OmniAb Investor Conference Presentation Deck

Share Information (at time of Split) Common Shares Outstanding Ligand Shareholders SPAC Shareholders Avista Shares Basic Share Count Earnout Shares Ligand Shareholders Avista Total Earnout Shares RSU/Options/Warrants Employee RSU/PSU Employee Options Public Warrants ($11.50 Strike) Avista Warrants ($11.50 Strike) Total RSU/Options/Warrants 82.6 1.3 14.6 98.5 15.0 1.3 16.3 1.7 12.6 7.7 11.3 33.3 ● ● ● Earnout Share Summary Ligand shareholders received 0.75842 earnout shares for every Ligand share owned - 50% of the earnout shares vest at $12.50, 50% vest at $15.00 Stock must trade for 20 out of 30 consecutive trading days at each respective level for vesting to occur 5-year life 33 OmniAb

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