Blackstone Annex Master Fund L.P.

Activist investor & 5%+ owner · SC 13D/13G filings

Total Filings

Stocks Covered

Latest Filing

Feb 13, 2026

Filings

Compass Therapeutics, Inc.

SC 13G/A · Feb 13, 2026

1.4%

2.4M shares

Compass Therapeutics, Inc.

SC 13G · Aug 2, 2024

2.6%

3.6M shares

Infinite Acquisition Corp.

SC 13G/A · Feb 10, 2023

0.0%

0 shares

Infinite Acquisition Corp.

SC 13G/A · Feb 11, 2022

7.2%

2.0M shares