SCHEDULE 13G/A

TSCAN THERAPEUTICS INC

Voting Common Stock · CUSIP: 89854M101

Event date: 2025-03-31

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

• EcoR1 Capital, LLC

  Shares: 662,833.00 · Class: 1.3%

• Oleg Nodelman

  Shares: 662,833.00 · Class: 1.3%

• EcoR1 Capital Fund Qualified, L.P.

  Shares: 623,967.00 · Class: 1.2%

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