X0609 4 2026-03-24 0001464521 Heartflow, Inc. HTFL 0001519465 Lightcap Jeffrey C false C/O HEARTFLOW, INC. 331 E. EVELYN AVENUE MOUNTAIN VIEW CA 94041 1 0 Common Stock 2026-03-24 4 J 0 206261 0 A 246261 D Common Stock 833075 I By HealthCor Partners Fund II, L.P. Common Stock 1248939 I By HealthCor Partners Fund, L.P. On March 24, 2026, HCPCIV 1, LLC ("HCPCIV") effected a pro rata in-kind distribution of Heartflow, Inc. common stock to its members in accordance with its operating agreement, including 206,261 shares allocable to Mr. Lightcap based on his indirect interest in HCPCIV immediately prior to the distribution. Following the distribution, HCPCIV is being dissolved. After giving effect to the distribution, Mr. Lightcap's beneficial ownership is held directly (and no longer indirectly through HCPCIV) to the extent of the shares received. 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. /s/ Nga Van by power of attorney 2026-03-26