XTSE:MDZ.A MDC Partners, Inc. Class A Quarterly Report 10-Q/A Filing - 6/30/2012

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Mark One)

For the quarterly period ended June 30, 2012

or

For the transition period from ______________ to ______________

Commission file number: 001-13178

MDC Partners Inc.

(Exact name of registrant as specified in its charter)

(646) 429-1800

Registrant’s telephone number, including area code:

Indicate by check mark 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   x No   ¨

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   ¨ No   x

The numbers of shares outstanding as of July 25, 2012 were: 31,859,709 Class A subordinate voting shares and 2,503 Class B multiple voting shares.

Website Access to Company Reports

MDC Partners Inc.’s internet website address is www.mdc-partners.com. The Company’s annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, and any amendments to those reports filed or furnished pursuant to section 13(a) or 15(d) of the Exchange Act, will be made available free of charge through the Company’s website as soon as reasonably practical after those reports are electronically filed with, or furnished to, the Securities and Exchange Commission.  The information found on, or otherwise accessible through, the Company’s website is not incorporated into, and does not form a part of, this quarterly report on Form 10-Q.

Explanatory Note

The purpose of this Amendment No. 1 to the Quarterly Report on Form 10-Q of MDC Partners Inc for the quarterly period ended June 30, 2012 ("Form 10-Q"), as filed with the Securities and Exchange Commission ("SEC") on August 2, 2012, is to furnish Exhibit 101 – Interactive Data File (“XBRL Exhibit”) in accordance with Rule 405 of Regulation S-T. Exhibit 101 to this report provides the condensed consolidated financial statements and related notes from the Form 10-Q formatted in XBRL (eXtensible Business Reporting Language).

No other changes have been made to the Form 10-Q other than the furnishing of the exhibit described above. This Amendment No. 1 does not reflect subsequent events occurring after the original filing date of the Form 10-Q or modify or update in any way disclosures made in the Form 10-Q.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

EXHIBIT INDEX

* These exhibits were previously included in the Company’s Report on Form 10-Q for the quarterly period ended June 30, 2012, filed with the Securities and Exchange Commission on August 2, 2012.