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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
Adage Capital Partners
276
Adage Capital Partners
Massachusetts
– -$4.02M -182,995 Closed
HF
277
HRT Financial
New York
– -$3.7M -170,480 Closed
EGM
278
Engineers Gate Manager
New York
– -$1.95M -88,547 Closed
Norges Bank
279
Norges Bank
Norway
– -$1.19M -54,306 Closed
WG
280
Winton Group
United Kingdom
– -$972K -44,244 Closed
JF
281
Jump Financial
Illinois
– -$910K -41,416 Closed
Capital Fund Management (CFM)
282
Capital Fund Management (CFM)
France
– -$844K -38,400 Closed
HSBC Holdings
283
HSBC Holdings
United Kingdom
– -$810K -36,553 Closed
A
284
AlphaQuest
New York
– -$783K -35,634 Closed
DM
285
Deerfield Management
New York
– -$573K -26,090 Closed
PA
286
PharVision Advisers
Florida
– -$430K -19,554 Closed
CG
287
Caprock Group
Idaho
– -$326K -14,831 Closed
SSA
288
Schonfeld Strategic Advisors
New York
– -$321K -14,590 Closed
MWA
289
MN Wealth Advisors
Kansas
– -$303K -13,770 Closed
Man Group
290
Man Group
United Kingdom
– -$281K -12,782 Closed
FRM
291
Fox Run Management
Connecticut
– -$251K -11,398 Closed
LIP
292
Lighthouse Investment Partners
Florida
– -$242K -11,000 Closed
Cetera Investment Advisers
293
Cetera Investment Advisers
Illinois
– -$240K -10,937 Closed
MSRPS
294
Maryland State Retirement & Pension System
Maryland
– -$217K -9,855 Closed
Creative Planning
295
Creative Planning
Kansas
– -$208K -9,478 Closed
EC
296
EntryPoint Capital
New York
– -$208K -9,477 Closed
FT
297
Fiduciary Trust
Massachusetts
– -$208K -9,447 Closed
Walleye Trading
298
Walleye Trading
New York
– -$203K -9,358 Closed
QL
299
Quarry LP
New York
– -$31.6K -1,437 Closed
SSG
300
Summit Securities Group
New York
– -$9.49K -432 Closed
9 10 11
12
13

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.