R. Jacob Vogelstein - 16 Oct 2026 Form 4 Insider Report for Iambic Therapeutics, Inc. (IAM)

Reporting relationship: Director
Issuer ticker: IAM
Reported as of: 16 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 Oct 2026, 19:53:17 UTC
Prior SEC filing: 14 Oct 2026
Source filing: View source filing
Reporting owner signature: /s/ Sunny Chang, by power of attorney

Filing notes and source

Key filing fact

R. Jacob Vogelstein filed Form 4 for Iambic Therapeutics, Inc. (IAM) on 19 Oct 2026.

Key facts

This page summarizes R. Jacob Vogelstein's Form 4 filing for Iambic Therapeutics, Inc. (IAM).
8 reported transactions and 5 derivative rows are listed below.
Accepted by SEC: 19 Oct 2026, 19:53.

Change

Previous filing in this sequence was filed on 14 Oct 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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002154030 Primary reporting owner

Vogelstein R Jacob

Relationship: Director
Address: C/O IAMBIC THERAPEUTICS, INC., 5627 OBERLIN DRIVE, SUITE 120, SAN DIEGO
Signature: /s/ Sunny Chang, by power of attorney
Signature date: 19 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

IAM transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +1,995,749
Change %
Price
Shares after: 1,995,749
Date: 16 Oct 2026
Ownership: See footnote
Footnotes: F1, F2, F3, F4

IAM transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +1,458,290
Change %
Price
Shares after: 1,458,290
Date: 16 Oct 2026
Ownership: See footnote
Footnotes: F5, F6

IAM transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +742,546
Change %
Price
Shares after: 742,546
Date: 16 Oct 2026
Ownership: See footnote
Footnotes: F7, F8

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

IAM transaction Derivative

Series A Convertible Preferred Stock

Conversion of derivative security

Transaction value
Shares: -1,141,878
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 16 Oct 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 1,141,878
Exercise price
Footnotes: F1, F4

IAM transaction Derivative

Series B Convertible Preferred Stock

Conversion of derivative security

Transaction value
Shares: -731,187
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 16 Oct 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 731,187
Exercise price
Footnotes: F2, F4

IAM transaction Derivative

Series B-3 Convertible Preferred Stock

Conversion of derivative security

Transaction value
Shares: -122,684
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 16 Oct 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 122,684
Exercise price
Footnotes: F3, F4

IAM transaction Derivative

Series B-4 Convertible Preferred Stock

Conversion of derivative security

Transaction value
Shares: -1,458,290
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 16 Oct 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 1,458,290
Exercise price
Footnotes: F5, F6

IAM transaction Derivative

Convertible Promissory Notes

Conversion of derivative security

Transaction value
Shares: -742,546
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 16 Oct 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 742,546
Exercise price
Footnotes: F7, F8

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 8 footnotes

Footnote F1

Each share of Series A Convertible Preferred Stock automatically converted into Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.

Footnote F2

Each share of Series B Convertible Preferred Stock automatically converted into Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.

Footnote F3

Each share of Series B-3 Convertible Preferred Stock automatically converted into Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.

Footnote F4

The shares are held of record by Catalio Nexus Fund III, LP, or Catalio Nexus. Catalio Capital Management, LP, or Catalio Capital Mgmt, a registered investment advisor, is the investment manager for Catalio Nexus. As a managing partner of Catalio Capital Mgmt, the reporting person shares voting and dispositive power with respect to the shares held by Catalio Nexus. The reporting person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any.

Footnote F5

Each share of Series B-4 Convertible Preferred Stock automatically converted into Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date.

Footnote F6

The shares are held of record by Catalio Access Fund VIII, LLC, or Catalio Access. Catalio Capital Mgmt provides investment management services for Catalio Access. As a managing partner of Catalio Capital Mgmt, the reporting person shares voting and dispositive power with respect to the shares held by Catalio Access.The reporting person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any.

Footnote F7

The conversion price was equal to 85% of the Issuer's initial public offering price of $16.00 per share (reflecting a 15% discount).

Footnote F8

The shares are held of record by Catalio BH SPV, LLC, or Catalio SPV. Catalio Capital Mgmt is the investment manager for Catalio SPV. As a managing partner of Catalio Capital Mgmt, the reporting person shares voting and dispositive power with respect to the shares held by Catalio SPV. The reporting person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any.

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