X0609 4 2026-08-21 0001347123 EBR Systems, Inc. NONE 0002041658 Host-Plus Pty Ltd as trustee for the HOSTPLUS Pooled Superannuation Trust true LEVEL 9, 114 WILLIAM STREET MELBOURNE VIC C3 30000 AUSTRALIA false false true false 0 Common Stock 2026-08-21 4 P 0 7700119 2.70 A 11049972 I By BB6 Service (HP) Coinvestment Trusco Pty Ltd atf BCP (HP) Co-Investment Trust Common Stock 3492778 I By MRCF3 Service (HP) Pty Ltd atf MRCF 3 (HP) Trust Common Stock 783330 I By MHC Fund Services B Pty Ltd atf MHC Hostplus Co-Investment Trust Represents shares of the Issuer's common stock underlying CHESS Depositary Interests ("CDIs"). The CDIs are traded on the Australian Securities Exchange (the "ASX") and are held by CHESS Depositary Nominees Pty Limited, a subsidiary of ASX Limited, the company that operates the ASX. On August 21, 2026, BB6 Service (HP) Coinvestment Trusco Pty Ltd as trustee for BCP (HP) Co-Investment Trust acquired 77,001,190 CDIs on completion of Tranche 2 of the institutional placement by the Issuer, which was approved by the Issuer's shareholders on August 19, 2026 and settled on August 21, 2026, at a price of A$0.38 per CDI (equivalent to A$3.80 per share of common stock, or approximately US$2.70 per share based on an AUD/USD exchange rate of 0.71 on the settlement date). The securities are held directly by BB6 Service (HP) Coinvestment Trusco Pty Ltd as trustee of BCP (HP) Co-Investment Trust. The Reporting Person is the sole beneficiary of BCP (HP) Co-Investment Trust and exercises sole dispositive power over the securities held by BB6 Service (HP) Coinvestment Trusco Pty Ltd. Includes 837,638 shares underlying 8,376,380 CDIs previously held by MRCF3 Service (SW) Pty Ltd as trustee for MRCF 3 (SW) Trust, which were transferred to MRCF3 Service (HP) Pty Ltd as trustee of MRCF 3 (HP) Trust subsequent to the Reporting Person's most recent report. Such transfer constituted a change in the Reporting Person's form of ownership that was exempt from reporting pursuant to Rule 16a-13 under the Securities Exchange Act. The securities are held directly by MRCF3 Service (HP) Pty Ltd as trustee of MRCF 3 (HP) Trust. The Reporting Person is the sole beneficiary of MRCF 3 (HP) Trust and exercises sole dispositive power over the securities held by MRCF3 Service (HP) Pty Ltd. The Securities are held directly by MHC Fund Services B Pty Ltd as trustee for MHC Hostplus Co-Investment Trust. The Reporting Person is the sole beneficiary of MHC Hostplus Co-Investment Trust and exercises shared dispositive power over the securities held by MHC Fund Services B Pty Ltd. /s/ Greg Clerk, as duly appointed attorney for Host-Plus Pty Limited as trustee of the Hostplus Pooled Superannuation Trust, having no notice of revocation of the power of attorney dated 6 December 2024 2026-08-25 /s/ Susan Orr, as duly appointed attorney for Host-Plus Pty Limited as trustee of the Hostplus Pooled Superannuation Trust, having no notice of revocation of the power of attorney dated 6 December 2024 2026-08-25