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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 %
VOYA Investment Management
76
VOYA Investment Management
Georgia
$2.62M +$738K +38,519 +39%
GCP
77
GSA Capital Partners
United Kingdom
$2.5M +$2.5M +130,595 New
Swiss National Bank
78
Swiss National Bank
Switzerland
$2.44M -$26.8K -1,400 -1%
SEI Investments
79
SEI Investments
Pennsylvania
$2.38M +$10.5K +549 +0.4%
FG
80
Formula Growth
Quebec, Canada
$2.37M -$38.7K -2,020 -2%
Squarepoint
81
Squarepoint
New York
$2.37M +$1.16M +60,564 +96%
MMA
82
Mizuho Markets Americas
New York
$2.22M +$588K +30,680 +36%
Citadel Advisors
83
Citadel Advisors
Florida
$2.18M -$341K -17,792 -13%
RHJA
84
Rice Hall James & Associates
California
$2.01M -$10.1K -526 -0.5%
MCM
85
Moore Capital Management
New York
$2M +$1.6M +83,453 +397%
Citigroup
86
Citigroup
New York
$1.94M +$115K +5,976 +6%
Universal-Beteiligungs- und Servicegesellschaft
87
Universal-Beteiligungs- und Servicegesellschaft
Germany
$1.68M +$1.68M +87,823 New
JAM
88
Jupiter Asset Management
United Kingdom
$1.68M +$1.68M +87,815 New
MP
89
Mangrove Partners
Connecticut
$1.58M +$645K +33,687 +69%
Cerity Partners
90
Cerity Partners
New York
$1.46M +$355K +18,529 +32%
Mirae Asset Global ETFs Holdings
91
Mirae Asset Global ETFs Holdings
Hong Kong
$1.43M +$40.2K +2,096 +3%
OAM
92
Oppenheimer Asset Management
New York
$1.39M +$212K +11,048 +18%
Marshall Wace
93
Marshall Wace
United Kingdom
$1.35M -$16.9M -880,549 -93%
DFCM
94
Dark Forest Capital Management
Puerto Rico
$1.34M +$1.34M +70,128 New
GAM
95
Gotham Asset Management
New York
$1.31M -$905K -47,247 -41%
New York State Teachers Retirement System (NYSTRS)
96
New York State Teachers Retirement System (NYSTRS)
New York
$1.31M – – –
HighTower Advisors
97
HighTower Advisors
Illinois
$1.29M +$1.1M +57,635 +605%
Wells Fargo
98
Wells Fargo
California
$1.28M +$108K +5,655 +9%
Natixis Advisors
99
Natixis Advisors
Massachusetts
$1.26M -$2.01K -105 -0.2%
HSA
100
Hussman Strategic Advisors
Maryland
$1.21M +$1.21M +63,000 New
2 3
4
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