Tandem Diabetes Care Inc
TNDM- Exchange
- Nasdaq
- Industry
- Surgical & Medical Instruments & Apparatus
- SEC CIK
- 0001438133
No open-market purchases or sales by Tandem Diabetes Care Inc insiders were filed in the last 90 days; 274 institutions reported holding it in 13F filings for Q2 2026, worth $1.19B in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Tandem Diabetes Care Inc as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 274
- +3 vs. Q1 2026
- Shares held
- 78.7M
- +94.9K (+0.1%) vs. Q1 2026
- Total value
- $1.19B
- −$319.1M (−21.2%) vs. Q1 2026
- New holders
- 48
- 95 more added
- Sold out
- 45
- 91 more reduced
3 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting TNDM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 274 | $1.19B |
| Q1 2026 | 274 | $1.51B |
| Q4 2025 | 269 | $1.65B |
| Q3 2025 | 255 | $911.3M |
| Q2 2025 | 271 | $1.51B |
| Q1 2025 | 275 | $1.40B |
| Q4 2024 | 316 | $2.60B |
| Q3 2024 | 332 | $3.10B |
| Q2 2024 | 317 | $2.96B |
| Q1 2024 | 291 | $2.63B |
| Q4 2023 | 268 | $2.10B |
| Q3 2023 | 226 | $1.45B |
| Q2 2023 | 247 | $1.65B |
| Q1 2023 | 274 | $2.77B |
| Q4 2022 | 295 | $2.89B |
| Q3 2022 | 299 | $3.00B |
| Q2 2022 | 331 | $3.64B |
| Q1 2022 | 379 | $6.92B |
| Q4 2021 | 388 | $9.09B |
| Q3 2021 | 338 | $7.32B |
| Q2 2021 | 303 | $5.75B |
| Q1 2021 | 290 | $5.08B |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −8,274−100.0% | Sold out |
| Natixis | 0 | $0 | 0.00% | −5,500−100.0% | Sold out |
| Van Eck Associates Corp | 0 | $0 | 0.00% | −2,918−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −2,903−100.0% | Sold out |
| OP Asset Management Ltd | 0 | $0 | 0.00% | −1,835−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −1,815−100.0% | Sold out |
| Ancora Advisors, LLC | 0 | $0 | 0.00% | −1,230−100.0% | Sold out |
| Kemnay Advisory Services Inc. | 0 | $0 | 0.00% | −538−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −480−100.0% | Sold out |
| Beacon Investment Advisory Services, Inc. | 0 | $0 | 0.00% | −240−100.0% | Sold out |
| GWM Advisors LLC | 0 | $0 | 0.00% | −227−100.0% | Sold out |
| Twin Peaks Wealth Advisors, LLC | 0 | $0 | 0.00% | −142−100.0% | Sold out |
| Newbridge Financial Services Group, Inc. | 0 | $0 | 0.00% | −120−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −113−100.0% | Sold out |
| JPL Wealth Management, LLC | 0 | $0 | 0.00% | −61−100.0% | Sold out |
| Golden State Equity Partners | 0 | $0 | 0.00% | −40−100.0% | Sold out |
| Bell Investment Advisors, Inc | 0 | $0 | 0.00% | −36−100.0% | Sold out |
| Root Financial Partners, LLC | 0 | $0 | 0.00% | −14−100.0% | Sold out |
| Abound Wealth Management | 0 | $0 | 0.00% | −5−100.0% | Sold out |
| Janus Henderson Group PLC | – | – | – | – | Not filed |
| CWM, LLC | – | – | – | – | Not filed |
| McIlrath & Eck, LLC | – | – | – | – | Not filed |