SCHEDULE 13D

IN8bio, Inc.

Common Stock, $0.0001 par value per share · CUSIP: 45674E208

Event date: 2025-12-22

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

• EMILY FAIRBAIRNReported CIK 0001682638

  Shares: 733,293.00 · Class: 7.5%

• Malcom Fairbairn

  Shares: 727,681.00 · Class: 7.5%

• Malcom and Emily Fairbairn 2010 CRUT

  Shares: 724,637.00 · Class: 7.4%

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