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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
PAS
176
Park Avenue Securities
New York
$204K +$27K +1,244 +13%
ProShare Advisors
177
ProShare Advisors
Maryland
$202K -$57.2K -2,631 -20%
AWM
178
Apollon Wealth Management
South Carolina
$202K -$9.21K -424 -4%
PF
179
Prosperitas Financial
California
$192K – – –
LSA
180
Leonteq Securities AG
Switzerland
$182K +$36.8K +1,695 +22%
TRCT
181
Tower Research Capital (TRC)
New York
$175K -$85K -3,911 -30%
ASN
182
Advisory Services Network
Georgia
$159K +$180K +8,274 New
Public Employees Retirement Association of Colorado
183
Public Employees Retirement Association of Colorado
Colorado
$147K – – –
BC
184
Bayforest Capital
United Kingdom
$139K -$438K -20,144 -73%
AIP
185
Ameritas Investment Partners
Nebraska
$107K – – –
N
186
Natixis
France
$105K +$120K +5,500 New
Ensign Peak Advisors
187
Ensign Peak Advisors
Utah
$96.5K – – –
CUAMC
188
China Universal Asset Management Company
China
$95.8K -$65.2K -3,000 -38%
VEA
189
Virtus ETF Advisers
New York
$84.3K +$95.6K +4,400 New
GI
190
GAMMA Investing
California
$67.1K -$22.6K -1,040 -23%
CFD
191
Creative Financial Designs
Indiana
$65.8K – – –
VCM
192
Versant Capital Management
Arizona
$63.9K +$64.3K +2,958 +785%
PWPS
193
Pinnacle Wealth Planning Services
Ohio
$58.9K +$1.43K +66 +2%
FFA
194
Farther Finance Advisors
California
$58.7K -$10.4K -479 -13%
VanEck Associates
195
VanEck Associates
New York
$56K -$11.1K -512 -15%
Simplex Trading
196
Simplex Trading
Illinois
$55.6K +$63.1K +2,903 New
EP
197
Essential Partners
California
$55.4K +$22 +1 +0%
Nisa Investment Advisors
198
Nisa Investment Advisors
Missouri
$53.3K +$31.4K +1,447 +108%
Osaic Holdings
199
Osaic Holdings
Arizona
$49.6K -$608 -28 -1%
SFFS
200
Stonehage Fleming Financial Services
Jersey
$48.9K – – –
6 7
8
9 10

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.