Exhibit 99.1

FS Investment Corporation Announces Financial Results for its Fourth Quarter and Year Ended

December 31, 2013 and Provides Details of Stockholder Conference Call

PHILADELPHIA, PA, March 5, 2014 – FS Investment Corporation (“FSIC”, “we” or “us”), a business development company focused primarily on investing in the debt securities of private U.S. companies, announced its operating results for the quarter and year ended December 31, 2013. FSIC will hold a conference call at 10:00 a.m., Eastern Time, on Wednesday, March 12, 2014 to discuss these results. Information for those interested in participating in the call can be found below.

Financial Highlights for the Quarter Ended December 31, 2013¹

Financial Highlights for the Year Ended December 31, 2013¹

“We are pleased with our fourth quarter and full year 2013 financial results,” said Michael C. Forman, Chairman and Chief Executive Officer of FSIC. “Our focus on directly originated, senior secured investments and our ability to leverage the broad investment capabilities of the GSO / Blackstone platform enabled us to increase our distribution rate twice during the year and to once again generate a strong risk-adjusted return for our stockholders. Although we recognize that much work lies ahead, we believe that our experience, scale, partnership with GSO / Blackstone and five-year track record of strong performance position us well for a successful listing.”

Operating Results

Portfolio Highlights

Total Portfolio Activity

Direct Origination Activity

Balance Sheet Summary

Reconciliation of Non-GAAP Financial Measures

Conference Call Information

FSIC will hold its annual stockholder conference call on Wednesday, March 12, 2014, at 10:00 a.m., Eastern Time. Interested parties are invited to participate via telephone or webcast, which will be hosted on a webcast link located on the “Investor Relations” section of our website (www.fsinvestmentcorp.com). For participants joining via telephone, please dial (800) 446-1671 at least 10 minutes prior to the beginning of the conference call and provide the confirmation code 36801730 when prompted. An audio archive of the call will be available for replay. The link to the audio archive can be found under the “Investor Relations” section of FSIC’s website and will be available for a period of 30 days following the call.

Supplemental Information

FSIC will provide a financial information presentation with additional details on its financial results for the three months and year ended December 31, 2013 in advance of the March 12, 2014 conference call. In the presentation, FSIC intends to also include select portfolio and financial information for the period beginning on January 1, 2014, and ending on February 28, 2014. This interim information is being provided in connection with the proposed listing of FSIC’s shares of common stock on the New York Stock Exchange LLC (“NYSE”). This presentation will be made available under the “Investor Relations” section of FSIC’s website (www.fsinvestmentcorp.com). For inquiries, please contact Ben Holman at (215) 220-6266.

About FSIC

FSIC, an investment fund sponsored by Franklin Square Capital Partners (“Franklin Square”), is a publicly registered business development company (“BDC”). A BDC such as FSIC is a type of investment fund that enables investors to access investments in private U.S. companies. FSIC focuses primarily on investing in the debt securities of private companies throughout the U.S., with the investment objectives of generating current income and, to a lesser extent, long-term capital appreciation for its investors. FSIC is managed by FB Income Advisor, LLC, an affiliate of Franklin Square, and is sub-advised by GSO / Blackstone Debt Funds Management LLC, an affiliate of GSO Capital Partners LP (“GSO”). GSO, with approximately $65 billion in assets under management as of December 31, 2013, is the credit platform of Blackstone. For more information, please visit www.fsinvestmentcorp.com.

About Franklin Square

Franklin Square is a leading manager of alternative investment funds designed to enhance investors’ portfolios by providing access to asset classes, strategies and asset managers that typically have been available to only the largest institutional investors. The firm’s funds offer “endowment-style” investment strategies that help construct diversified portfolios and manage risk. Franklin Square strives not only to maximize investment returns but also to set the industry standard for best practices by focusing on transparency, investor protection and education for investment professionals and their clients.

