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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 %
California State Teachers Retirement System (CalSTRS)
101
California State Teachers Retirement System (CalSTRS)
California
$1.17M – – –
SCM
102
Semanteon Capital Management
Massachusetts
$1.06M +$1.06M +55,413 New
Deutsche Bank
103
Deutsche Bank
Germany
$1.04M -$146K -7,607 -12%
Canada Life
104
Canada Life
Manitoba, Canada
$1.02M -$170K -8,895 -14%
LPL Financial
105
LPL Financial
California
$1.02M +$100K +5,236 +11%
T. Rowe Price Associates
106
T. Rowe Price Associates
Maryland
$1.01M +$40.3K +2,103 +4%
JC
107
JB Capital
Connecticut
$992K +$241K +12,565 +32%
Group One Trading
108
Group One Trading
Illinois
$986K +$956K +49,871 +3,139%
IIM
109
INTECH Investment Management
Florida
$967K +$418K +21,821 +76%
Thrivent Financial for Lutherans
110
Thrivent Financial for Lutherans
Minnesota
$924K -$48.3K -2,524 -5%
BCI
111
Brinker Capital Investments
Pennsylvania
$902K +$326K +17,014 +57%
OPS
112
Orion Portfolio Solutions
Nebraska
$902K +$326K +17,014 +57%
US Bancorp
113
US Bancorp
Minnesota
$818K +$76.3K +3,980 +10%
First Trust Advisors
114
First Trust Advisors
Illinois
$764K -$729K -38,025 -49%
MIM
115
MetLife Investment Management
New Jersey
$749K -$11.4K -597 -2%
Capital Fund Management (CFM)
116
Capital Fund Management (CFM)
France
$745K -$3.09M -161,420 -81%
Janney Montgomery Scott
117
Janney Montgomery Scott
Pennsylvania
$737K +$157K +8,210 +27%
PCM
118
Prelude Capital Management
New York
$731K -$1.14M -59,531 -61%
SOADOR
119
State of Alaska Department of Revenue
Alaska
$697K -$17.9K -935 -3%
Mirae Asset Global Investments
120
Mirae Asset Global Investments
South Korea
$692K -$5.1M -265,554 -88%
LCM
121
Landscape Capital Management
New Jersey
$689K +$312K +16,307 +83%
Stifel Financial
122
Stifel Financial
Missouri
$676K +$10K +522 +2%
CF
123
Corebridge Financial
Texas
$657K -$12.9K -672 -2%
Manulife (Manufacturers Life Insurance)
124
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$628K -$42.9K -2,238 -6%
Teacher Retirement System of Texas
125
Teacher Retirement System of Texas
Texas
$622K +$93.8K +4,895 +18%
3 4
5
6 7