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Tandem Diabetes Care
TNDM

Overview Fund Activity

268 hedge funds and large institutions have $1.51B invested in Tandem Diabetes Care in 2025 Q2 according to their latest regulatory filings, with 40 funds opening new positions, 116 increasing their positions, 69 reducing their positions, and 41 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
268
Holders Change
-4
Holders Change %
-1.47%
% of All Funds
3.59%
Holding in Top 10
2
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.03%
New
40
Increased
116
Reduced
69
Closed
41
Calls
$54.4M
Puts
$4.81M
Net Calls
+$49.6M
Net Calls Change
-$6.58M

Top Buyers

1
OAM
Ophir Asset Management
Australia
+$24.4M
2
Goldman Sachs
Goldman Sachs
New York
+$21.9M
3
Millennium Management
Millennium Management
New York
+$13.8M
4
Two Sigma Investments
Two Sigma Investments
New York
+$11M
5
Walleye Capital
Walleye Capital
New York
+$10.6M

Top Sellers

1
PWAM
Park West Asset Management
California
-$21.5M
2
Fidelity Investments
Fidelity Investments
Massachusetts
-$17M
3
FAM
Fred Alger Management
New York
-$14.7M
4
Balyasny Asset Management
Balyasny Asset Management
Illinois
-$10M
5
KCM
Kingdon Capital Management
New York
-$9.49M
Name Holding Trade Value Shares
Change 		Shares
Change %
1CM
76
1492 Capital Management
Wisconsin
$3.52M +$3.1M +166,308 +741%
SEI Investments
77
SEI Investments
Pennsylvania
$3.48M +$1.16M +62,375 +50%
Legal & General Group
78
Legal & General Group
United Kingdom
$3.45M +$147K +7,866 +4%
Squarepoint
79
Squarepoint
New York
$3.37M +$1.06M +56,777 +46%
DSCM
80
Divisadero Street Capital Management
Florida
$3.26M – – –
EGM
81
Engineers Gate Manager
New York
$3.18M -$381K -20,417 -11%
PP
82
PDT Partners
New York
$3.18M +$3.18M +170,420 New
JF
83
Jump Financial
Illinois
$3.04M +$3.04M +162,950 New
ACM
84
Aquatic Capital Management
Illinois
$3.02M +$2.6M +139,382 +615%
State of Wisconsin Investment Board
85
State of Wisconsin Investment Board
Wisconsin
$2.99M +$82.1K +4,407 +3%
Raymond James Financial
86
Raymond James Financial
Florida
$2.67M -$808K -43,354 -23%
MMA
87
Mizuho Markets Americas
New York
$2.59M +$428K +22,970 +20%
VOYA Investment Management
88
VOYA Investment Management
Georgia
$2.57M +$19.6K +1,051 +0.8%
Swiss National Bank
89
Swiss National Bank
Switzerland
$2.37M – – –
Truist Financial
90
Truist Financial
North Carolina
$2.3M -$280K -15,016 -11%
FG
91
Formula Growth
Quebec, Canada
$2.28M -$34.5K -1,849 -1%
HighTower Advisors
92
HighTower Advisors
Illinois
$2.26M +$1.01M +54,292 +81%
KCM
93
Kennedy Capital Management
Missouri
$2.19M -$1.29M -69,441 -37%
RHJA
94
Rice Hall James & Associates
California
$1.94M -$18.7K -1,002 -1%
Universal-Beteiligungs- und Servicegesellschaft
95
Universal-Beteiligungs- und Servicegesellschaft
Germany
$1.89M +$252K +13,523 +15%
BHCM
96
Brevan Howard Capital Management
Jersey
$1.77M +$1.56M +83,955 +779%
Jane Street
97
Jane Street
New York
$1.68M +$1.68M +90,108 New
Citigroup
98
Citigroup
New York
$1.62M -$262K -14,064 -14%
BPC
99
Banque Pictet & Cie
Switzerland
$1.57M +$1.57M +84,028 New
GAM
100
Gotham Asset Management
New York
$1.54M +$257K +13,803 +20%
2 3
4
5 6