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Tandem Diabetes Care
TNDM

Overview Fund Activity

272 hedge funds and large institutions have $1.4B invested in Tandem Diabetes Care in 2025 Q1 according to their latest regulatory filings, with 39 funds opening new positions, 106 increasing their positions, 85 reducing their positions, and 78 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
272
Holders Change
-42
Holders Change %
-13.38%
% of All Funds
3.69%
Holding in Top 10
2
Holding in Top 10 Change
-3
Holding in Top 10 Change %
-60%
% of All Funds
0.03%
New
39
Increased
106
Reduced
85
Closed
78
Calls
$61.6M
Puts
$5.47M
Net Calls
+$56.1M
Net Calls Change
-$50.2M

Top Buyers

1
SC
Sessa Capital
New York
+$85.6M
2
HRCM
Hood River Capital Management
Florida
+$19.8M
3
Balyasny Asset Management
Balyasny Asset Management
Illinois
+$14.7M
4
GKIM
GW&K Investment Management
Massachusetts
+$14.2M
5
PIM
Paradice Investment Management
Colorado
+$13.3M

Top Sellers

1
GGHC
Gilder Gagnon Howe & Co
New York
-$33.6M
2
BG
Bellevue Group
Switzerland
-$28.2M
3
Capital International Investors
Capital International Investors
California
-$25.9M
4
OAM
Oberweis Asset Management
Illinois
-$18.2M
5
CC
Chicago Capital
Illinois
-$18.2M
Name Holding Trade Value Shares
Change 		Shares
Change %
BlackRock
1
BlackRock
New York
$211M -$12.8M -669,112 -6%
Vanguard Group
2
Vanguard Group
Pennsylvania
$140M -$2.83M -147,836 -2%
SC
3
Sessa Capital
New York
$85.6M +$85.6M +4,466,307 New
GKIM
4
GW&K Investment Management
Massachusetts
$54.9M +$14.2M +740,499 +35%
ACH
5
ArrowMark Colorado Holdings
Colorado
$52M -$141K -7,383 -0.3%
State Street
6
State Street
Massachusetts
$51.5M -$1.48M -77,398 -3%
HRCM
7
Hood River Capital Management
Florida
$44.3M +$19.8M +1,033,997 +81%
SIMG
8
Stephens Investment Management Group
Texas
$32.7M +$2.9M +151,106 +10%
PIM
9
Paradice Investment Management
Colorado
$31.6M +$13.3M +693,500 +73%
Geode Capital Management
10
Geode Capital Management
Massachusetts
$29.8M +$448K +23,382 +2%
Jennison Associates
11
Jennison Associates
New York
$28.3M +$206K +10,753 +0.7%
Jacobs Levy Equity Management
12
Jacobs Levy Equity Management
New Jersey
$28.2M -$3.63M -189,444 -11%
FAM
13
Fred Alger Management
New York
$27.9M -$9.37M -489,117 -25%
Fidelity Investments
14
Fidelity Investments
Massachusetts
$27.5M +$6.71M +350,234 +32%
CIP
15
Champlain Investment Partners
Vermont
$26.2M -$210K -10,975 -0.8%
PWAM
16
Park West Asset Management
California
$21.5M -$9.14M -476,948 -30%
Morgan Stanley
17
Morgan Stanley
New York
$17.8M +$1.61M +83,860 +10%
Brown Advisory
18
Brown Advisory
Maryland
$17.7M +$234K +12,223 +1%
UBS Group
19
UBS Group
Switzerland
$16M +$4.01M +209,342 +33%
Balyasny Asset Management
20
Balyasny Asset Management
Illinois
$14.7M +$14.7M +769,743 New
Capital World Investors
21
Capital World Investors
California
$14.7M – – –
Baillie Gifford & Co
22
Baillie Gifford & Co
United Kingdom
$14M -$259K -13,535 -2%
Goldman Sachs
23
Goldman Sachs
New York
$13.7M +$653K +34,069 +5%
Northern Trust
24
Northern Trust
Illinois
$13.2M -$152K -7,922 -1%
Two Sigma Advisers
25
Two Sigma Advisers
New York
$13M -$3.87M -202,200 -23%
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