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, Q1 2024
Institutional positions in Tandem Diabetes Care Inc as of Mar 31, 2024. 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
- 291
- +25 vs. Q4 2023
- Shares held
- 74.1M
- +3.31M (+4.7%) vs. Q4 2023
- Total value
- $2.63B
- +$531.0M (+25.3%) vs. Q4 2023
- New holders
- 54
- 123 more added
- Sold out
- 29
- 78 more reduced
2 institutions that held it in Q4 2023 haven't filed for Q1 2024 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2023: 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, Q1 2024
Shares, value and share of portfolio for each institution holding Tandem Diabetes Care Inc; share changes are against Q4 2023.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Capital International Inc | 0 | $0 | 0.00% | −29,213−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −21,232−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −19,801−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −17,584−100.0% | Sold out |
| B. Riley Asset Management, LLC | 0 | $0 | 0.00% | −21,395−100.0% | Sold out |
| Campbell & CO Investment Adviser LLC | 0 | $0 | 0.00% | −12,254−100.0% | Sold out |
| Capital Group Investment Management Pte. Ltd. | 0 | $0 | 0.00% | −11,300−100.0% | Sold out |
| CenterBook Partners LP | 0 | $0 | 0.00% | −6,929−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −3,759−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −3,631−100.0% | Sold out |
| Loomis Sayles & Co L P | 0 | $0 | 0.00% | −400−100.0% | Sold out |
| Lee Financial Co | 0 | $0 | 0.00% | −385−100.0% | Sold out |
| Beacon Capital Management, LLC | 0 | $0 | 0.00% | −202−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −67−100.0% | Sold out |
| Focused Wealth Management, Inc | 0 | $0 | 0.00% | −40−100.0% | Sold out |
| AlphaMark Advisors, LLC | 0 | $0 | 0.00% | −30−100.0% | Sold out |
| Able Wealth Management LLC | 0 | $0 | 0.00% | −31−100.0% | Sold out |
| Security National Bank | 0 | $0 | 0.00% | −26−100.0% | Sold out |
| Crewe Advisors LLC | 0 | $0 | 0.00% | −6−100.0% | Sold out |
| National Bank of Canada | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Spouting Rock Asset Management, LLC | – | – | – | – | Not filed |
| NinePointTwo Capital | – | – | – | – | Not filed |