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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 %
NS
301
NBC Securities
Alabama
– -$37K -1,945 Closed
MG
302
Mather Group
Illinois
– -$6.61K -345 Closed
SO
303
Sierra Ocean
California
– -$2.97K -155 Closed
CA
304
Continuum Advisory
Idaho
– -$1.92K -100 Closed
CWM
305
CarsonAllaria Wealth Management
Illinois
– -$1.44K -75 Closed
BCWM
306
Bartlett & Co Wealth Management
Ohio
– -$1.19K -62 Closed
QC
307
Quent Capital
New York
– -$1.15K -60 Closed
1IA
308
1620 Investment Advisors
Massachusetts
– -$479 -25 Closed
SC
309
Stephens Consulting
Michigan
– -$384 -20 Closed
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