Founded in Philadelphia in 2007, Franklin Square quickly established itself as a leader in the world of alternative investments by introducing innovative credit-based income funds, including the industry’s first non-traded BDC. The firm currently manages four funds with over $10 billion in assets as of December 31, 2013. For more information, please visit www.franklinsquare.com.

Other Information

The information in this press release is summary information only and should be read in conjunction with FSIC’s annual report on Form 10-K for the year ended December 31, 2013, which FSIC filed with the Securities and Exchange Commission (the “SEC”) on February 28, 2014, as well as FSIC’s other reports filed with the SEC. A copy of FSIC’s annual report on Form 10-K for the year ended December 31, 2013 and FSIC’s other reports filed with the SEC can be found on FSIC’s website at www.fsinvestmentcorp.com and the SEC’s website at www.sec.gov.

Certain Information About Distributions

The determination of the tax attributes of FSIC’s distributions is made annually as of the end of its fiscal year based upon its taxable income and distributions paid, in each case, for the full year. Therefore, a determination as to the tax attributes of the distributions made on a quarterly basis may not be representative of the actual tax attributes for a full year. FSIC intends to update stockholders quarterly with an estimated percentage of its distributions that resulted from taxable ordinary income. The actual tax characteristics of distributions to stockholders will be reported to stockholders annually on Form 1099-DIV.

The payment of future distributions on FSIC’s shares of common stock is subject to the discretion of its board of directors and applicable legal restrictions, and therefore, there can be no assurance as to the amount or timing of any such future distributions.

FSIC may fund its cash distributions to stockholders from any sources of funds available to it, including expense reimbursements from Franklin Square, as well as offering proceeds, borrowings, net investment income from operations, capital gains proceeds from the sale of assets, non-capital gains proceeds from the sale of assets and dividends or other distributions paid to it on account of preferred and common equity investments in portfolio companies. FSIC has not established limits on the amount of funds it may use from available sources to make distributions. There can be no assurance that FSIC will be able to pay distributions at a specific rate or at all.

Forward-Looking Statements

This announcement may contain certain forward-looking statements, including statements with regard to future events or the future performance or operations of FSIC. Words such as “believes,” “expects,” “projects,” and “future” or similar expressions are intended to identify forward-looking statements. These forward-looking statements are subject to the inherent uncertainties in predicting future results and conditions. Certain factors could cause actual results to differ materially from those projected in these forward-looking statements. Factors that could cause actual results to differ materially include changes in the economy, risks associated with possible disruption in FSIC’s operations or the economy due generally to terrorism or natural disasters, future changes in laws or regulations and conditions in FSIC’s operating area, the ability of FSIC to complete the listing of its shares of common stock on the NYSE, and the price at which shares of common stock may trade on the NYSE. Some of these factors are enumerated in the filings FSIC makes with the SEC. FSIC undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

The press release above contains summaries of certain financial and statistical information about FSIC. The information contained in this press release is summary information that is intended to be considered in the context of FSIC’s SEC filings and other public announcements that FSIC may make, by press release or otherwise, from time to time. FSIC undertakes no duty or obligation to publicly update or revise the information contained in this press release. In addition, information related to past performance, while helpful as an evaluative tool, is not necessarily indicative of future results, the achievement of which cannot be assured. Investors should not view the past performance of FSIC, or information about the market, as indicative of FSIC’s future results.

Non-GAAP Financial Measures

This press release contains certain financial measures that have not been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). FSIC uses these non-GAAP financial measures internally in analyzing financial results and believes that the use of these non-GAAP financial measures is useful to investors as an additional tool to evaluate ongoing results and trends and in comparing FSIC’s financial results with other business development companies.

Non-GAAP financial measures are not meant to be considered in isolation or as a substitute for comparable GAAP financial measures, and should be read only in conjunction with FSIC’s consolidated financial statements prepared in accordance with GAAP. A reconciliation of non-GAAP financial measures to the most directly comparable GAAP measures has been provided in this press release, and investors are encouraged to review the reconciliation.