Exhibit 99.1

FOR IMMEDIATE RELEASE

THL Credit Announces Fourth Quarter 2012 Financial Results

Declares a Dividend of $0.33 Per Share

BOSTON – March 4, 2013 – THL Credit, Inc. (NASDAQ: TCRD) (“THL Credit” or the “Company”), a direct lender to middle market companies, today announced financial results for its fiscal fourth quarter ended Dec. 31, 2012. Additionally, THL Credit announced that its Board of Directors has declared a first fiscal quarter 2013 dividend of $0.33 per share payable on March 29, 2013, to stockholders of record as of March 15, 2013.

HIGHLIGHTS

“We are pleased with our fourth quarter investment activity,” said James K. Hunt, chief executive officer of THL Credit. “While prepayment activity with associated premiums was higher than expected, our originations remained strong amid an increasingly competitive environment in the middle market. During 2012, we completed 19 new investment transactions and made 7 follow-on investments totaling $277 million in debt and equity capital, excluding the broadly syndicated investments noted above. We have an active pipeline today that includes an increasing number of unsponsored opportunities. While we continue to maintain our cautious view on the economy, we are optimistic that a gradually improving economic backdrop will continue to lead to an increasingly active first half of 2013.”

PORTFOLIO AND INVESTMENT ACTIVITY

In the fourth quarter, THL Credit closed on $94.4 million in six new investment transactions and made $10.7 million of follow-on investments in three existing portfolio companies, excluding the broadly syndicated investments noted above. THL Credit had several realizations on prior investments generating $81.3 million of proceeds. Activity for the quarter included:

These transactions bring the total fair value of THL Credit’s investment portfolio to $394.3 million across 34 portfolio companies at the end of the year, an increase over the prior year end of approximately 48 percent. As of Dec. 31, 2012, the weighted average yield of the debt and income-producing securities in the investment portfolio at their current cost basis was 13.9 percent. The weighted average yield on the debt investments alone at their current cost basis was 13.7 percent.

As of Dec. 31, 2012, THL Credit’s investment portfolio at fair value was allocated 26 percent in first lien debt, including unitranche investments, 18 percent in second lien debt, 47 percent in subordinated debt, 7 percent in income-producing securities and 2 percent in equity.

This compares to its portfolio as of Dec. 31, 2011, which had a fair value of $267.0 million allocated 34 percent in first lien debt, 22 percent in second lien debt, 38 percent in subordinated debt, 5 percent in income-producing securities and 1 percent in equity. The weighted average yield of the debt and income-producing securities in the investment portfolio at their cost basis as of Dec. 31, 2011, was 14.0 percent. The weighted average yield on the debt investments alone at their cost basis as of Dec. 31, 2011, was 13.8 percent.

RESULTS OF OPERATIONS

Investment income

Total investment income for the three months ended Dec. 31, 2012 and 2011 was $16.4 million and $10.9 million, respectively, and consisted of $14.3 million and $10.3 million of interest income on debt securities (which included $1.1 million and $0.8 million, respectively, of PIK interest and $1.0 million and $0.5 million, respectively, of prepayment premiums), $0.9 million and $0.6 million of interest income on income-producing securities, $0.4 million and $0.0 million of dividend income, and $0.8 million and $0.6 million of other income (which includes $0.8 million and $0.6 million, respectively, of fees related to THL Credit’s portfolio company, THL Credit Greenway Fund LLC (“Greenway”)).

Total investment income for the years ended Dec. 31, 2012 and 2011 was $53.1 million and $37.4 million, respectively, and consisted of $47.0 million and $32.8 million of interest income on debt securities (which included $4.1 million and $2.6 million, respectively, of PIK interest and $2.6 million and $1.1 million, respectively, of prepayment premiums), $2.8 million and $2.1 million of interest income on income-producing securities, $0.4 million and $0.3 million of dividend income, and $2.9 million and $2.2 million of other income (which includes $2.6 million and $1.8 million, respectively, of fees related to Greenway).

The increase in the investment income compared to the same periods in prior years is due to the growth of THL Credit’s investment portfolio and an increase in prepayment premiums.

Expenses

Expenses for the three months ended Dec. 31, 2012 and 2011 were $6.8 million and $4.9 million, respectively. Base management fees for the same periods were $1.5 million and $1.0 million; incentive fees totaled $2.3 million and $1.8 million; administrator and other expenses totaled $1.8 million and $1.5 million; fees and expenses related to THL Credit’s credit facility totaled $1.2 million and $0.6 million; and excise and income taxes totaled $0.6 million and $0.02 million, respectively.

