SCHEDULE 13G/A

EXAGEN INC

Common Stock, par value $0.001 per share · CUSIP: 30068X103

Event date: 2025-12-31

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

• RTW Investments, LP

  Shares: 1,148,768.00 · Class: 4.9%

• Roderick Wong

  Shares: 1,148,768.00 · Class: 4.9%

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