SEC Form 4 · accession 0001581754-26-000006

Latigo Biotherapeutics, Inc. · LTGO

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

James B. Tananbaum

Director · 10% Owner

Period of report

Aug 10, 2026

Accepted (ET)

Aug 10, 2026 · 8:00 pm EDT

Rule 10b5-1 plan

box not checked

Issuer CIK

0002056611

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1,F2	Aug 10, 2026	C	3,117,664	—	A	3,117,664	I	See footnote
Common Stock^F1,F2	Aug 10, 2026	C	445,320	—	A	3,562,984	I	See footnote
Common Stock^F1,F3	Aug 10, 2026	C	1,125,823	—	A	1,125,823	I	See footnote
Common Stock^F1,F3	Aug 10, 2026	C	742,201	—	A	1,868,024	I	See footnote
Common Stock^F3	Aug 10, 2026	P	140,000	$18.00	A	2,008,024	I	See footnote
Common Stock^F4,F3	Aug 10, 2026	C	195,776	—	A	2,203,800	I	See footnote
Common Stock^F1,F5	Aug 10, 2026	C	3,117,664	—	A	3,117,664	I	See footnote
Common Stock^F1,F5	Aug 10, 2026	C	296,880	—	A	3,414,544	I	See footnote

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	D/I
Series A-2 Convertible Stock^F1,F2	—	Aug 10, 2026	C	3,117,664	D	—	—	Common Stock	3,117,664	I
Series B Convertible Preferred Stock^F1,F2	—	Aug 10, 2026	C	445,320	D	—	—	Common Stock	445,320	I
Series A-2 Convertible Preferred Stock^F1,F3	—	Aug 10, 2026	C	1,125,823	D	—	—	Common Stock	1,125,823	I
Series B Convertible Preferred Stock^F1,F3	—	Aug 10, 2026	C	742,201	D	—	—	Common Stock	742,201	I
Series A-2 Convertible Preferred Stock^F1,F5	—	Aug 10, 2026	C	3,117,664	D	—	—	Common Stock	3,117,664	I
Series B Convertible Preferred Stock^F1,F5	—	Aug 10, 2026	C	296,880	D	—	—	Common Stock	296,880	I
Convertible Promissory Note^F4,F3	—	Aug 10, 2026	C	195,776	D	—	—	Common Stock	195,776	I

Explanation of responses

F1Each share of 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.
F2The 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. The Reporting Person 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 Fund V, FCM V and the Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.
F3The 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. The Reporting Person 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 Fund VI, FCM VI and the Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.
F4Reflects 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.
F5The 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. The Reporting Person 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 Opportunity Fund V, FCOM V and the Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.