Expenses for the years ended Dec. 31, 2012 and 2011 were $22.9 million and $16.4 million, respectively. Base management fees for the same periods were $4.9 million and $4.0 million; incentive fees totaled $7.0 million and $4.8 million; administrator and other expenses totaled $6.3 million and $5.9 million; fees related to THL Credit’s credit facility totaled $4.1 million and $1.7 million, and excise and income taxes totaled $0.6 million and $0.02 million, respectively.

The increase in base management fees and incentive fee expense is due to the growth in both the investment portfolio and net investment income. The increase in expenses and fees related to the credit facility is due to the level of borrowings and the increased commitment size of the revolving loan portion of the credit facility.

Net investment income

Net investment income totaled $9.0 million and $6.0 million, or $0.34 and $0.30 per share based upon weighted average common shares outstanding, for the three months ended Dec. 31, 2012 and 2011, respectively.

Net investment income totaled $30.2 million and $21.0 million, or $1.38 and $1.04 per share based upon weighted average common shares outstanding, for the years ended Dec. 31, 2012 and 2011, respectively.

The increase in net investment income compared to the same period in the prior year is due to the growth of THL Credit’s investment portfolio as well as an increase in prepayment premiums.

Net realized gains

Net realized gains totaled $0.4 million from the sale of $24.0 million of broadly syndicated first lien secured term loans in five companies held for short-term investment purposes for both the three months and year ended Dec. 31, 2012. This compares to net realized gains of $1.0 million from the monetization of THL Credit, Inc.’s equity holdings in Anytime Worldwide, LLC for both the three months and year ended Dec. 31, 2011.

Net change in unrealized appreciation on investments

For the three months ended Dec. 31, 2012 and 2011, THL Credit’s investment portfolio had a net change in unrealized appreciation of $0.9 million and $0.1 million, respectively. As of Dec. 31, 2012 and 2011, net unrealized appreciation on investments was $2.6 million and $3.9 million, respectively.

For the years ended Dec. 31, 2012 and 2011, THL Credit’s investment portfolio had a change in unrealized appreciation of ($1.2) million and $2.1 million, respectively.

The net change in unrealized appreciation compared to the prior periods was driven primarily by the reversal of $1.5 million and $1.1 million for the three months ended Dec. 31, 2012 and 2011 and $2.9 million and $1.8 million for the years ended Dec. 31, 2012 and 2011, respectively, in unrealized appreciation on liquidated portfolio investments, changes in capital market conditions and in the financial performance of certain portfolio companies.

Provision for taxes on unrealized appreciation on investments

The provision for taxes on unrealized appreciation on investments was $0.5 million for both the three months and year ended Dec. 31, 2012. There was no provision for taxes on unrealized appreciation on investments for the three months or year ended Dec. 31, 2011.

Realized and unrealized gain (loss) on interest rate derivative

For the three months ended Dec. 31, 2012, THL Credit’s interest rate derivative agreement, which was entered into on May 10, 2012, had unrealized appreciation of $0.06 million, which was due to capital markets changes impacting interest rate swap spreads. THL Credit also recognized a realized loss related to amounts paid on the interest rate derivate of $0.1 million.

For the year ended Dec. 31, 2012, THL Credit’s interest rate derivative agreement had unrealized depreciation of $1.1 million, which was due to capital markets changes impacting interest rate swap spreads. THL Credit also realized a loss related to amounts paid on the interest rate derivate of $0.2 million.

Net increase in net assets resulting from operations

Net increase in net assets resulting from operations totaled $9.8 million and $7.1 million, or $0.37 and $0.35 per share, respectively, for the three months ended Dec. 31, 2012 and 2011, respectively.

Net increase in net assets resulting from operations totaled $27.6 million and $24.1 million, or $1.26 and $1.20 per share, respectively, for the years ended Dec. 31, 2012 and 2011, respectively.

This increase in net assets from operations is due to the continued growth in net investment income, which is a result of growing the portfolio, along with an increase in prepayment premiums.

FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES

As of Dec. 31, 2012, THL Credit had cash of $4.8 million.

THL Credit’s liquidity and capital resources are derived from its revolving credit facility, term loan facility and cash flows from operations, including investment sales and repayments, and income earned. Its primary use of funds from operations includes making investments in portfolio companies, payment of dividends to stockholders and funding operating expenses it incurs. THL Credit used, and expects to continue to use, these capital resources, together with proceeds from the turnover within the portfolio and from future public and private offerings of securities to finance its investment objectives.

