The Column Group III GP, LP Increases Stake in Surrozen, Inc. to 23.6%

This Amendment No. 6 to Schedule 13D, filed on May 18, 2026, reports an updated ownership position in Surrozen, Inc. (SRZN) by The Column Group III GP, LP and associated entities. As of March 31, 2026, the reporting persons collectively hold 2,962,544 shares of Common Stock, representing a 23.6% ownership stake. This filing follows several previous amendments and primarily serves to update the aggregate percentage of Common Stock owned due to dilution from the Issuer's sales of additional shares since the original filing. The reporting entities include The Column Group III, LP, The Column Group III-A, LP, and various opportunity funds, with Tim Kutzkey and Peter Svennilson serving as managing partners. The shares reported include record holdings, rights to acquire shares in a second tranche of a private placement within 60 days, and exercisable warrants. Certain warrants remain unexercisable due to beneficial ownership limitations and are excluded from the current totals. No other transactions were reported within the past 60 days.