Tandem Diabetes Care, Inc.
TNDM institutional ownership changes in Q2 2026: 76 institutions opened or added positions, 72 trimmed or exited. TNDM (Tandem Diabetes Care, Inc.) is held by 139 institutional investors as of Q2 2026. Top institutional shareholders: BlackRock, Inc. ($174.8M), Vanguard Portfolio Management LLC ($64.9M), Vanguard Capital Management LLC ($46.7M). Institutions were buying, on balance.
Who's Trading
Latest move
Source dates: Price Nov 6, 2026 · Insiders Oct 19, 2026 · Activists Aug 6, 2026 · Congress none
Top Holders
| Action | ||||||
|---|---|---|---|---|---|---|
Increased | 11.6M(+8.3%) | $174.8M | 0.0% | -54.54% | 33 | |
Increased | 4.3M(+7.7%) | $64.9M | 0.0% | -10.43% | 32 | |
Increased | 3.1M(+1.9%) | $46.7M | 0.0% | -11.44% | 30 | |
Increased | 2.9M(+7.1%) | $43M | 0.0% | -72.79% | 31 | |
Increased | 2.3M(+40.6%) | $35.2M | 0.0% | -26.25% | 38 | |
Increased | 2M(+31.7%) | $30.3M | 0.1% | -39.70% | 44 | |
Increased | 1.9M(+40.2%) | $28.2M | 0.2% | +30.21% | 46 | |
Increased | 1.8M(+7.2%) | $27.2M | 0.0% | -65.80% | 31 | |
Decreased | 1.8M(-22.4%) | $27M | 0.2% | -19.99% | 0 | |
Decreased | 1.7M(-20.8%) | $26.2M | 0.0% | -22.78% | 0 | |
Increased | 1.3M(+72.2%) | $19.8M | 0.0% | -8.28% | 42 | |
New | 1.3M | $19.7M | 0.1% | +12.06% | 39 | |
Decreased | 1.1M(-44.0%) | $17.3M | 0.0% | -17.95% | 0 | |
Increased | 976,432(+36.8%) | $14.7M | 0.0% | -34.31% | 37 | |
Increased | 900,590(+29.3%) | $13.6M | 0.1% | +15.02% | 42 | |
Decreased | 871,811(-16.4%) | $13.2M | 0.0% | -12.99% | 0 | |
Decreased | 862,301(-61.1%) | $13M | 0.0% | -30.60% | 0 | |
Increased | 753,690(+6.7%) | $11.4M | 0.0% | -68.83% | 30 | |
Increased | 700,000(+553.5%) | $10.6M | 0.1% | +7.66% | 45 | |
Increased | 691,789(+9.3%) | $10.4M | 0.1% | -10.16% | 30 |
Showing 1-20 of 156
| Insider | Trade | Traded |
|---|---|---|
| Kyrillos Jean-Claude | Exercise 4K sh | |
| Kyrillos Jean-Claude | Tax 2K sh | |
| Morrison Susan | Tax 495 sh | |
| Morrison Susan | Exercise 2K sh | |
| Vosseller Leigh | Exercise 3K sh | |
| Sheridan John F | Exercise 10K sh | |
| Vosseller Leigh | Tax 942 sh | |
| Sheridan John F | Tax 3K sh | |
| Sheridan John F | Tax 5K sh | |
| Sheridan John F | Exercise 6K sh |
| Filer | Stake | Filed |
|---|---|---|
| Voya Financial, Inc. | 0.2% | |
| Voya Financial, Inc. | 6.3% | |
| Vanguard Capital Management | 5.2% | |
| Vanguard Portfolio Management | 5.9% | |
| The Vanguard Group | 0.0% | |
| ArrowMark Colorado Holdings, LLC | 4.3% | |
| Sessa Capital (Master), L.P. | 6.7% | |
| BlackRock, Inc. | 15.2% |
TNDMTandem Diabetes Care, Inc.Continue exploring
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ABTAbbott LaboratoriesQuestions investors ask about TNDM
Who owns TNDM?
139 institutional investors held TNDM on June 30, 2026, led by BlackRock, Inc. ($174.8M), Vanguard Portfolio Management LLC ($64.9M) and Vanguard Capital Management LLC ($46.7M).
How many hedge funds hold TNDM?
139 institutional investors reported TNDM in their 13F filings for the quarter ended June 30, 2026, $894M in all. 6 of them are rated Elite.
Are institutions buying or selling TNDM?
Buying, on balance. In Q2 2026, 76 institutions opened or added to positions in TNDM and 72 institutions trimmed or exited.
Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer