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Tandem Diabetes Care
TNDM

272 hedge funds and large institutions have $1.51B invested in Tandem Diabetes Care in 2026 Q1 according to their latest regulatory filings, with 45 funds opening new positions, 94 increasing their positions, 93 reducing their positions, and 35 closing their positions.

New
Increased
Maintained
Reduced
Closed

1,139% more call options, than puts

Call options by funds: $108M | Put options by funds: $8.7M

29% more first-time investments, than exits

New positions opened: 45 | Existing positions closed: 35

4.68% more ownership

Funds ownership: 110.44% → 115.12% (+4.7%)

1% more funds holding

Funds holding: 268 → 272 (+4)

1% more repeat investments, than reductions

Existing positions increased: 94 | Existing positions reduced: 93

8% less capital invested

Capital invested by funds: $1.65B → $1.51B (-$138M)

67% less funds holding in top 10

Funds holding in top 10: 3 → 1 (-2)

Holders
272
Holders Change
+4
Holders Change %
+1.49%
% of All Funds
3.35%
Holding in Top 10
1
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-66.67%
% of All Funds
0.01%
New
45
Increased
94
Reduced
93
Closed
35
Calls
$108M
Puts
$8.7M
Net Calls
+$99.1M
Net Calls Change
+$41.9M

Top Buyers

1
UBS Group
UBS Group
Switzerland
+$35.4M
2
Wellington Management Group
Wellington Management Group
Massachusetts
+$20.5M
3
SCM
Soleus Capital Management
Connecticut
+$17M
4
DCM
Defilade Capital Management
California
+$16.6M
5
DCM
Driehaus Capital Management
Illinois
+$15.1M

Top Sellers

1
Assenagon Asset Management
Assenagon Asset Management
Luxembourg
-$22.8M
2
BNP Paribas Financial Markets
BNP Paribas Financial Markets
France
-$22.6M
3
Morgan Stanley
Morgan Stanley
New York
-$15.7M
4
Barclays
Barclays
United Kingdom
-$10.8M
5
BlackRock
BlackRock
New York
-$9.96M
Name Holding Trade Value Shares
Change 		Change in
Stake
Renaissance Technologies
101
Renaissance Technologies
New York
$1.12M +$1.27M +58,227 New
JFG
102
Jefferies Financial Group
New York
$1.09M +$1.23M +56,722 New
Mirae Asset Global ETFs Holdings
103
Mirae Asset Global ETFs Holdings
Hong Kong
$1.06M -$136K -6,256 -10%
Canada Life
104
Canada Life
Manitoba, Canada
$1.02M -$66.2K -3,046 -5%
Qube Research & Technologies (QRT)
105
Qube Research & Technologies (QRT)
United Kingdom
$996K +$1.13M +51,961 New
TC
106
TwinBeech Capital
New York
$985K +$1.12M +51,366 New
LCM
107
Legato Capital Management
California
$960K -$489K -22,495 -31%
Thrivent Financial for Lutherans
108
Thrivent Financial for Lutherans
Minnesota
$868K -$29K -1,333 -3%
State of Wisconsin Investment Board
109
State of Wisconsin Investment Board
Wisconsin
$816K -$11.1K -512 -1%
BCI
110
Brinker Capital Investments
Pennsylvania
$803K +$28.1K +1,291 +3%
OAM
111
Oppenheimer Asset Management
New York
$782K +$61.9K +2,851 +8%
IC
112
IEQ Capital
California
$748K +$257K +11,829 +44%
MIM
113
MetLife Investment Management
New Jersey
$744K -$6.15K -283 -0.7%
BHCM
114
Brevan Howard Capital Management
Jersey
$735K +$92.2K +4,245 +12%
STA
115
Summit Trail Advisors
New York
$724K +$69.8K +3,214 +9%
SOADOR
116
State of Alaska Department of Revenue
Alaska
$719K -$24.1K -1,107 -3%
Bank of Montreal
117
Bank of Montreal
Ontario, Canada
$718K +$411K +18,913 +102%
HWM
118
HighMark Wealth Management
Minnesota
$654K -$21.7K -1,000 -3%
American Century Companies
119
American Century Companies
Missouri
$642K +$15.4K +710 +2%
Corient Private Wealth
120
Corient Private Wealth
Florida
$637K -$33.5K -1,542 -4%
SG Americas Securities
121
SG Americas Securities
New York
$633K -$629K -28,936 -47%
Mariner
122
Mariner
Kansas
$633K -$54.8K -2,521 -7%
Wells Fargo
123
Wells Fargo
California
$604K -$1.15M -52,881 -63%
Truist Financial
124
Truist Financial
North Carolina
$587K +$53.2K +2,448 +9%
LSERS
125
Louisiana State Employees Retirement System
Louisiana
$577K -$21.7K -1,000 -3%
3 4
5
6 7

TNDM Hedge Fund Activity: Q1 2026 in Review

272 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in Tandem Diabetes Care (TNDM) for Q1 2026, worth a combined $1.51B — down 8.4% from $1.65B a quarter earlier.

Buyers outnumbered sellers: 45 funds opened new TNDM positions and 35 closed out — a net gain of 10 holders — while 94 added to existing stakes and 93 trimmed.

The largest buyer was UBS Group, adding an estimated $35.4M. The largest seller was Assenagon Asset Management, cutting an estimated $22.8M.

  • 272 institutional investors held Tandem Diabetes Care (TNDM) as of Q1 2026, up from 268 in Q4 2025.
  • Funds reported $1.51B of Tandem Diabetes Care stock for Q1 2026, down 8.4% quarter-over-quarter.
  • 45 funds opened new Tandem Diabetes Care positions in Q1 2026 and 35 closed out, a net change of +10 holders.
  • The largest Tandem Diabetes Care buyer in Q1 2026 was UBS Group, an estimated $35.4M added.
  • The largest Tandem Diabetes Care seller in Q1 2026 was Assenagon Asset Management, an estimated $22.8M sold.

Based on aggregated 13F filings for Q1 2026.