Filed pursuant to Rule 497(a)
File No. 333-151930
Rule 482ad

		3700 Glenwood Ave., Ste. 530 Raleigh, NC 27612 (919) 719-4770 Fax (919) 719-4777 www.TCAP.com

TRIANGLE CAPITAL CORPORATION PRICES PUBLIC
OFFERING OF COMMON STOCK

RALEIGH, NC — August 23, 2011 — Triangle Capital Corporation (NYSE: TCAP) (“Triangle” or the “Company”) today announced that it has priced a public offering of 3,500,000 shares of common stock in an underwritten public offering. Pricing was set at $17.15 per share, and net proceeds from the offering, after deducting underwriting discounts and estimated offering expenses payable by the Company, are expected to be approximately $57.0 million. The Company intends to invest the net proceeds in lower middle market companies in accordance with its investment objective and strategies, and for working capital and general corporate purposes.

The underwriters have been granted an option, exercisable for 30 days, to purchase up to 525,000 additional shares of common stock to cover overallotments, if any. The underwriters of this offering are Morgan Stanley & Co. LLC, Morgan Keegan & Company, Inc., Robert W. Baird & Co. Incorporated, BB&T Capital Markets, a division of Scott & Stringfellow, LLC, JMP Securities LLC, and Sterne, Agee & Leach, Inc. The offering is subject to customary closing conditions and is expected to close on August 29, 2011.

The shares will be sold pursuant to an effective shelf registration statement on Form N-2 that has been filed with the U.S. Securities and Exchange Commission.

Investors are advised to carefully consider the investment objectives, risks and charges and expenses of the Company before investing. The final prospectus supplement dated August 24, 2011, including the base prospectus dated May 4, 2011, contains this and other information about the Company. The offering may be made only by means of a prospectus and a related prospectus supplement, copies of which may be obtained from Morgan Stanley & Co. LLC, Attn: Prospectus Department, 180 Varick St., 2^nd Floor, New York, NY 10014, Telephone: (866) 718-1649, Email: prospectus@morganstanley.com.

This press release does not constitute an offer to sell or the solicitation of an offer to buy nor will there be any sale of the shares referred to in this press release in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of such state or jurisdiction.

About Triangle Capital Corporation

Triangle Capital Corporation (www.TCAP.com) is a specialty finance company organized to provide customized financing solutions to lower middle market companies located throughout the United States. Triangle’s investment objective is to seek attractive returns by generating current income from debt investments and capital appreciation from equity related investments. Triangle’s investment philosophy is to partner with business owners, management teams and financial sponsors to provide flexible financing solutions to fund growth, changes of control, or other corporate events. Triangle typically

invests $5.0 million — $15.0 million per transaction in companies with annual revenues between $20.0 million and $100.0 million and EBITDA between $3.0 million and $20.0 million.

Triangle has elected to be treated as a business development company under the Investment Company Act of 1940 (“1940 Act”). Triangle is required to comply with a series of regulatory requirements under the 1940 Act as well as applicable NYSE, federal and state laws and regulations. Triangle has elected to be treated as a regulated investment company under the Internal Revenue Code of 1986. Failure to comply with any of the laws and regulations that apply to Triangle could have a material adverse effect on Triangle and its stockholders.

Forward Looking Statements

This press release may contain forward looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Any such statements, other than statements of historical fact, are likely to be affected by other unknowable future events and conditions, including elements of the future that are or are not under the Company’s control, and that the Company may or may not have considered; accordingly, such statements cannot be guarantees or assurances of any aspect of future performance. Actual developments and results are highly likely to vary materially from these estimates and projections of the future and some of these uncertainties are enumerated in Triangle’s filings with the Securities and Exchange Commission. Certain factors that could cause actual results to differ materially from those contained in the forward-looking statements are included in our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, each as filed with the Securities and Exchange Commission. Copies are available on the SEC’s website at www.sec.gov. Such statements speak only as of the time when made, and the Company undertakes no obligation to update any such statement now or in the future.

Contacts

Sheri Blair Colquitt		Steven C. Lilly
Vice President, Investor Relations		Chief Financial Officer
919-719-4784		919-719-4789
scolquitt@tcap.com		slilly@tcap.com