UNITED STATES

 SECURITIES AND EXCHANGE COMMISSION

Washington , D.C. 20549

FORM 10-Q/A

(MARK ONE)

x             QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2013

¨             TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                    to

Commission file number: 001-36139

777 Third Avenue, 37th Floor

New York , New York 10017

(Address of principal executive offices)

212-319-7676

(Issuer’s telephone number)

Indicate by checkmark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.   Yes  ¨    No  x

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T ( § 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes   x    No  ¨

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes   x    No  ¨

As of December 10, 2013, 12,683,125 shares of common stock, par value $0.0001 per share were issued and outstanding.

EXPLANATORY NOTE

The purpose of this amendment on Form 10-Q/A to Quartet Merger Corp.’s quarterly report on Form 10-Q for the quarterly period ended September 30, 2013, filed with the Securities and Exchange Commission on December 12, 2013 (“Form 10-Q”), is solely to furnish Exhibit 101 to the Form 10-Q, as required by Rule 405 of Regulation S-T.

No other changes have been made to the Form 10-Q. This Form 10-Q/A speaks as of the original filing date of the Form 10-Q, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in Form 10-Q.

Item 6.  Exhibits.

* Previously filed.

** As provided in Rule 406T of Regulation S-T, this information shall not be deemed “filed” for purposes of Section 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934 or otherwise subject to liability under those sections.

SIGNATURES

In accordance with the requirements of the Exchange Act, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.