X0708 D LIVE 0002157549 West Street Mezzanine Partners IX Employee Fund LP 200 WEST STREET NEW YORK NY NEW YORK 10282-2198 212-902-1000 DELAWARE None None Limited Partnership true 2026 Michael Brandmeyer 200 West Street New York NY NEW YORK 10282-2198 Executive Officer of the Manager of the Issuer's General Partner Harold Hope 200 West Street New York NY NEW YORK 10282-2198 Executive Officer of the Manager of the Issuer's General Partner Pooled Investment Fund Other Investment Fund false Decline to Disclose 06b false true false true false 0 Goldman Sachs & Co. LLC 361 None None 200 West Street New York NY NEW YORK 10282-2198 All States false Indefinite 0 Indefinite false 0 0 0 0 false West Street Mezzanine Partners IX Employee Fund LP /s/ Amit Sulakhe Amit Sulakhe VP of the Issuer's General Partner 2026-10-05