X0708 D/A LIVE 0001502130 MacKay Shields High Yield Active Core Fund LP 299 Park Avenue 32nd Floor New York NY NEW YORK 10171 212-758-5400 DELAWARE None None Limited Partnership true N/A MacKay Shields LLC 299 Park Avenue 32nd Floor New York NY NEW YORK 10171 Promoter Investment Manager of the Issuer N/A MacKay Shields High Yield Active Core Fund GP LLC 299 Park Avenue 32nd Floor New York NY NEW YORK 10171 Promoter General Partner of the Issuer Rene A. Bustamante 506 Carnegie Center Drive Suite 200 Princeton NJ NEW JERSEY 08540 Executive Officer Executive Managing Director of MacKay Shields LLC Pooled Investment Fund Hedge Fund false Decline to Disclose 06b 3C 3C.1 true 0001502130-25-000003 2009-03-01 true true true Limited Partnership Interests false 2000000 NYLIFE Distributors LLC 35350 None None 30 Hudson Street Jersey City NJ NEW JERSEY 07302 All States false McMorgan & Company Capital Advisors LLC 137222 None None 33 New Montgomery Street Suite 2000 San Francisco CA CALIFORNIA 94105 All States false McMorgan & Company LLC 115060 None None 33 New Montgomery Street Suite 2000 San Francisco CA CALIFORNIA 94105 All States false Indefinite 1390264214 Indefinite false 90 3300000 true 0 The Investment Manager of the Issuer shares a portion of its management fee received from the Issuer with one or more of the Issuer's placement agents. Such placement agents may receive other fees (e.g., sales loads) payable directly 0 [cont'd from Item 15] to the placement agent (outside the Issuer) in addition to (and not deducted from) investment amounts; the amount of such fees are unknown to the Issuer and the Investment Manager. false MacKay Shields High Yield Active Core Fund LP /s/Rene Bustamante Rene A. Bustamante Executive Managing Director of Investment Manager 2026-09-29