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 2025
Institutional positions in Tandem Diabetes Care Inc as of Jun 30, 2025. 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
- 271
- −2 vs. Q1 2025
- Shares held
- 81.0M
- +7.96M (+10.9%) vs. Q1 2025
- Total value
- $1.51B
- +$107.8M (+7.7%) vs. Q1 2025
- New holders
- 40
- 117 more added
- Sold out
- 42
- 71 more reduced
2 institutions that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2025: 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 2025
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −9,078−100.0% | Sold out |
| Coldstream Capital Management Inc | 0 | $0 | 0.00% | −6,651−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −5,800−100.0% | Sold out |
| NBC Securities, Inc. | 0 | $0 | 0.00% | −1,945−100.0% | Sold out |
| Mather Group, LLC. | 0 | $0 | 0.00% | −345−100.0% | Sold out |
| Sierra Ocean, LLC | 0 | $0 | 0.00% | −155−100.0% | Sold out |
| Continuum Advisory, LLC | 0 | $0 | 0.00% | −100−100.0% | Sold out |
| CarsonAllaria Wealth Management, Ltd. | 0 | $0 | 0.00% | −75−100.0% | Sold out |
| Bartlett & Co. Wealth Management LLC | 0 | $0 | 0.00% | −62−100.0% | Sold out |
| Quent Capital, LLC | 0 | $0 | 0.00% | −60−100.0% | Sold out |
| Aventura Private Wealth, LLC | 0 | $0 | 0.00% | −30−100.0% | Sold out |
| 1620 Investment Advisors, Inc. | 0 | $0 | 0.00% | −25−100.0% | Sold out |
| Stephens Consulting, LLC | 0 | $0 | 0.00% | −20−100.0% | Sold out |
| Orion Portfolio Solutions, LLC | – | – | – | – | Not filed |
| Lindbrook Capital, LLC | – | – | – | – | Not filed |