SCHEDULE 13G/A

Compass Therapeutics Inc

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

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

• Blackstone Annex Master Fund L.P.

  Shares: 2,447,820 · Class: 1.4%

• Spruce Street Aggregator L.P.

  Shares: 3,678,362 · Class: 2.1%

• Blackstone Alternative Asset Management Associates LLC

  Shares: 6,126,182 · Class: 3.4%

• Blackstone Holdings II L.P.

  Shares: 6,126,182 · Class: 3.4%

• Blackstone Holdings I/II GP L.L.C.

  Shares: 6,126,182 · Class: 3.4%

• Blackstone Inc.

  Shares: 6,126,182 · Class: 3.4%

• Blackstone Group Management L.L.C.

  Shares: 6,126,182 · Class: 3.4%

• Stephen A. Schwarzman

  Shares: 6,126,182 · Class: 3.4%

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