM
Illinois
$3.72M +$311K +16,254 +9%
KBC Group
60
KBC Group
Belgium
$3.71M +$25.5K +1,329 +0.7%
Fidelity International
61
Fidelity International
Bermuda
$3.69M -$170K -8,882 -4%
EGM
62
Engineers Gate Manager
New York
$3.66M -$611K -31,900 -14%
KCM
63
Kennedy Capital Management
Missouri
$3.59M -$1.54M -80,212 -30%
Raymond James Financial
64
Raymond James Financial
Florida
$3.58M +$441K +23,014 +14%
Susquehanna International Group
65
Susquehanna International Group
Pennsylvania
$3.49M +$2.92M +152,181 +506%
AllianceBernstein
66
AllianceBernstein
Tennessee
$3.46M +$1.67M +86,901 +93%
SGA
67
Sector Gamma AS
Norway
$3.46M +$3.46M +180,523 New
RhumbLine Advisers
68
RhumbLine Advisers
Massachusetts
$3.42M -$8.28K -432 -0.2%
Legal & General Group
69
Legal & General Group
United Kingdom
$3.39M -$109K -5,668 -3%
DSCM
70
Divisadero Street Capital Management
Florida
$3.35M -$3.55M -185,540 -52%
IGAM
71
iA Global Asset Management
Quebec, Canada
$3.17M +$3.17M +165,380 New
State of Wisconsin Investment Board
72
State of Wisconsin Investment Board
Wisconsin
$2.99M +$263K +13,750 +10%
PCH
73
Polar Capital Holdings
United Kingdom
$2.69M -$45.3K -2,364 -2%
Russell Investments Group
74
Russell Investments Group
United Kingdom
$2.67M -$2.9M -151,134 -52%
Truist Financial
75
Truist Financial
North Carolina
$2.65M +$364K +18,986 +16%
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