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Exhibit 21.1

List of Principal Subsidiaries of OmniAb, Inc.

In connection with the separation of OmniAb, Inc. from Ligand Pharmaceuticals Incorporated, the following entities will become wholly owned subsidiaries of OmniAb, Inc.

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Wholly Owned Subsidiary		Place of Incorporation
​	​	​
Ab Initio Biotherapeutics, Inc.	​	Delaware
Crystal Bioscience, Inc.	​	California
Icagen, LLC	​	Delaware
Taurus Biosciences, LLC	​	Delaware
xCella Biosciences, Inc.	​	Delaware

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