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Tandem Diabetes Care
TNDM

Overview Fund Activity

266 hedge funds and large institutions have $1.5B invested in Tandem Diabetes Care in 2025 Q2 according to their latest regulatory filings, with 40 funds opening new positions, 115 increasing their positions, 68 reducing their positions, and 41 closing their positions.

Holders
266
Holders Change
-6
Holders Change %
-2.21%
% of All Funds
3.57%
Holding in Top 10
2
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.03%
New
40
Increased
115
Reduced
68
Closed
41
Calls
$53.9M
Puts
$4.33M
Net Calls
+$49.6M
Net Calls Change
-$6.58M

Top Buyers

1
OAM
1
Ophir Asset Management
Australia
$24.4M
2
Goldman Sachs
2
Goldman Sachs
New York
$35.2M
3
Millennium Management
3
Millennium Management
New York
$18.1M
4
Two Sigma Investments
4
Two Sigma Investments
New York
$23M
5
Walleye Capital
5
Walleye Capital
New York
$10.6M

Top Sellers

1
PWAM
1
Park West Asset Management
California
$0
2
Fidelity Investments
2
Fidelity Investments
Massachusetts
$9.78M
3
FAM
3
Fred Alger Management
New York
$12.4M
4
Balyasny Asset Management
4
Balyasny Asset Management
Illinois
$4.3M
5
KCM
5
Kingdon Capital Management
New York
$0
Name Market Value Shares Shares
Change 		Shares
Change %
SEI Investments
76
SEI Investments
Pennsylvania
$3.48M 186,731 +62,375 +50%
Legal & General Group
77
Legal & General Group
United Kingdom
$3.45M 184,853 +7,866 +4%
Squarepoint
78
Squarepoint
New York
$3.37M 180,660 +56,777 +46%
DSCM
79
Divisadero Street Capital Management
Florida
$3.26M 174,692 – –
EGM
80
Engineers Gate Manager
New York
$3.18M 170,488 -20,417 -11%
PP
81
PDT Partners
New York
$3.18M 170,420 +170,420 New
JF
82
Jump Financial
Illinois
$3.04M 162,950 +162,950 New
ACM
83
Aquatic Capital Management
Illinois
$3.02M 162,030 +139,382 +615%
State of Wisconsin Investment Board
84
State of Wisconsin Investment Board
Wisconsin
$2.99M 160,619 +4,407 +3%
Raymond James Financial
85
Raymond James Financial
Florida
$2.67M 143,274 -43,354 -23%
MMA
86
Mizuho Markets Americas
New York
$2.59M 138,742 +22,970 +20%
VOYA Investment Management
87
VOYA Investment Management
Georgia
$2.57M 137,749 +1,051 +0.8%
Swiss National Bank
88
Swiss National Bank
Switzerland
$2.37M 127,300 – –
Truist Financial
89
Truist Financial
North Carolina
$2.3M 123,531 -15,016 -11%
FG
90
Formula Growth
Quebec, Canada
$2.28M 122,096 -1,849 -1%
HighTower Advisors
91
HighTower Advisors
Illinois
$2.26M 121,460 +54,292 +81%
KCM
92
Kennedy Capital Management
Missouri
$2.19M 117,702 -69,441 -37%
RHJA
93
Rice Hall James & Associates
California
$1.94M 103,954 -1,002 -1%
Universal-Beteiligungs- und Servicegesellschaft
94
Universal-Beteiligungs- und Servicegesellschaft
Germany
$1.89M 101,346 +13,523 +15%
BHCM
95
Brevan Howard Capital Management
Jersey
$1.77M 94,734 +83,955 +779%
Jane Street
96
Jane Street
New York
$1.68M 90,108 +90,108 New
Citigroup
97
Citigroup
New York
$1.62M 87,125 -14,064 -14%
BPC
98
Banque Pictet & Cie
Switzerland
$1.57M 84,028 +84,028 New
GAM
99
Gotham Asset Management
New York
$1.54M 82,432 +13,803 +20%
Cerity Partners
100
Cerity Partners
New York
$1.53M 82,262 +6,257 +8%
2 3
4
5 6