TWOMEY CHRISTOPHER J 4

4 · TANDEM DIABETES CARE INC · Filed May 22, 2026

AI-generated summary of this filing

Updated May 23, 2026

Tandem Diabetes (TNDM) Director Christopher Twomey Receives RSU Award

What Happened

Christopher J. Twomey, a director of Tandem Diabetes Care, received a grant of 10,220 restricted stock units (RSUs) on May 20, 2026 (reported as an award, code A). Separately, 8,759 RSUs that were granted on May 21, 2025 vested on May 21, 2026, converted into common shares (reported as an exercise/conversion, code M), and those 8,759 shares were recorded as disposed the same day. All reported transactions show $0.00 per share (no cash purchase or sale value reported).

Key Details

Transaction dates and types:
- 2026-05-20: Grant/award of 10,220 RSUs (A) at $0.00.
- 2026-05-21: Conversion/exercise of 8,759 RSUs into shares (M) at $0.00 (acquired) and same-day disposition of 8,759 shares (M) at $0.00.
Price/Value: Reported price for all items = $0.00; no cash proceeds reported in the filing.
Shares owned after transaction: Not specified in the provided summary of the filing.
Footnotes of note:
- The 10,220 award is a derivative RSU grant under the 2023 Long-Term Incentive Plan (see footnotes F3–F4).
- The 8,759 RSUs were granted on May 21, 2025 and vested/converted on the one‑year anniversary (F5).
- Securities are held by the Chris J. Twomey and Rebecca J. Twomey Family Trust and by Twomey Family Investments, LLC; Mr. Twomey is co-manager and disclaims beneficial ownership except to his pecuniary interest (F1–F2).
Filing timeliness: Reported period of report is 2026-05-20 and the Form 4 was filed 2026-05-22 — appears timely.

Context

RSUs are awards that convert into shares (or cash in lieu) according to plan terms; the filing notes the RSUs vest on the one-year anniversary. Converting RSUs and an immediate disposition on the same day commonly reflects shares being surrendered or withheld to satisfy tax-withholding obligations, although the filing lists $0.00 and does not state the precise withholding mechanism.
This filing documents equity compensation vesting and a new RSU grant rather than an open-market buy or sale; such activity is typically routine for executive/director compensation.

Form 4

Period: 2026-05-20

Director

Transactions

Exercise/Conversion
Common Stock
2026-05-21+8,759→ 24,434 total
Award
Restricted Stock Unit
[F3][F4]
2026-05-20+10,220→ 10,220 total
→ Common Stock (10,220 underlying)
Exercise/Conversion
Restricted Stock Unit
[F3][F5]
2026-05-21−8,759→ 0 total
→ Common Stock (8,759 underlying)

Holdings

Footnotes (5)

[F1]The securities are held by the Chris J. Twomey and Rebecca J. Twomey Family Trust UTD September 20, 2002.
[F2]The securities are directly owned by Twomey Family Investments, LLC. The Reporting Person is co-manager of Twomey Family Investments, LLC and shares voting and investment power over these securities held by Twomey Family Investments, LLC and may be deemed to have indirect beneficial ownership of such shares. The Reporting Person disclaims beneficial ownership of such securities held by Twomey Family Investments, LLC, except to the extent of his proportionate pecuniary interest therein.
[F3]Each restricted stock units (RSU) represents a contingent right to receive either one share of the Issuers common stock or cash in lieu thereof, at the Issuers discretion, in accordance with the terms of the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan).
[F4]RSU will vest on the one-year anniversary of the grant date, subject to the terms of the 2023 Plan.
[F5]On May 21, 2025, the Reporting Person was granted 8,759 RSUs, all of which vested and converted into shares of the Issuers common stock on the one-year anniversary thereof in accordance with the 2023 Plan.

Signature

/s/ Jerilyn Laskie, Attorney-in-Fact for Christopher J. Twomey|2026-05-22

3 files