X0609 4 2026-08-10 0 0002056611 Latigo Biotherapeutics, Inc. LTGO 0001792206 Foresite Capital Management V, LLC false C/O FORESITE CAPITAL MANAGEMENT 9200 SUNSET BOULEVARD, SUITE PH1 WEST HOLLYWOOD CA 90069 0 0 1 0 0001792204 Foresite Capital Fund V, L.P. false C/O FORESITE CAPITAL MANAGEMENT 9200 SUNSET BOULEVARD, SUITE PH1 WEST HOLLYWOOD CA 90069 0 0 1 0 0001792207 Foresite Capital Opportunity Management V, LLC false C/O FORESITE CAPITAL MANAGEMENT 9200 SUNSET BOULEVARD, SUITE PH1 WEST HOLLYWOOD CA 90069 0 0 1 0 0001792205 Foresite Capital Opportunity Fund V, L.P. false C/O FORESITE CAPITAL MANAGEMENT 9200 SUNSET BOULEVARD, SUITE PH1 WEST HOLLYWOOD CA 90069 0 0 1 0 0002013341 Foresite Capital Management VI LLC false C/O FORESITE CAPITAL MANAGEMENT 9200 SUNSET BOULEVARD, SUITE PH1 WEST HOLLYWOOD CA 90069 0 0 1 0 0001932516 Foresite Capital Fund VI LP false C/O FORESITE CAPITAL MANAGEMENT 9200 SUNSET BOULEVARD, SUITE PH1 WEST HOLLYWOOD CA 90069 0 0 1 0 0 Common Stock 2026-08-10 4 C 0 3117664 0.00 A 3117664 I See Footnote Common Stock 2026-08-10 4 C 0 445320 0.00 A 3562984 I See Footnote Common Stock 2026-08-10 4 C 0 1125823 0.00 A 1125823 I See Footnote Common Stock 2026-08-10 4 C 0 742201 0.00 A 1868024 I See Footnote Common Stock 2026-08-10 4 P 0 140000 18.00 A 2008024 I See Footnote Common Stock 2026-08-10 4 C 0 195776 A 2203800 I See Footnote Common Stock 2026-08-10 4 C 0 3117664 0.00 A 3117664 I See Footnote Common Stock 2026-08-10 4 C 0 296880 0.00 A 3414544 I See Footnote Series A-2 Convertible Preferred Stock 2026-08-10 4 C 0 3117664 0.00 D Common Stock 3117664 0 I See Footnote Series B Convertible Preferred Stock 2026-08-10 4 C 0 445320 0.00 D Common Stock 445320 0 I See Footnote Series A-2 Convertible Preferred Stock 2026-08-10 4 C 0 1125823 0.00 D Common Stock 1125823 0 I See Footnote Series B Convertible Preferred Stock 2026-08-10 4 C 0 742201 0.00 D Common Stock 742201 0 I See Footnote Series A-2 Convertible Preferred Stock 2026-08-10 4 C 0 3117664 0.00 D Common Stock 3117664 0 I See Footnote Series B Convertible Preferred Stock 2026-08-10 4 C 0 296880 0.00 D Common Stock 296880 0 I See Footnote Convertible Promissory Note 2026-08-10 4 C 0 195776 D Common Stock 195776 0 I See Footnote Each share of the Issuer's preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date. The securities are held of record by Foresite Capital Fund V, L.P. ("Fund V"). Foresite Capital Management V, LLC ("FCM V") is the general partner of Fund V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. James B. Tananbaum (Tananbaum) is the sole managing member of FCM V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. Each of the Reporting Persons disclaims the existence of a "group" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. The securities are held of record by Foresite Capital Fund VI LP ("Fund VI"). Foresite Capital Management VI, LLC ("FCM VI") is the general partner of Fund VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Tananbaum is the sole managing member of FCM VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Each of the Reporting Persons disclaims the existence of a "group" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. The securities are held of record by Foresite Capital Opportunity Fund V, L.P. ("Opportunity Fund V"). Foresite Capital Opportunity Management V, LLC ("FCOM V") is the general partner of Opportunity Fund V and may be deemed to have sole voting and dispositive power over the shares held by Opportunity Fund V. Tananbaum is the sole managing member of FCOM V and may be deemed to have sole voting and dispositive power over the securities held by Opportunity Fund V. Each of the Reporting Persons disclaims the existence of a "group" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock. FORESITE CAPITAL MANAGEMENT V, LLC, By: /s/ James B. Tananbaum, Managing Member 2026-08-10 FORESITE CAPITAL FUND V, L.P., By: Foresite Capital Management V, LLC, Its: General Partner, By: /s/ James B. Tananbaum, Managing Member 2026-08-10 FORESITE CAPITAL OPPORTUNITY MANAGEMENT V, LLC, By: /s/ James B. Tananbaum, Managing Member 2026-08-10 FORESITE CAPITAL OPPORTUNITY FUND V, L.P., By: Foresite Capital Opportunity Management V, LLC, Its: General Partner, By: /s/ James B. Tananbaum, Managing Member 2026-08-10 FORESITE CAPITAL MANAGEMENT VI, LLC, By: /s/ James B. Tananbaum, Managing Member 2026-08-10 FORESITE CAPITAL FUND VI LP, By: Foresite Capital Management VI, LLC, Its: General Partner, By: /s/ James B. Tananbaum, Managing Member 2026-08-10