X0708 D LIVE 0002060985 Castle Island Ventures IV Feeder, L.P. 374 CONGRESS STREET, SUITE 301 BOSTON MA MASSACHUSETTS 02210 (617) 401-4017 CAYMAN ISLANDS None None Limited Partnership true 2025 Management Company Castle Island Management, LLC 374 Congress Street, Suite 301 Boston MA MASSACHUSETTS 02210 Promoter Management Company of the Issuer General Partner Castle Island GP IV, LLC 374 Congress Street, Suite 301 Boston MA MASSACHUSETTS 02210 Promoter General Partner of the Issuer Matthew Walsh 374 Congress Street, Suite 301 Boston MA MASSACHUSETTS 02210 Executive Officer Managing Member of the General Partner of the Issuer Nicolas Carter 374 Congress Street, Suite 301 Boston MA MASSACHUSETTS 02210 Executive Officer Managing Member of the General Partner of the Issuer Sean Judge 374 Congress Street, Suite 301 Boston MA MASSACHUSETTS 02210 Executive Officer Managing Member of the General Partner of the Issuer Pooled Investment Fund Venture Capital Fund false Decline to Disclose 06b 3C 3C.7 false true false true false 0 Indefinite 0 Indefinite false 0 0 0 0 true The Issuer's General Partner or an affiliate of the Issuer's General Partner may be entitled to receive a management fee in accordance with the Issuer's governing documentation, as amended from time to time. false Castle Island Ventures IV Feeder, L.P. /s/ Matthew Walsh Matthew Walsh Managing Member of the GP of the Issuer 2025-10-30