<div id="readability-page-1"><div>Gustafson Kurt A Chief Financial Officer of OmniAb Inc [OABI] filed a Form 4 on December 9, 2025 with the Securities and Exchange Commission disclosing the following changes in ownership:<div><table><tbody><tr><th>Date</th><th>Transaction</th><th>Shares</th><th>Price</th><th>Value</th></tr><tr><td>12/7/25</td><td>Exercise</td><td>46,500</td><td>$0.00</td><td>N/A</td></tr><tr><td>12/8/25</td><td>Surrender(1)</td><td>23,922</td><td>$1.96</td><td>$46,887</td></tr></tbody></table></div>Ending Holdings: 252,688 - Direct<ul><li>(1)</li><li>Surrender of shares back to company to pay option exercise cost and/or resulting tax liability.</li></ul>For a free trial, or to learn more about our insider trading analysis and data services, please visit http://www.washingtonservice.com or contact us at (301) 913-5100 or send an email to info@washingtonservice.com.Founded in 1970, The Washington Service provides securities professionals with financial, economic and public policy research and data. </div></div>

OABI

OmniAb Inc's CFO, Gustafson Kurt A, filed a Form 4 with the SEC, revealing changes in ownership. On December 7, 2025, he exercised 46,500 shares, and on December 8, 2025, surrendered 23,922 shares at $1.96 each to cover option exercise costs and tax liabilities. His ending holdings are 252,688 shares directly. This event highlights insider trading activities within the company.

CFO Gustafson Acquires 22,578 Of OmniAb Inc [OABI]