Form 4 for TNDM TANDEM DIABETES CARE INC
Accepted 2026-05-19 16:03:50 ET · period of report 2026-05-15 · accession 0001438133-26-000056 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2026-05-19 16:03 | 2026-05-15 | TNDM | Vosseller Leigh | EVP, CFO | M - OptEx | $0.00 | +13.5K | 51.8K | +35% | $0 |
| DM | 2026-05-19 16:03 | 2026-05-15 | TNDM | Vosseller Leigh | EVP, CFO | F - Tax | $12.82 | -4,843 | 48.1K | -9% | -$62.1K |
| D | 2026-05-19 16:03 | 2026-05-15 | TNDM | Vosseller Leigh | EVP, CFO | A - Grant | $10.90 | +1,336 | 49.4K | +3% | +$14.6K |
| DM | 2026-05-19 16:03 | 2026-05-15 | TNDM | Vosseller Leigh | EVP, CFO | M - OptEx | $0.00 | -13.5K | 21.0K | -39% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-05-15 | M | A | 1,503 | $0.00 | 40,914 | D | — | — | |
| 2 | Common | Common Stock | 2026-05-15 | F | D | 540 | $12.82 | 40,374 | D | — | — | (F1) Shares withheld by Tandem Diabetes Care Inc. (the Company) to satisfy tax withholding requirements on vesting of restricted stock units (RSU). No shares were sold. |
| 3 | Common | Common Stock | 2026-05-15 | M | A | 1,496 | $0.00 | 41,870 | D | — | — | |
| 4 | Common | Common Stock | 2026-05-15 | F | D | 537 | $12.82 | 41,333 | D | — | — | (F1) Shares withheld by Tandem Diabetes Care Inc. (the Company) to satisfy tax withholding requirements on vesting of restricted stock units (RSU). No shares were sold. |
| 5 | Common | Common Stock | 2026-05-15 | M | A | 10,496 | $0.00 | 51,829 | D | — | — | |
| 6 | Common | Common Stock | 2026-05-15 | F | D | 3,766 | $12.82 | 48,063 | D | — | — | (F1) Shares withheld by Tandem Diabetes Care Inc. (the Company) to satisfy tax withholding requirements on vesting of restricted stock units (RSU). No shares were sold. |
| 7 | Common | Common Stock | 2026-05-15 | A | A | 1,336 | $10.90 | 49,399 | D | — | — | (F2) The reporting person is voluntarily reporting the acquisition of shares of common stock pursuant to the Tandem Diabetes Care, Inc. Amended and Restated 2013 Employee Stock Purchase Plan (ESPP), for the ESPP purchase period of November 18, 2025, through May 15, 2026. This transaction is also exempt under Rule 16b-3(c). |
| 8 | Derivative | Restricted Stock Unit | 2026-05-15 | M | D | 1,503 | $0.00 | 0 | D | — · — to — | 1,503 Common Stock | (F4) Awarded on May 25, 2023 pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan). (F5) Each RSU represents a contingent right to receive either one share of common stock of the Issuer or cash in lieu thereof, at the Issuer's discretion, in accordance with the terms of the 2023 Plan. (F6) RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2024, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. (F6) RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2024, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. |
| 9 | Derivative | Restricted Stock Unit | 2026-05-15 | M | D | 1,496 | $0.00 | 5,982 | D | — · — to — | 1,496 Common Stock | (F7) Awarded on May 23, 2024 pursuant to the 2023 Plan. (F5) Each RSU represents a contingent right to receive either one share of common stock of the Issuer or cash in lieu thereof, at the Issuer's discretion, in accordance with the terms of the 2023 Plan. (F8) RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2025, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. (F8) RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2025, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. |
| 10 | Derivative | Restricted Stock Unit | 2026-05-15 | M | D | 10,496 | $0.00 | 20,992 | D | — · — to — | 10,496 Common Stock | (F9) Awarded on May 30, 2025 pursuant to the 2023 Plan. (F5) Each RSU represents a contingent right to receive either one share of common stock of the Issuer or cash in lieu thereof, at the Issuer's discretion, in accordance with the terms of the 2023 Plan. (F10) RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2026, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. (F10) RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2026, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. |