144 0001236389 XXXXXXXX LIVE 0001093557 DEXCOM INC 000-51222 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 8582000200 FOLETTA MARK G Director Common UBS Financial Services, Inc.

11 Madison Ave 4th Floor New York NY 10010

2000 170640.00 377360765 08/03/2026 NASDAQ Common 05/31/2019 Vested RSUs Issuer N 2000 05/31/2019 N/A N The Foletta Family Trust dtd 1/30/2015

6340 SEQUENCE DRIVE SAN DIEGO CA 92121

Common 06/15/2026 4000 296539.60 The Foletta Family Trust dtd 1/30/2015

6340 SEQUENCE DRIVE SAN DIEGO CA 92121

Common 07/31/2026 2000 160000.00 The shares covered under this filing are being sold under the Foletta Family Trust dtd 1/30/2015. 08/03/2026 03/13/2026 /s/ UBS Financial Services Inc, as attorney-in-fact for Mark Foletta