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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
$35.2M
3
Millennium Management
Millennium Management
New York
$18.1M
4
Two Sigma Investments
Two Sigma Investments
New York
$23M
5
Walleye Capital
Walleye Capital
New York
$10.6M

Top Sellers

1
PWAM
Park West Asset Management
California
$0
2
Fidelity Investments
Fidelity Investments
Massachusetts
$9.78M
3
FAM
Fred Alger Management
New York
$12.4M
4
Balyasny Asset Management
Balyasny Asset Management
Illinois
$4.3M
5
KCM
Kingdon Capital Management
New York
$0
Name Holding Trade Value Shares
Change 		Shares
Change %
BlackRock
1
BlackRock
New York
$203M -$2.93M -157,154 -1%
Vanguard Group
2
Vanguard Group
Pennsylvania
$137M +$1.45M +77,661 +1%
SC
3
Sessa Capital
New York
$93.2M +$9.95M +533,693 +12%
GKIM
4
GW&K Investment Management
Massachusetts
$53.9M +$487K +26,143 +0.9%
ACH
5
ArrowMark Colorado Holdings
Colorado
$50.3M -$313K -16,783 -0.6%
State Street
6
State Street
Massachusetts
$49.3M -$780K -41,850 -2%
HRCM
7
Hood River Capital Management
Florida
$47.8M +$4.71M +252,934 +11%
Goldman Sachs
8
Goldman Sachs
New York
$35.2M +$21.9M +1,173,916 +165%
PIM
9
Paradice Investment Management
Colorado
$32.9M +$2.19M +117,272 +7%
SIMG
10
Stephens Investment Management Group
Texas
$32.4M +$575K +30,854 +2%
Jennison Associates
11
Jennison Associates
New York
$30.9M +$3.39M +181,834 +12%
Geode Capital Management
12
Geode Capital Management
Massachusetts
$29.9M +$916K +49,126 +3%
CIP
13
Champlain Investment Partners
Vermont
$27.1M +$1.61M +86,235 +6%
Jacobs Levy Equity Management
14
Jacobs Levy Equity Management
New Jersey
$26.7M -$750K -40,262 -3%
UBS Group
15
UBS Group
Switzerland
$25.8M +$10.2M +548,252 +66%
OAM
16
Ophir Asset Management
Australia
$24.4M +$24.4M +1,464,956 New
Morgan Stanley
17
Morgan Stanley
New York
$23.6M +$6.24M +334,565 +36%
Two Sigma Investments
18
Two Sigma Investments
New York
$23M +$11M +591,285 +92%
Baillie Gifford & Co
19
Baillie Gifford & Co
United Kingdom
$21M +$7.33M +393,154 +54%
Brown Advisory
20
Brown Advisory
Maryland
$19.7M +$2.46M +131,805 +14%
Millennium Management
21
Millennium Management
New York
$18.1M +$13.8M +741,488 +326%
Two Sigma Advisers
22
Two Sigma Advisers
New York
$16.6M +$3.89M +208,500 +31%
Connor, Clark & Lunn Investment Management (CC&L)
23
Connor, Clark & Lunn Investment Management (CC&L)
British Columbia, Canada
$14.6M +$2.6M +139,230 +22%
Capital World Investors
24
Capital World Investors
California
$14.3M – – –
Northern Trust
25
Northern Trust
Illinois
$13.1M +$202K +10,847 +2%
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