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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
UB
226
UMB Bank
Missouri
$8.51K +$1.46K +67 +18%
SCM
227
Sterling Capital Management
North Carolina
$8.42K -$109 -5 -1%
Rockefeller Capital Management
228
Rockefeller Capital Management
New York
$8.3K -$4.21K -194 -31%
TFA
229
Transamerica Financial Advisors
Florida
$7.46K – – –
C
230
Covestor
United Kingdom
$7K -$6.76K -311 -45%
Los Angeles Capital Management
231
Los Angeles Capital Management
California
$6.67K – – –
SIC
232
SJS Investment Consulting
Ohio
$6.15K +$6.74K +310 +2,818%
QC
233
Quent Capital
New York
$5.92K -$3.22K -148 -32%
PA
234
Parallel Advisors
California
$5.08K +$4.35K +200 +308%
BIAS
235
Beacon Investment Advisory Services
New Jersey
$4.6K +$5.21K +240 New
NA
236
NewEdge Advisors
Louisiana
$4.35K +$2.76K +127 +127%
TWD
237
True Wealth Design
Ohio
$3.97K +$3.04K +140 +209%
HI
238
Harbour Investments
Wisconsin
$3.91K – – –
TPWA
239
Twin Peaks Wealth Advisors
California
$2.72K +$3.08K +142 New
RIL
240
Rothschild Investment LLC
Illinois
$2.55K +$217 +10 +8%
CT
241
Colonial Trust
South Carolina
$2.39K -$130 -6 -5%
NFSG
242
Newbridge Financial Services Group
Florida
$2.3K – – –
MCM
243
MAI Capital Management
Ohio
$2.17K -$608 -28 -20%
Bessemer Group
244
Bessemer Group
New Jersey
$2K – – –
FRA
245
Front Row Advisors
California
$1.92K – – –
TFA
246
Toth Financial Advisory
Virginia
$1.92K – – –
FFO
247
Fortitude Family Office
Arizona
$1.86K – – –
KFAS
248
Keating Financial Advisory Services
Kansas
$1.48K +$1.67K +77 New
IA
249
IFP Advisors
Florida
$1.32K – – –
JWM
250
JPL Wealth Management
Colorado
$1.17K +$1.32K +61 New
8 9
10
11 12

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.