Vosseller Leigh 4

What Happened
Leigh Vosseller, Chief Financial Officer of Tandem Diabetes Care (TNDM), exercised/conversioned a total of 13,495 derivative shares on 2026-05-15 (three conversion events) and received 1,336 shares from an RSU award. To satisfy tax withholding on the RSU vesting, the company withheld 4,843 shares (three withholding events) generating approximately $62,087 in tax withholding proceeds. The RSU grant value reported for the 1,336 shares is $14,562 (at $10.90 per share).

Key Details

• Transaction date: 2026-05-15 (reported on Form 4 filed 2026-05-19). Filing appears within required business-day window.
• Derivative exercises/conversions (code M): 1,503 + 1,496 + 10,496 = 13,495 shares at $0.00 exercise price (acquired via conversion).
• Tax withholding (code F): 540, 537 and 3,766 shares withheld at $12.82 each, totaling $6,923; $6,884; and $48,280 (total ≈ $62,087). No open-market sale occurred—shares were withheld by the company to cover taxes (footnote F1).
• Grant/award (code A): 1,336 shares reported as acquired at $10.90 each (value $14,562). Footnotes indicate these are RSUs subject to the company's 2023 Long-Term Incentive Plan and that RSUs vest 33% on 5/15/2026 with the remainder vesting in equal quarterly installments thereafter (see F10, F4, F5).
• Shares owned after the transaction: not stated in this filing (not reported).
• Transaction codes: M = exercise/conversion of derivative, F = tax withholding, A = grant/award.

Context
This filing shows a typical combination of option/derivative conversion and RSU vesting with net settlement for tax withholding. The withheld shares satisfy tax obligations (not an open‑market sale), which is a routine administrative step and not necessarily a market sentiment signal. For retail investors, purchases or grants (like the RSU award) are generally more informative than routine tax-withholding disposals.