X0609 4 2026-07-24 0001464521 Heartflow, Inc. HTFL 0001519465 Lightcap Jeffrey C false C/O HEARTFLOW, INC. 135 MAIN STREET, SUITE 1000 SAN FRANCISCO CA 94105 1 0 Common Stock 2026-07-24 4 M 0 47420 19.00 A 293681 D Common Stock 4615542 I By HCPCIV 1, LLC Common Stock 833075 I By HealthCor Partners Fund II, L.P. Common Stock 1248939 I By HealthCor Partners Fund, L.P. Stock Option 19.00 2026-07-24 4 M 0 47420 0 D 2035-08-07 Common Stock 47420 0 D Mr. Lightcap is a controlling member of each of HealthCor Partners Fund II, L.P. and HealthCor Partners Fund, L.P. and may be deemed to have voting and dispositive power with respect to the shares. Mr. Lightcap disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. These stock options are fully exercisable. /s/ Nga Van by power of attorney 2026-07-28