For the quarterly period ended March 31, 2012

Commission File Number: 0-22175

 EMCORE Corporation

Registrant's telephone number, including area code:  (505) 332-5000

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. x Yes ¨ No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). x Yes ¨ 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 definition of “large accelerated filer”, “accelerated filer”, and “smaller reporting company” in Rule 12b-2 of the Exchange Act. ¨ Large accelerated filer x Accelerated filer ¨ Non-accelerated filer ¨ Smaller reporting company

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

As of April 30, 2012, the number of shares outstanding of our no par value common stock totaled 23,910,379.

* Filed herewith

** Previously furnished with our Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2012, as filed on May 3, 2012.