At Dec. 31, 2012, THL Credit had $50.0 million in outstanding borrowings on its term loan with a weighted average interest rate of 4.21 percent. THL Credit borrowed $139.9 million under its revolving credit facility for the year ended Dec. 31, 2012 and repaid the entire amount during the year with proceeds from investments sales and prepayments, its term loan facility issuance in May 2012 and with proceeds from its public offering in September 2012.

For the year ended Dec. 31, 2012, THL Credit’s operating activities used cash of $95.4 million primarily in connection with the purchase of investments, and its financing activities provided cash of $130.9 million from the net proceeds received from the public equity offering as well as net borrowings and used cash of $36.2 million for the payment of dividends to stockholders, financing costs related to the credit facility and offering costs related to the public equity offering.

For the year ended Dec. 31, 2011, THL Credit’s operating activities used cash of $87.2 million primarily in connection with the purchase of investments, and its financing activities provided cash of $5.0 million and used cash of $22.0 million for the payment of dividends to stockholders and financing costs related to the credit facility.

RECENT DEVELOPMENTS

As previously announced in January 2013, THL Credit withdrew its application for a license from the Small Business Administration to operate a subsidiary as a small business investment company (“SBIC”). THL Credit may consider pursuing a new application for a license from the SBA in the future. The Company has transferred the three investments held in the SBIC subsidiary to THL Credit, Inc.

In February 2013, THL Credit made a nominal investment in THL Credit Greenway Fund II LLC (“Greenway II”), following a closing of the fund.

CONFERENCE CALL

THL Credit will host a conference call to discuss these results and its business outlook on March 5, 2013, at 8:30 a.m. Eastern Standard Time. The conference call will be led by James K. Hunt, chief executive officer, and Terrence W. Olson, chief operating officer and chief financial officer, and Sam W. Tillinghast, co-president and chief risk officer.

For those wishing to participate by telephone, please dial (877) 375-9141 (domestic) or (253) 237-1151 (international). Use passcode 98766874. THL Credit will also broadcast the conference call live via its website at www.thlcredit.com. Starting approximately two hours after the conclusion of the call, a replay will be available through March 12, 2013, by dialing (855) 859-2056 (domestic) or (404) 537-3406 (international) and entering passcode 98766874. The replay will also be available on the company’s website.

AVAILABLE INFORMATION

THL Credit’s filings with the Securities and Exchange Commission, press releases, earnings releases, investor presentation and other financial information are available on its website at www.thlcredit.com.

THL CREDIT, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES

THL CREDIT, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

ABOUT THL CREDIT

THL Credit is an externally-managed, non-diversified closed-end management investment company that has elected to be treated as a business development company (BDC) under the Investment Company Act of 1940. THL Credit’s investment objective is to generate both current income and capital appreciation, primarily through investments in privately negotiated debt and equity securities of middle market companies.

THL Credit is headquartered in Boston, with additional investment teams in Los Angeles, New York and Houston. THL Credit is a direct lender to middle market companies and invests in subordinated, or mezzanine, debt and second lien secured debt, which may include an associated equity component such as warrants, preferred stock or other similar securities. THL Credit also selectively invests in first lien secured loans that generally have structures with higher interest rates, which include unitranche investments, or loan structures that combine characteristics of traditional first lien senior secured loans as well as second lien and subordinated loans. In certain instances THL Credit will also make direct equity investments, including equity investments into or through funds, and may also selectively invest in more broadly syndicated first lien secured loans from time to time. THL Credit’s investment activities are managed by THL Credit Advisors LLC, an investment adviser registered under the Investment Advisers Act of 1940.

FORWARD-LOOKING STATEMENTS

Statements made in this press release may constitute forward-looking statements. Such statements reflect various assumptions by THL Credit concerning anticipated results and are not guarantees of future performance. The accuracy of such statements involves known and unknown risks, uncertainties and other factors that, in some ways, are beyond management’s control, including the factors described from time to time in filings by THL Credit with the Securities and Exchange Commission. THL Credit undertakes no duty to update any forward-looking statements made herein. All forward-looking statements speak only as of the date of this press release.

Investor Contact:

THL Credit, Inc.

Terrence W. Olson, COO & CFO

800-450-4424

Media Contact:

Sard Verbinnen & Co

Michael Henson

212-687-8080

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