Kurt A. Gustafson - 07 Apr 2026 Form 4 Insider Report for OmniAb, Inc. (OABI)

Reporting relationship: Executive VP, Finance and CFO
Issuer ticker: OABI
Reported as of: 07 Apr 2026
Net transaction value: -$10,300
SEC form: 4
Accepted by SEC: 07 Apr 2026, 20:25:02 UTC
Prior SEC filing: 18 Feb 2026
Next SEC filing: 17 Jun 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 07 Apr 2026.

Key facts

This page summarizes Kurt A. Gustafson's Form 4 filing for OmniAb, Inc. (OABI).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 07 Apr 2026, 20:25.

Change

Previous filing in this sequence was filed on 18 Feb 2026.
Current net transaction value: -$10,300.

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: 07 Apr 2026

Reported non-derivative transactions

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

OABI transaction

Common Stock

Options Exercise

Transaction value
Shares: +13,542
Change %: +5.3%
Price: $0.000000^*
Shares after: 268,396
Date: 07 Apr 2026
Ownership: Direct
Footnotes: F1, F2, F3

OABI transaction

Common Stock

Sale

Transaction value: $10,300
Shares: -6,913
Change %: -2.6%
Price: $1.49
Shares after: 261,483
Date: 07 Apr 2026
Ownership: Direct
Footnotes: F4, F5

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
Shares: -13,542
Change %: -11%
Price: $0.000000^*
Shares after: 111,042
Date: 07 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 13,542
Exercise price: $0.000000
Footnotes: F1, F2

^* 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

Represents the vesting of an RSU grant which occurs in three substantially equal annual installments beginning on April 7, 2024.

Footnote F2

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

Footnote F3

The total includes the transfer of 13,997 OABI common stock shares on March 11, 2026 to the reporting person's ex-spouse per a domestic relations order.

Footnote F4

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 F5

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.46 to $1.53. 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.