Host-Plus Pty Ltd 10% Ownership Disclosure for EBR Systems

This Form 3 filing discloses that Host-Plus Pty Ltd, as trustee for the HOSTPLUS Pooled Superannuation Trust, has acquired beneficial ownership exceeding 10% of EBR Systems, Inc. common stock. The filing reveals ownership through multiple trust structures: MRCF3 (HP) Trust (2,655,139 shares), MRCF3 (SW) Trust (837,638 shares), MHC Hostplus Co-Investment Trust (783,330 shares), and BCP (HP) Co-Investment Trust (3,349,853 shares), totaling approximately 7.6 million shares. Additionally, the filing discloses warrants exercisable for additional common stock at $0.5891 per share, with expiration dates ranging from 2029 to 2031. The securities are held indirectly through various Australian trust entities, with Host-Plus Pty Ltd exercising voting and dispositive power as sole beneficiary. The filing includes a power of attorney dated December 6, 2024, authorizing representatives to file on behalf of the trust.