Blackstone Holdings II L.P. - 31 Dec 2025 SCHEDULE 13G/A Report for Compass Therapeutics, Inc. Common Stock, $0.0001 par value per share (CMPX)

Filing Manager
Blackstone Holdings II L.P.
Reporting Manager
Blackstone Alternative Asset Management Associates LLC
Security
Compass Therapeutics, Inc. Common Stock, $0.0001 par value per share
Symbol
CMPX
Shares outstanding
180,181,824 shares
Disclosed Ownership
6,126,182 shares
Ownership
3.4%
Form type
SCHEDULE 13G/A
Filing time
13 Feb 2026, 16:30:02 UTC
Date of event
31 Dec 2025
SEC
View on sec.gov

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Quoteable Key Fact

"Blackstone Holdings II L.P. disclosed 3.4% ownership in Compass Therapeutics, Inc. Common Stock, $0.0001 par value per share (CMPX) on 31 Dec 2025."

Quick Takeaways

  • Blackstone Holdings II L.P. filed SCHEDULE 13G/A for Compass Therapeutics, Inc. Common Stock, $0.0001 par value per share (CMPX).
  • Disclosed ownership: 3.4%.
  • Date of event: 31 Dec 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 13 Feb 2026, 16:30.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (8)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Blackstone Annex Master Fund L.P. 1.4% 2,447,820 0 2,447,820 /s/ Stephen O'Connor By: Blackstone Alternative Asset Management Associates LLC, its general partner, By: Stephen O'Connor, Authorized Person
Spruce Street Aggregator L.P. 2.1% 3,678,362 0 3,678,362 /s/ Stephen O'Connor By: Blackstone Alternative Asset Management Associates LLC, its general partner, By: Stephen O'Connor, Authorized Person
Blackstone Alternative Asset Management Associates LLC 3.4% 6,126,182 0 6,126,182 /s/ Stephen O'Connor Stephen O'Connor, Authorized Person
Blackstone Holdings II L.P. 3.4% 6,126,182 0 6,126,182 /s/ Victoria Portnoy Victoria Portnoy Managing Director - Assistant Secretary
Blackstone Holdings I/II GP L.L.C. 3.4% 6,126,182 0 6,126,182 /s/ Victoria Portnoy Victoria Portnoy Managing Director - Assistant Secretary
Blackstone Inc. 3.4% 6,126,182 0 6,126,182 /s/ Victoria Portnoy Victoria Portnoy Managing Director - Assistant Secretary
Blackstone Group Management L.L.C. 3.4% 6,126,182 0 6,126,182 /s/ Victoria Portnoy Victoria Portnoy Managing Director - Assistant Secretary
Stephen A. Schwarzman 3.4% 6,126,182 0 6,126,182 /s/ Stephen A. Schwarzman Stephen A. Schwarzman

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