Key facts
- This page summarizes James B. Tananbaum's Form 4 filing for Latigo Biotherapeutics, Inc. (LTGO).
- 15 reported transactions and 7 derivative rows are listed below.
- Accepted by SEC: 10 Aug 2026, 20:00.
James B. Tananbaum - 10 Aug 2026 Form 4 Insider Report for Latigo Biotherapeutics, Inc. (LTGO)
- Reporting relationship
- Director, 10%+ Owner
- Issuer ticker
- LTGO
- Reported as of
- 10 Aug 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 10 Aug 2026, 20:00:09 UTC
- Prior SEC filing
- 06 Aug 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Sabrina Nieder, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
James B. Tananbaum filed Form 4 for Latigo Biotherapeutics, Inc. (LTGO) on 10 Aug 2026.
Change
- Previous filing in this sequence was filed on 06 Aug 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001581754
Primary reporting owner
Tananbaum James B.
- Relationship
- Director, 10%+ Owner
- Address
- C/O LATIGO BIOTHERAPEUTICS, INC., 1300 RANCHO CONEJO BLVD., SUITE 305, THOUSAND OAKS
- Signature
- /s/ Sabrina Nieder, Attorney-in-Fact
- Signature date
- 10 Aug 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +3,117,664
- Change %
- Price
- Shares after
- 3,117,664
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +445,320
- Change %
- +14%
- Price
- Shares after
- 3,562,984
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F1, F2
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +1,125,823
- Change %
- Price
- Shares after
- 1,125,823
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F1, F3
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +742,201
- Change %
- +66%
- Price
- Shares after
- 1,868,024
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F1, F3
LTGO
transaction
Common Stock
Purchase
- Transaction value
- Shares
- +140,000
- Change %
- +7.5%
- Price
- $18.00*
- Shares after
- 2,008,024
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F3
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +195,776
- Change %
- +9.7%
- Price
- Shares after
- 2,203,800
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F3, F4
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +3,117,664
- Change %
- Price
- Shares after
- 3,117,664
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F1, F5
LTGO
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +296,880
- Change %
- +9.5%
- Price
- Shares after
- 3,414,544
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Footnotes
- F1, F5
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
LTGO
transaction
Derivative
Series A-2 Convertible Stock
Conversion of derivative security
- Transaction value
- Shares
- -3,117,664
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 3,117,664
- Exercise price
- Footnotes
- F1, F2
LTGO
transaction
Derivative
Series B Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -445,320
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 445,320
- Exercise price
- Footnotes
- F1, F2
LTGO
transaction
Derivative
Series A-2 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -1,125,823
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 1,125,823
- Exercise price
- Footnotes
- F1, F3
LTGO
transaction
Derivative
Series B Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -742,201
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 742,201
- Exercise price
- Footnotes
- F1, F3
LTGO
transaction
Derivative
Series A-2 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -3,117,664
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 3,117,664
- Exercise price
- Footnotes
- F1, F5
LTGO
transaction
Derivative
Series B Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -296,880
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 296,880
- Exercise price
- Footnotes
- F1, F5
LTGO
transaction
Derivative
Convertible Promissory Note
Conversion of derivative security
- Transaction value
- Shares
- -195,776
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 10 Aug 2026
- Ownership
- See footnote
- Underlying class
- Common Stock
- Underlying amount
- 195,776
- Exercise price
- Footnotes
- F3, F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 5 footnotes
Footnote F1
Each 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.
Footnote F2
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. 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.
Footnote F3
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. 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.
Footnote F4
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.
Footnote F5
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. 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.