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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.

Holders
268
Holders Change
-4
Holders Change %
-1.47%
% of All Funds
3.6%
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
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 Holding Trade Value Shares
Change 		Shares
Change %
Cetera Investment Advisers
176
Cetera Investment Advisers
Illinois
$274K -$74.1K -3,977 -21%
KK
177
KLP Kapitalforvaltning
Norway
$252K – – –
CC
178
Corton Capital
Ontario, Canada
$243K +$243K +13,038 New
Arrowstreet Capital
179
Arrowstreet Capital
Massachusetts
$231K +$231K +12,411 New
N
180
Natixis
France
$227K +$227K +12,200 New
Victory Capital Management
181
Victory Capital Management
Texas
$227K -$1.58K -85 -0.7%
IEFM
182
IQ EQ Fund Management
Ireland
$221K – – –
AWM
183
Apollon Wealth Management
South Carolina
$212K +$5.44K +292 +3%
PAS
184
Park Avenue Securities
New York
$204K -$14.4K -770 -7%
Simplex Trading
185
Simplex Trading
Illinois
$194K +$166K +8,931 +594%
Osaic Holdings
186
Osaic Holdings
Arizona
$192K -$131K -3,708 -41%
VF
187
Virtu Financial
New York
$189K +$189K +10,138 New
Amundi
188
Amundi
France
$188K -$242K -14,162 -56%
ASN
189
Advisory Services Network
Georgia
$179K +$179K +11,461 New
BC
190
Bayforest Capital
United Kingdom
$173K -$317K -17,017 -65%
TRCT
191
Tower Research Capital (TRC)
New York
$171K +$117K +6,290 +219%
Public Employees Retirement Association of Colorado
192
Public Employees Retirement Association of Colorado
Colorado
$143K – – –
AIP
193
Ameritas Investment Partners
Nebraska
$128K – – –
VanEck Associates
194
VanEck Associates
New York
$122K -$16K -857 -12%
SSG
195
Summit Securities Group
New York
$115K +$115K +6,160 New
Walleye Trading
196
Walleye Trading
New York
$115K +$115K +6,143 New
BIG
197
Brooklyn Investment Group
New York
$88.2K +$24.9K +1,336 +39%
Nisa Investment Advisors
198
Nisa Investment Advisors
Missouri
$77.7K +$50.6K +2,717 +187%
Lazard Asset Management
199
Lazard Asset Management
New York
$54K +$4.82K +260 +10%
Carson Wealth (CWM LLC)
200
Carson Wealth (CWM LLC)
Nebraska
$52K +$37.7K +2,025 +263%
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