STOCK TITAN

Foresite funds receive millions of Latigo (LTGO) shares in IPO-linked moves

(Very High)
(Positive)
Form Type
4

Rhea-AI Filing Summary

Latigo Biotherapeutics, Inc. (LTGO) received a Form 4 from several affiliated Foresite Capital funds, all reporting as ten percent owners. On August 10, 2026, they reported the conversion of 9,041,328 derivative securities (preferred stock and a convertible note) into an equal number of common shares, largely in connection with Latigo’s initial public offering as described in the footnotes. The same day, an affiliated fund also purchased 140,000 shares of common stock at $18.00 per share, all held indirectly through the funds, with each reporting person disclaiming beneficial ownership beyond its pecuniary interest.

Positive

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Negative

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Insider Foresite Capital Management V, LLC, Foresite Capital Fund V, L.P., Foresite Capital Opportunity Management V, LLC, Foresite Capital Opportunity Fund V, L.P., Foresite Capital Management VI LLC, Foresite Capital Fund VI LP
Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner
Bought 140,000 shs ($2.52M)
Type Security Shares Price Value
Conversion Series A-2 Convertible Preferred Stock F1, F2 3,117,664 $0.00 $0.00
Conversion Series B Convertible Preferred Stock F1, F2 445,320 $0.00 $0.00
Conversion Series A-2 Convertible Preferred Stock F1, F3 1,125,823 $0.00 $0.00
Conversion Series B Convertible Preferred Stock F1, F3 742,201 $0.00 $0.00
Conversion Series A-2 Convertible Preferred Stock F1, F4 3,117,664 $0.00 $0.00
Conversion Series B Convertible Preferred Stock F1, F4 296,880 $0.00 $0.00
Conversion Convertible Promissory Note F5, F3 195,776 -- --
Conversion Common Stock F1, F2 3,117,664 $0.00 $0.00
Conversion Common Stock F1, F2 445,320 $0.00 $0.00
Conversion Common Stock F1, F3 1,125,823 $0.00 $0.00
Conversion Common Stock F1, F3 742,201 $0.00 $0.00
Purchase Common Stock F3 140,000 $18.00 $2.52M
Conversion Common Stock F1, F5, F3 195,776 -- --
Conversion Common Stock F1, F4 3,117,664 $0.00 $0.00
Conversion Common Stock F1, F4 296,880 $0.00 $0.00
Holdings After Transaction: Series A-2 Convertible Preferred Stock — 0 shares (Indirect, See Footnote); Series B Convertible Preferred Stock — 0 shares (Indirect, See Footnote); Convertible Promissory Note — 0 shares (Indirect, See Footnote); Common Stock — 3,414,544 shares (Indirect, See Footnote)
Footnotes (5)
  1. F1. 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.
  2. 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. 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.
  3. 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. 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.
  4. F4. 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.
  5. F5. 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.
Derivative securities converted 9,041,328 shares Total derivative exercises (Series A-2, Series B preferred and note) on August 10, 2026
Common stock purchased 140,000 shares Indirect purchase of LTGO common stock on August 10, 2026
Purchase price $18.00 per share Price paid for 140,000 LTGO common shares
Convertible note conversion shares 195,776 shares Common stock received upon conversion of the convertible promissory note
Convertible note maturity date June 17, 2027 Stated maturity date of the convertible promissory note that converted into common stock
Exercise transactions 7 derivative exercises Number of derivative conversion transactions reported
Series A-2 Convertible Preferred Stock financial
"security_title: "Series A-2 Convertible Preferred Stock""
Series B Convertible Preferred Stock financial
"security_title: "Series B Convertible Preferred Stock""
Series B convertible preferred stock is a class of shares sold during a later-stage private financing that combines features of a loan and common stock: it usually pays priority dividends or has a priority claim if the company is sold, and it can be converted into common shares under predefined rules. Investors care because these shares affect ownership stakes and payout order—like having a reserved place in line and a ticket that can turn into regular ownership—so they influence potential returns and dilution for other shareholders.
convertible promissory note financial
"Reflects a convertible note that is convertible into shares of Common Stock"
A convertible promissory note is a loan a company takes now that can later be turned into shares instead of being repaid in cash. Think of it as lending money with the option to accept ownership in the business down the road; that matters to investors because it affects who gets paid first, how much ownership existing shareholders keep, and the company’s future valuation and cash needs. Terms such as conversion price, interest and maturity determine the financial impact.
initial public offering financial
"converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering"
An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.
maturity date financial
"The convertible note has a maturity date of June 17, 2027."
The maturity date is the specific day when a loan, bond, or investment reaches its full term and the borrower must repay the borrowed amount in full. It is important for investors because it indicates when they will receive their initial money back and can plan their future financial steps accordingly. Think of it as the due date for a loan or the day a gift card or coupon expires.

FAQ

What insider transactions did Foresite Capital report for LTGO on August 10, 2026?

