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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 %
QCM
51
Quantinno Capital Management
New York
$5.96M +$1.45M +77,828 +32%
Tudor Investment Corp
52
Tudor Investment Corp
Connecticut
$5.81M -$1.75M -93,775 -23%
DCM
53
DAFNA Capital Management
California
$5.48M – – –
Envestnet Asset Management
54
Envestnet Asset Management
Illinois
$5.18M -$755K -40,520 -13%
AllianceBernstein
55
AllianceBernstein
Tennessee
$5.04M +$1.67M +89,631 +50%
UBS AM
56
UBS AM
Illinois
$5.01M +$1.4M +74,910 +39%
EDRH
57
Edmond de Rothschild Holding
Switzerland
$4.89M +$186K +10,000 +4%
Capital Fund Management (CFM)
58
Capital Fund Management (CFM)
France
$4.89M +$4.17M +223,574 +575%
Susquehanna International Group
59
Susquehanna International Group
Pennsylvania
$4.8M +$1.4M +75,208 +41%
LCG
60
Lisanti Capital Growth
New York
$4.73M +$4.73M +253,840 New
Adage Capital Partners
61
Adage Capital Partners
Massachusetts
$4.66M +$4.66M +250,000 New
SPS
62
Susquehanna Portfolio Strategies
Pennsylvania
$4.6M +$4.6M +246,989 New
Balyasny Asset Management
63
Balyasny Asset Management
Illinois
$4.3M -$10M -538,809 -70%
Public Sector Pension Investment Board (PSP Investments)
64
Public Sector Pension Investment Board (PSP Investments)
Quebec, Canada
$4.23M +$352K +18,873 +9%
Invesco
65
Invesco
Georgia
$4.23M -$193K -10,333 -4%
Verition Fund Management
66
Verition Fund Management
Connecticut
$4.07M +$3.52M +188,668 +631%
SGA
67
Sector Gamma AS
Norway
$3.92M +$559K +30,000 +17%
Bank of Montreal
68
Bank of Montreal
Ontario, Canada
$3.92M +$3.71M +198,942 +1,747%
SCM
69
Soleus Capital Management
Connecticut
$3.73M -$5.52M -296,039 -60%
SSA
70
Schonfeld Strategic Advisors
New York
$3.72M +$3.72M +199,756 New
Russell Investments Group
71
Russell Investments Group
United Kingdom
$3.7M +$1.11M +59,619 +43%
New York State Common Retirement Fund
72
New York State Common Retirement Fund
New York
$3.69M – – –
RhumbLine Advisers
73
RhumbLine Advisers
Massachusetts
$3.6M +$279K +14,945 +8%
KBC Group
74
KBC Group
Belgium
$3.58M -$36.7K -1,971 -1%
Fidelity International
75
Fidelity International
Bermuda
$3.57M -$20.1K -1,077 -0.6%
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