UNITED STATES SECURITIES AND EXCHANGE COMMISSION APOLLO INVESTMENT CORPORATION (Exact name of Registrant as specified in its charter) Maryland 52-2439556 Washington, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 814-00646 (State or other jurisdiction of incorporation or organization) ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended March 31, 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 814-00646 APOLLO INVESTMENT CORPORATION (Exact name of Registrant as specified in its charter) Maryland 52-2439556 (State or other jurisdiction of incorporation or organization) (I.R.S ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q For the quarterly period ended December 31, 2018 x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 814-00646 APOLLO INVESTMENT CORPORATION (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (I.R.S. Employe ...