Kurt A. Gustafson - 18 Feb 2026 Form 4 Insider Report for OmniAb, Inc. (OABI)

Reporting relationship: Executive VP, Finance and CFO
Issuer ticker: OABI
Reported as of: 18 Feb 2026
Net transaction value: -$15,905
SEC form: 4
Accepted by SEC: 18 Feb 2026, 18:35:30 UTC
Prior SEC filing: 17 Feb 2026
Next SEC filing: 07 Apr 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Charles S. Berkman, Attorney-in-Fact For: Kurt A. Gustafson

Key filing fact

Kurt A. Gustafson filed Form 4 for OmniAb, Inc. (OABI) on 18 Feb 2026.

Key facts

This page summarizes Kurt A. Gustafson's Form 4 filing for OmniAb, Inc. (OABI).
5 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 18 Feb 2026, 18:35.

Change

Previous filing in this sequence was filed on 17 Feb 2026.
Current net transaction value: -$15,905.

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 0001462354 Primary reporting owner

GUSTAFSON KURT A

Relationship: Executive VP, Finance and CFO
Address: 5980 HORTON STREET, STE 600, EMERYVILLE
Signature: By: /s/ Charles S. Berkman, Attorney-in-Fact For: Kurt A. Gustafson
Signature date: 18 Feb 2026

Reported non-derivative transactions

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

OABI transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +18,750
Change %: +7.2%
Price: $0.000000
Shares after: 278,152
Date: 18 Feb 2026
Ownership: Direct
Footnotes: F1, F2

OABI transaction

Common Stock

Sale

Transaction value: $15,905
Shares: -9,301
Change %: -3.3%
Price: $1.71
Shares after: 268,851
Date: 18 Feb 2026
Ownership: Direct
Footnotes: F3, F4

Reported derivative securities

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

OABI transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -18,750
Change %: -22%
Price: $0.000000
Shares after: 64,584
Date: 18 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 18,750
Exercise price: $0.000000
Footnotes: F1, F2

OABI transaction Derivative

Restricted Stock Units

Award

Transaction value: $0
Shares: +60,000
Change %: +93%
Price: $0.000000
Shares after: 124,584
Date: 18 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 60,000
Exercise price: $0.000000
Footnotes: F2, F5

OABI transaction Derivative

Stock Option

Award

Transaction value: $0
Shares: +600,000
Change %
Price: $0.000000
Shares after: 600,000
Date: 18 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 600,000
Exercise price: $1.71
Footnotes: F6

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

Represents the vesting of an RSU grant which occurs in three substantially equal annual installments beginning on February 18, 2026

Footnote F2

Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.

Footnote F3

Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. These sales are mandated by the Issuer's election under its equity incentive plans to require the satisfaction of a tax withholding obligation to be funded by a "sell-to-cover" transaction and do not represent discretionary trades by the reporting person.

Footnote F4

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.68 to $1.73. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Footnote F5

The RSU grant vests in three substantially equal annual installments beginning on February 18, 2027.

Footnote F6

The Stock Option grant vests and is exercisable as to 12.5% of the underlying shares 6 months after the grant date, and in 42 substantially equal monthly installments thereafter.