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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
IIM
76
INTECH Investment Management
Florida
$2.14M +$1.83M +84,050 +307%
Verition Fund Management
77
Verition Fund Management
Connecticut
$2.05M +$2.1M +96,532 +912%
SEI Investments
78
SEI Investments
Pennsylvania
$1.83M -$245K -11,292 -11%
Zurich Cantonal Bank
79
Zurich Cantonal Bank
Switzerland
$1.81M +$442K +20,325 +27%
PP
80
PDT Partners
New York
$1.8M -$360K -16,580 -15%
Universal-Beteiligungs- und Servicegesellschaft
81
Universal-Beteiligungs- und Servicegesellschaft
Germany
$1.67M -$37.7K -1,737 -2%
California State Teachers Retirement System (CalSTRS)
82
California State Teachers Retirement System (CalSTRS)
California
$1.62M +$431K +19,844 +31%
AllianceBernstein
83
AllianceBernstein
Tennessee
$1.61M -$3.5M -161,144 -69%
Susquehanna International Group
84
Susquehanna International Group
Pennsylvania
$1.55M -$1.08M -49,572 -38%
NIMC
85
Nierenberg Investment Management Company
Washington
$1.52M +$760K +34,955 +78%
Tudor Investment Corp
86
Tudor Investment Corp
Connecticut
$1.51M -$632K -29,064 -27%
YIH
87
Y-Intercept (HK)
Hong Kong
$1.49M -$133K -6,107 -7%
Cerity Partners
88
Cerity Partners
New York
$1.46M -$11.8K -543 -0.7%
RHJA
89
Rice Hall James & Associates
California
$1.4M +$227K +10,463 +17%
FG
90
Formula Growth
Quebec, Canada
$1.36M -$1.98K -91 -0.1%
Prudential Financial
91
Prudential Financial
New Jersey
$1.33M +$95.4K +4,390 +7%
T. Rowe Price Associates
92
T. Rowe Price Associates
Maryland
$1.32M +$258K +11,852 +21%
Citigroup
93
Citigroup
New York
$1.31M +$1.09M +49,978 +272%
New York State Teachers Retirement System (NYSTRS)
94
New York State Teachers Retirement System (NYSTRS)
New York
$1.27M -$47.9K -2,204 -3%
Jones Financial Companies
95
Jones Financial Companies
Missouri
$1.23M +$1.23M +56,826 +3,638%
CCM
96
Cinctive Capital Management
New York
$1.22M +$1.39M +63,812 New
Natixis Advisors
97
Natixis Advisors
Massachusetts
$1.17M +$88.3K +4,063 +7%
XT
98
XTX Topco
Cayman Islands
$1.17M +$1.32M +60,821 New
Deutsche Bank
99
Deutsche Bank
Germany
$1.16M +$139K +6,399 +12%
VAM
100
Vanguard Asset Management
$1.12M +$1.27M +58,288 New
2 3
4
5 6

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.