Apollo IG Core Replacement, L.P.

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year. On June 30, 2026, Apollo IG Core entered into a Second Amended and Restated Agreement of Limited Partnership (the “Partnership Agreement”) with Apollo IG Core Replacement Advisors, L.P., a Cayman Islands exempted limited partnership, in its capacity as general partner of Apollo IG Core (the “General Partner”), and each of Apollo IG Core’s limited partners, which Partnership Agreement implements the addition of two additional aggregator entities into the fund structure. The Partnership Agreement amends and restates in its entirety the Amended and Restated Agreement of Limited Partnership of Apollo IG Core, dated as of August 1, 2025. A description of the Partnership Agreement was included under “Item 1. Business - General Overview - Partnership Agreement” of Apollo IG Core’s Annual Report on Form 10-K and is incorporated by reference herein. The foregoing description of the Partnership Agreement does not purport to be complete and is qualified in its entirety by reference to the Partnership Agreement, a copy of which is filed as Exhibit 3.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 8.01 Other Events. On July 1, 2026, the investment manager of Apollo IG Core determined the net asset value of Apollo IG Core as of May 31, 2026 was $1,836.8 million. For additional information, please see Exhibit 99.1 to this Current Report on Form 8-K, which is incorporated herein by reference.