SCHEDULE 13G/A

Compass Therapeutics Inc

Common Stock, par value $0.0001 per share · CUSIP: 20454B104

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

• TANG CAPITAL MANAGEMENT, LLC

  Shares: 17,176,510.00 · Class: 9.99%

• KEVIN TANG

  Shares: 17,176,510.00 · Class: 9.99%

• TANG CAPITAL PARTNERS, LP

  Shares: 10,274,944.00 · Class: 5.98%

• TANG CAPITAL PARTNERS INTERNATIONAL, LP

  Shares: 5,568,566.00 · Class: 3.24%

• TANG CAPITAL PARTNERS III, INC

  Shares: 999,750.00 · Class: 0.58%

• TANG CAPITAL PARTNERS IV, INC

  Shares: 333,250.00 · Class: 0.19%

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