SCHEDULE 13D/A

Surrozen, Inc.

Common Stock, $0.0001 par value per share · CUSIP: 86889P208

Event date: 2026-10-20

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• The Column Group III GP, LPReported CIK 0001790965

  Shares: 2,962,544 · Class: 16.6%

• The Column Group III, LPReported CIK 0001668159

  Shares: 1,391,340 · Class: 7.8%

• The Column Group III-A, LPReported CIK 0001668085

  Shares: 1,571,204 · Class: 8.8%

• The Column Group Opportunity III, LPReported CIK 0001931825

  Shares: 862,068 · Class: 4.8%

• The Column Group Opportunity III GP, LPReported CIK 0001932874

  Shares: 862,068 · Class: 4.8%

• TCG Opportunity III GP, LLCReported CIK 0001932445

  Shares: 862,068 · Class: 4.8%

• Tim KutzkeyReported CIK 0001614186

  Shares: 3,824,612 · Class: 21.5%

• Peter SvennilsonReported CIK 0001606074

  Shares: 3,824,612 · Class: 21.5%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.