Exhibit 99.1

APOLLO INVESTMENT CORPORATION

ANNOUNCES FOURTH QUARTER AND FISCAL YEAR 2012 EARNINGS RELEASE

AND CONFERENCE CALL

New York, NY – April 26, 2012 – Apollo Investment Corporation (NASDAQ: AINV) (the “Company”) announced today that it will report fourth quarter and fiscal year results for the period ended March 31, 2012 at approximately 7:30 a.m. Eastern Time on Wednesday, May 23, 2012.

The Company will also host a conference call on Wednesday, May 23, 2012 at 10:00 a.m. Eastern Time. All interested parties are welcome to participate in the conference call by dialing (888) 802-8579 approximately 5-10 minutes prior to the call; international callers should dial (973) 633-6740. Participants should reference Apollo Investment Corporation or Conference ID # 75904920 when prompted. A simultaneous webcast of the conference call will be available to the public on a listen-only basis and can be accessed through the Event Calendar in the Investor Relations section of our website at www.apolloic.com. Following the call you may access a replay of the event either telephonically or via audio webcast. The telephonic replay will be available approximately two hours after the live call and through June 6, 2012 by dialing (800) 585-8367; international callers please dial (404) 537-3406, reference Conference ID # 75904920. A replay of the audio webcast will also be available later that same day. To access the audio webcast please visit the Event Calendar in the Investor Relations section of our website at www.apolloic.com.

About Apollo Investment Corporation

Apollo Investment Corporation (NASDAQ: AINV) is a closed-end investment company that has elected to be treated as a business development company under the Investment Company Act of 1940. The Company provides private debt market solutions to middle market companies in the form of senior secured, mezzanine and asset based loans and may also acquire equity interests. The Company seeks to provide private financing solutions for private companies that do not have access to the more traditional providers of credit. Apollo Investment Corporation is managed by Apollo Investment Management, L.P., an affiliate of Apollo Global Management, LLC, a leading global alternative investment manager. For more information, please visit http://www.apolloic.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements involve risks and uncertainties, including, but not limited to, statements as to our future operating results; our business prospects and the prospects of our portfolio companies; the impact of investments that we expect to make; the dependence of our future success on the general economy and its impact on the industries in which we invest; the ability of our portfolio companies to achieve their objectives; our expected financings and investments; the adequacy of our cash resources and working capital; and the timing of cash flows, if any, from the operations of our portfolio companies.

We may use words such as “anticipates,” “believes,” “expects,” “intends,” “will,” “should,” “may” and similar expressions to identify forward-looking statements. Such statements are based on currently available operating, financial and competitive information and are subject to various risks and uncertainties that could cause actual results to differ materially from our historical experience and our present expectations. Undue reliance should not be placed on such forward-looking statements as such statements speak only as of the date on which they are made. We do not undertake to update our forward-looking statements unless required by law.

Contact

Elizabeth Besen

Investor Relations Manager

Apollo Investment Corporation

(212) 822-0625

ebesen@apolloic.com

SOURCE: Apollo Investment Corporation