X0708 D LIVE 0002143691 FCP Venture X QP LLC, Series XXI 425 BROADHOLLOW ROAD SUITE 325 MELVILLE NY NEW YORK 11747 646-292-5001 DELAWARE None None Limited Liability Company true 2026 - FCP Partners LLC 425 BROADHOLLOW ROAD SUITE 325 MELVILLE NY NEW YORK 11747 Executive Officer The Manager. Joon Rhee 425 BROADHOLLOW ROAD SUITE 325 MELVILLE NY NEW YORK 11747 Executive Officer Manager of the Manager. Pooled Investment Fund Private Equity Fund false Decline to Disclose 06b 3C 3C.7 false 2026-07-10 false true false 25000 Arete Wealth Management, LLC 44856 None None 1115 West Fulton Market 3rd Floor Chicago IL ILLINOIS 60607 All States true 70000000 57484250 12515750 false 378 5693925 true 0 true 1437106 true Represents a management fee payable to FCP Partners LLC. false FCP Venture X QP LLC, Series XXI /s/ Joon Rhee Joon Rhee Manager of the Manager 2026-09-18