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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
EDRH
51
Edmond de Rothschild Holding
Switzerland
$4.95M – – –
BC
52
Beaconlight Capital
New York
$4.87M +$5.52M +253,877 New
TI
53
Trexquant Investment
Connecticut
$4.78M +$3.18M +146,579 +143%
Envestnet Asset Management
54
Envestnet Asset Management
Illinois
$4.66M +$469K +21,594 +10%
Public Sector Pension Investment Board (PSP Investments)
55
Public Sector Pension Investment Board (PSP Investments)
Quebec, Canada
$4.65M +$172K +7,923 +3%
BNP Paribas Financial Markets
56
BNP Paribas Financial Markets
France
$4M -$22.6M -1,039,768 -83%
SPS
57
Susquehanna Portfolio Strategies
Pennsylvania
$3.95M +$3.04M +139,741 +210%
Royal Bank of Canada
58
Royal Bank of Canada
Ontario, Canada
$3.95M -$54.2K -2,495 -1%
Arrowstreet Capital
59
Arrowstreet Capital
Massachusetts
$3.71M +$1.26M +57,803 +43%
RhumbLine Advisers
60
RhumbLine Advisers
Massachusetts
$3.57M +$45.6K +2,097 +1%
Assenagon Asset Management
61
Assenagon Asset Management
Luxembourg
$3.42M -$22.8M -1,049,216 -85%
UBS AM
62
UBS AM
Illinois
$3.23M +$78K +3,591 +2%
LCG
63
Lisanti Capital Growth
New York
$3.17M -$2.12M -97,560 -37%
PAM
64
Panagora Asset Management
Massachusetts
$3.14M +$379K +17,461 +12%
MMA
65
Mizuho Markets Americas
New York
$3.02M +$277K +12,745 +9%
Legal & General Group
66
Legal & General Group
United Kingdom
$2.98M -$360K -16,573 -10%
Toronto Dominion Bank
67
Toronto Dominion Bank
Ontario, Canada
$2.88M +$3.26M +150,078 New
Russell Investments Group
68
Russell Investments Group
United Kingdom
$2.56M +$107K +4,936 +4%
Swiss National Bank
69
Swiss National Bank
Switzerland
$2.56M – – –
Raymond James Financial
70
Raymond James Financial
Florida
$2.4M +$112K +5,176 +4%
BPC
71
Banque Pictet & Cie
Switzerland
$2.38M +$581K +26,748 +28%
Federated Hermes
72
Federated Hermes
Pennsylvania
$2.37M +$2.69M +123,794 +495,176%
Ameriprise
73
Ameriprise
Minnesota
$2.32M -$164K -7,570 -6%
Canada Pension Plan Investment Board
74
Canada Pension Plan Investment Board
Ontario, Canada
$2.27M -$1.29M -59,161 -33%
AG
75
Algert Global
California
$2.26M +$193K +8,860 +8%
1 2
3
4 5

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.