Tandem Diabetes Care, Inc. (TNDM) ownership: Top institutional holder: BlackRock, Inc. ($204.94M). Insider activity: Net Seller (0 buys, 20 sells). 6 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 10690844.00 | $204.94M | 2026-03-31 |
| VANGUARD GROUP INC | 7341356.00 | $161.36M | 2025-12-31 |
| UBS Group AG | 5178570.00 | $99.27M | 2026-03-31 |
| Sessa Capital IM, L.P. | 4730757.00 | $90.69M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3993333.00 | $76.55M | 2026-03-31 |
| ArrowMark Colorado Holdings LLC | 3103609.00 | $59.50M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3038919.00 | $58.26M | 2026-03-31 |
| GW&K Investment Management, LLC | 2689106.00 | $51.55M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 | |
| Sell | null | 2026-08-15 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.