Affiliated Foresite Capital funds reported converting 9,041,328 derivative securities into common stock and separately purchasing 140,000 LTGO common shares at $18.00 per share, all held indirectly by the funds with beneficial ownership disclaimed beyond pecuniary interests.

How many Latigo Biotherapeutics (LTGO) shares did Foresite Capital acquire by purchase?

Foresite Capital, through an affiliated fund, reported purchasing 140,000 shares of LTGO common stock on August 10, 2026 at a price of $18.00 per share, in addition to shares received from conversions of preferred stock and a convertible note.

What preferred stock did Foresite convert into LTGO common shares?

Affiliated Foresite entities reported converting Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock into LTGO common stock. Footnotes state each preferred share automatically converted 1:1 into common stock upon the closing of Latigo’s initial public offering.

What are the details of the LTGO convertible promissory note held by Foresite?

An affiliated Foresite entity held a convertible promissory note that converted into 195,776 LTGO common shares. The footnote states the note has a maturity date of June 17, 2027 and that principal plus accrued interest automatically converted at the IPO price upon the IPO closing.

Are the LTGO shares held directly by Foresite Capital or by funds?

The LTGO securities are held of record by Foresite Capital funds (Fund V, Fund VI, and Opportunity Fund V). Their respective general partners may be deemed to have voting and dispositive power, and all reporting persons disclaim beneficial ownership beyond their pecuniary interests.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Foresite Capital Management V, LLC

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Latigo Biotherapeutics, Inc. [ LTGO ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock08/10/2026C(1)3,117,664A$0.003,117,664ISee Footnote(2)
Common Stock08/10/2026C(1)445,320A$0.003,562,984ISee Footnote(2)
Common Stock08/10/2026C(1)1,125,823A$0.001,125,823ISee Footnote(3)
Common Stock08/10/2026C(1)742,201A$0.001,868,024ISee Footnote(3)
Common Stock08/10/2026P140,000A$182,008,024ISee Footnote(3)
Common Stock08/10/2026C(1)195,776A(5)2,203,800ISee Footnote(3)
Common Stock08/10/2026C(1)3,117,664A$0.003,117,664ISee Footnote(4)
Common Stock08/10/2026C(1)296,880A$0.003,414,544ISee Footnote(4)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Series A-2 Convertible Preferred Stock(1)08/10/2026C(1)3,117,664 (1) (1)Common Stock3,117,664$0.000ISee Footnote(2)
Series B Convertible Preferred Stock(1)08/10/2026C(1)445,320 (1) (1)Common Stock445,320$0.000ISee Footnote(2)
Series A-2 Convertible Preferred Stock(1)08/10/2026C(1)1,125,823 (1) (1)Common Stock1,125,823$0.000ISee Footnote(3)
Series B Convertible Preferred Stock(1)08/10/2026C(1)742,201 (1) (1)Common Stock742,201$0.000ISee Footnote(3)
Series A-2 Convertible Preferred Stock(1)08/10/2026C(1)3,117,664 (1) (1)Common Stock3,117,664$0.000ISee Footnote(4)
Series B Convertible Preferred Stock(1)08/10/2026C(1)296,880 (1) (1)Common Stock296,880$0.000ISee Footnote(4)
Convertible Promissory Note(5)08/10/2026C(5)195,776 (5) (5)Common Stock195,776(5)0ISee Footnote(3)
1. Name and Address of Reporting Person*
Foresite Capital Management V, LLC

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Foresite Capital Fund V, L.P.

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Foresite Capital Opportunity Management V, LLC

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Foresite Capital Opportunity Fund V, L.P.

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Foresite Capital Management VI LLC

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Foresite Capital Fund VI LP

(Last)(First)(Middle)
C/O FORESITE CAPITAL MANAGEMENT
9200 SUNSET BOULEVARD, SUITE PH1

(Street)
WEST HOLLYWOOD CALIFORNIA 90069

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. 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.
2. 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.
3. 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.
4. 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.
5. 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 Member08/10/2026
FORESITE CAPITAL FUND V, L.P., By: Foresite Capital Management V, LLC, Its: General Partner, By: /s/ James B. Tananbaum, Managing Member08/10/2026
FORESITE CAPITAL OPPORTUNITY MANAGEMENT V, LLC, By: /s/ James B. Tananbaum, Managing Member08/10/2026
FORESITE CAPITAL OPPORTUNITY FUND V, L.P., By: Foresite Capital Opportunity Management V, LLC, Its: General Partner, By: /s/ James B. Tananbaum, Managing Member08/10/2026
FORESITE CAPITAL MANAGEMENT VI, LLC, By: /s/ James B. Tananbaum, Managing Member08/10/2026
FORESITE CAPITAL FUND VI LP, By: Foresite Capital Management VI, LLC, Its: General Partner, By: /s/ James B. Tananbaum, Managing Member08/10/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)