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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
Focus Partners Wealth
151
Focus Partners Wealth
Massachusetts
$337K +$174K +7,988 +84%
Allianz Asset Management
152
Allianz Asset Management
Germany
$324K +$367K +16,900 New
VIA
153
Vanguard Investments Australia
Australia
$324K +$367K +16,889 New
TRSOTSOK
154
Teachers Retirement System of the State of Kentucky
Kentucky
$323K – – –
COPPSERS
155
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$321K -$413 -19 -0.1%
CB
156
Commerce Bank
Missouri
$313K -$6.3K -290 -2%
Neuberger Berman Group
157
Neuberger Berman Group
New York
$308K +$1.98K +91 +0.6%
1WA
158
180 Wealth Advisors
Washington
$302K +$50.4K +2,320 +17%
OPERF
159
Oregon Public Employees Retirement Fund
Oregon
$297K – – –
CAPTRUST Financial Advisors
160
CAPTRUST Financial Advisors
North Carolina
$288K +$41.9K +1,930 +15%
State of Tennessee, Department of Treasury
161
State of Tennessee, Department of Treasury
Tennessee
$281K -$149K -6,867 -32%
KK
162
KLP Kapitalforvaltning
Norway
$278K – – –
CIAM
163
Caitong International Asset Management
Hong Kong
$273K +$300K +13,814 +3,205%
GCA
164
Greenwood Capital Associates
South Carolina
$267K -$30.6K -1,409 -9%
BS
165
Banco Santander
Spain
$263K +$298K +13,700 New
ECM
166
Evergreen Capital Management
Washington
$249K +$282K +12,992 New
CMF
167
Counterpoint Mutual Funds
California
$243K -$221K -10,179 -45%
CAM
168
Cresset Asset Management
Illinois
$242K +$274K +12,618 New
Amundi
169
Amundi
France
$242K -$366K -16,830 -57%
DS
170
DRW Securities
Illinois
$238K +$270K +12,419 New
GC
171
Guggenheim Capital
Illinois
$237K +$26.8K +1,235 +11%
EWA
172
EP Wealth Advisors
California
$228K +$41.5K +1,909 +19%
SC
173
Syon Capital
California
$219K +$249K +11,437 New
Victory Capital Management
174
Victory Capital Management
Texas
$209K +$24.2K +1,112 +11%
Pictet Asset Management
175
Pictet Asset Management
Switzerland
$206K +$234K +10,764 New
5 6
7
8 9

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.