Filing Flows › Tandem Diabetes Care (TNDM) › Who owns the stock
Who owns Tandem Diabetes Care (TNDM) stock
258 funds reported Tandem Diabetes Care (TNDM) shares in their latest 13F filings, worth $1.3B in all. The largest holder is BlackRock ($175M). Last quarter 132 funds added to their stakes and 126 cut them. Members of Congress and other officials disclosed 2 trades (2 buys, 0 sales).
Largest holders (13F)
| Fund | Shares | Value | Change | Quarter |
|---|---|---|---|---|
| BlackRock | 11,583,125 | $175M | increase | 2026-06-30 |
| Vanguard Group | 7,341,356 | $161M | increase | 2025-12-31 |
| Sessa Capital IM, L.P. | 5,100,000 | $77.0M | increase | 2026-06-30 |
| Vanguard Portfolio Management LLC | 4,299,667 | $64.9M | increase | 2026-06-30 |
| First Light Asset Management, LLC | 3,383,553 | $51.1M | increase | 2026-06-30 |
| Vanguard Capital Management LLC | 3,096,536 | $46.7M | increase | 2026-06-30 |
| State Street | 2,851,646 | $43.0M | increase | 2026-06-30 |
| Jennison Associates LLC | 2,331,429 | $35.2M | increase | 2026-06-30 |
| Paradice Investment Management LLC | 2,007,415 | $32.7M | decrease | 2026-09-30 |
| Jacobs Levy Equity Management | 2,006,429 | $30.3M | increase | 2026-06-30 |
| Freestone Grove Partners LP | 1,866,134 | $28.2M | increase | 2026-06-30 |
| Geode Capital Management, LLC | 1,800,797 | $27.2M | increase | 2026-06-30 |
| Driehaus Capital Management LLC | 1,786,996 | $27.0M | decrease | 2026-06-30 |
| Citadel Advisors LLC | 1,735,879 | $26.2M | decrease | 2026-06-30 |
| Millennium Management LLC | 1,311,739 | $19.8M | increase | 2026-06-30 |
Trades by Congress and other officials
| Date | Who | Trade | Amount |
|---|---|---|---|
| 2026-09-29 | Gilbert Cisneros | purchase | $1K–$15K |
| 2026-03-03 | Gilbert Cisneros | purchase | $1K–$15K |
Tandem Diabetes Care's latest quarter
Tandem Diabetes Care, Q3 2026: revenue $284M (+14% year over year), operating margin -0.8%, net loss $7.1M, operating cash flow −$819K. The chart follows the revenue to costs, profit and cash.
Questions
Who owns the most TNDM stock?
By the latest 13F filings: BlackRock ($175M); Vanguard Group ($161M); Sessa Capital IM, L.P. ($77.0M); Vanguard Portfolio Management LLC ($64.9M); First Light Asset Management, LLC ($51.1M).
Has Congress traded TNDM stock?
Officials disclosed 2 trades on file: 2 buys and 0 sales. The latest: Gilbert Cisneros, purchase on 2026-09-29.
What is the short interest in TNDM?
15,086,560 shares were sold short at the 2026-10-15 settlement, 12.85% of the float.
Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.