Tandem Diabetes Care
TNDM
273 hedge funds and large institutions have $1.19B invested in Tandem Diabetes Care in 2026 Q2 according to their latest regulatory filings, with 49 funds opening new positions, 95 increasing their positions, 91 reducing their positions, and 45 closing their positions.
893% more call options, than puts
Call options by funds: $90.4M | Put options by funds: $9.1M
9% more first-time investments, than exits
New positions opened: 49 | Existing positions closed: 45
4% more repeat investments, than reductions
Existing positions increased: 95 | Existing positions reduced: 91
0% more funds holding
Funds holding: 273 → 273 (0)
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
0.28% less ownership
Funds ownership: 115.15% → 114.87% (-0.28%)
21% less capital invested
Capital invested by funds: $1.51B → $1.19B (-$320M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
FLAM
First Light Asset Management
Edina,
Minnesota
|
+$36.1M |
| 2 |
WP
Woodline Partners
San Francisco,
California
|
+$22.8M |
| 3 |
BlackRock
New York
|
+$15.6M |
| 4 |
Jennison Associates
New York
|
+$11.8M |
| 5 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$11M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
ACH
ArrowMark Colorado Holdings
Denver,
Colorado
|
-$31.5M |
| 2 |
Marshall Wace
London,
United Kingdom
|
-$27.7M |
| 3 |
Goldman Sachs
New York
|
-$23.7M |
| 4 |
Two Sigma Investments
New York
|
-$22.8M |
| 5 |
Baillie Gifford & Co
Edinburgh,
United Kingdom
|
-$20.9M |
TNDM Hedge Fund Activity: Q2 2026 in Review
273 of the 8,316 institutional investors tracked by Wall St. Rank reported a position in Tandem Diabetes Care (TNDM) for Q2 2026, worth a combined $1.19B — down 21% from $1.51B a quarter earlier.
Buyers outnumbered sellers: 49 funds opened new TNDM positions and 45 closed out — a net gain of 4 holders — while 95 added to existing stakes and 91 trimmed.
The largest buyer was First Light Asset Management, adding an estimated $36.1M. The largest seller was ArrowMark Colorado Holdings, cutting an estimated $31.5M.
- 273 institutional investors held Tandem Diabetes Care (TNDM) as of Q2 2026, unchanged from Q1 2026.
- Funds reported $1.19B of Tandem Diabetes Care stock for Q2 2026, down 21% quarter-over-quarter.
- 49 funds opened new Tandem Diabetes Care positions in Q2 2026 and 45 closed out, a net change of +4 holders.
- The largest Tandem Diabetes Care buyer in Q2 2026 was First Light Asset Management, an estimated $36.1M added.
- The largest Tandem Diabetes Care seller in Q2 2026 was ArrowMark Colorado Holdings, an estimated $31.5M sold.
Based on aggregated 13F filings for Q2 2026.