SCHEDULE 13G/A

IO BIOTECH INC

Common stock, par value $0.001 per share · CUSIP: 449778109

Event date: 2025-09-30

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

• Vivo Capital IX, LLC

  Shares: 0.00 · Class: 0%

• Vivo Capital Fund IX, L.P.

  Shares: 0.00 · Class: 0%

• Vivo Opportunity, LLC

  Shares: 3,157,894.00 · Class: 4.6%

• Vivo Opportunity Fund Holdings, L.P.

  Shares: 3,157,894.00 · Class: 4.6%

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