UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) or (g) OF THE

SECURITIES EXCHANGE ACT OF 1934

Triangle Capital Corporation

(Exact name of registrant as specified in its charter)

Maryland	06-1798488
(Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)

3700 Glenwood Avenue, Suite 530, Raleigh, North Carolina	27612
(Address of principal executive offices)	(Zip Code)

Securities to be registered pursuant to Section 12(b) of the Act:

Title of each class to be so registered	Name of each exchange on which each class is to be registered
7.00% Senior Notes due 2019	New York Stock Exchange

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box.  x

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box.  ¨

Securities Act registration statement file number to which this form relates: File No. 333-175160

Securities to be registered pursuant to Section 12(g) of the Act: None

Item 1. Description of Registrant’s Securities to Be Registered.

The description of the 7.00% Senior Notes due 2019 (the “Notes”) of Triangle Capital Corporation, a Maryland corporation (the “Registrant”), is incorporated by reference to the information set forth under the caption “Description of the Notes” in the prospectus supplement dated February 28, 2012 and filed pursuant to Rule 497 under the Securities Act of 1933, as amended, in the form in which it was filed on February 28, 2012 with the Securities and Exchange Commission. The prospectus supplement supplements the prospectus contained in the Registrant’s registration statement on Form N-2 (File No. 333-175160), which was declared effective by the Securities and Exchange Commission on October 21, 2011. The Notes are expected to be listed on the New York Stock Exchange.

Item 2. Exhibits.

Pursuant to the Instructions as to exhibits for registration statements on Form 8-A, the documents listed below are filed as exhibits to this Registration Statement:

Number	Exhibit
4.1	Indenture, dated March 2, 2012 between the Registrant and The Bank of New York Mellon Trust Company, N.A. (Filed as Exhibit (d)(5) to the Registrant’s Post-Effective Amendment No. 2 on Form N-2 filed with the Securities and Exchange Commission on March 2, 2012 and incorporated herein by reference).
4.2	First Supplemental Indenture, dated March 2, 2012 between the Registrant and The Bank of New York Mellon Trust Company, N.A. (Filed as Exhibit (d)(6) to the Registrant’s Post-Effective Amendment No. 2 on Form N-2 filed with the Securities and Exchange Commission on March 2, 2012 and incorporated herein by reference)
4.3	Form of 7.00% Senior Note due 2019 (Filed as Exhibit (d)(7) to the Registrant’s Post-Effective Amendment No. 2 on Form N-2 filed with the Securities and Exchange Commission on March 2, 2012 and incorporated herein by reference).

SIGNATURES

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

	Triangle Capital Corporation
Date: March 2, 2012	By:	/s/ Steven C. Lilly
		Steven C. Lilly
		Chief Financial Officer

EXHIBIT INDEX

Number	Exhibit
4.1	Indenture, dated March 2, 2012 between the Registrant and The Bank of New York Mellon Trust Company, N.A. (Filed as Exhibit (d)(5) to the Registrant’s Post-Effective Amendment No. 2 on Form N-2 filed with the Securities and Exchange Commission on March 2, 2012 and incorporated herein by reference).
4.2	First Supplemental Indenture, dated March 2, 2012 between the Registrant and The Bank of New York Mellon Trust Company, N.A. (Filed as Exhibit (d)(6) to the Registrant’s Post-Effective Amendment No. 2 on Form N-2 filed with the Securities and Exchange Commission on March 2, 2012 and incorporated herein by reference)
4.3	Form of 7.00% Senior Note due 2019 (Filed as Exhibit (d)(7) to the Registrant’s Post-Effective Amendment No. 2 on Form N-2 filed with the Securities and Exchange Commission on March 2, 2012 and incorporated herein by reference).