Tandem Diabetes Care (TNDM)
Builds software-updatable insulin pumps, cartridges, and infusion sets for diabetes care.
$17.50
After hours0.00 (0.00%)
At close$17.50(−0.68%)
Something off on this page? Send us feedback.
13F · 13D/G · Form 4
| Institutions | 114.11% | 79.40M shares | |
|---|---|---|---|
| 290 holders · as of Jun 30, 2026 | |||
| Insiders | 1.19% | 825.5K shares | |
| 17 holders · as of Aug 18, 2026 | |||
| Strategic holders | 6.24% | 4.34M shares | |
| 1 holder · as of May 5, 2026 | |||
| Adds to | 121.54% | ||
69.58M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
These groups come from separate filings that can overlap, so they add to 121.54%; nothing is left for Other.
13F, as of Jun 30, 2026
290 holders · 79.40M shares · 49 new positions · 145 increased · 91 reduced · 48 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 11.58M | 16.65% | +892.3K | Aug 7, 2026 |
| Sessa Capital Im, L.P. | 5.10M | 7.33% | +369.2K | Aug 14, 2026 |
| Vanguard Portfolio Management LLC | 4.30M | 6.18% | +306.3K | Aug 13, 2026 |
| First Light Asset Management, LLC | 3.38M | 4.86% | +2.07M | Aug 14, 2026 |
| Vanguard Capital Management LLC | 3.10M | 4.45% | +57.6K | Aug 13, 2026 |
| State Street Corp | 2.85M | 4.10% | +189.4K | Aug 7, 2026 |
| GW&K Investment Management, LLC | 2.57M | 3.69% | −120.1K | Aug 12, 2026 |
| Jennison Associates LLC | 2.33M | 3.35% | +673.0K | Aug 3, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 15.20% | 10.11M | 13G | Apr 29, 2025 |
| Sessa Capital (Master), L.P. | 6.71% | 4.47M | 13G | May 15, 2025 |
| Voya Financial, Inc. | 6.30% | 4.34M | 13G | May 5, 2026 |
| Vanguard Portfolio Management | 5.91% | 4.05M | 13G | Apr 29, 2026 |
| Vanguard Capital Management | 5.18% | 3.55M | 13G | Apr 30, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Mar 17, 2026 | Mark David Novaraofficer: EVP & CHIEF COMMERCIAL OFFICER | Sale | 187 | $23.05 | 37,656 |
| Mar 5, 2026 | Mark David Novaraofficer: EVP & CHIEF COMMERCIAL OFFICER | Sale | 2 | $22.81 | 35,969 |
House and Senate disclosures
Not reported.