To our Shareholders:

A reverse split (the “Reverse ”) of the of EMCORE Corporation (“EMCORE”) has occurred effective as of the close of business on February 15, 2012. The Reverse Stock Split was approved by EMCORE’s shareholders at its June 14, 2011 annual meeting.

At the effective time of the Reverse Stock Split, every four (4) shares of EMCORE issued and outstanding common stock was automatically combined into one (1) issued and outstanding share of EMCORE common stock without any change in the no per share or rights and preferences of EMCORE common stock. As a result of the Reverse Stock Split, holders of certificates representing pre-split shares of EMCORE common stock have the right to receive, upon surrender of their certificates representing such pre-split shares of EMCORE common stock, new book entry shares representing post-split shares of EMCORE common stock at the ratio of one (1) share of post-split common stock for every four (4) shares of pre-split common stock.

Cash will not be issued for fractional shares. Certificated and book shares will be rounded up to the nearest whole share.

All EMCORE stockholders must complete, date, sign and return the enclosed Letter of Transmittal to American Stock Transfer and Trust Company, along with all of your certificates representing pre-split shares of EMCORE common stock. We suggest that you mail the shares in a traceable manner (e.g., registered mail, overnight courier). Any person holding certificates representing pre-split shares of EMCORE common stock must surrender all such certificates registered in such person’s name in order to receive a new statement representing the number of shares of post-split EMCORE common stock to which such person is entitled. EMCORE will be issuing all of the post-split shares through the paperless Direct Registration System (“DRS”), also known as ‘book entry form’. Our transfer agent, American Stock Transfer and Trust Company, will hold the shares in your account. Each time you have a transaction with respect to your DRS shares, you will receive a new DRS statement from American Stock Transfer and Trust Company.

Only upon receipt of your properly completed Letter of Transmittal and your certificate(s) representing pre- split shares of EMCORE common stock will American Stock Transfer and Trust Company forward you your new statement of post-split shares. Additionally, holders of pre-split certificates who are entitled to receive post- split shares of EMCORE common stock will not become a shareholder of record until the pre-split certificates are sent to American Stock Transfer and Trust Company with a properly completed Letter of Transmittal. Please read and follow all instructions on the Letter of Transmittal, and direct any questions you might have to American Stock Transfer and Trust Company at (877) 248-6417 or (718) 921-8317.

Additional information regarding the Reverse Stock Split may be found in EMCORE’s definitive proxy statement and in EMCORE’s Current Report on Form 8-K filed with the Securities and Exchange Commission on May 5, 2011 and January 27, 2012, respectively.

By Order of the Board of Directors,

/s/ Alfredo Gomez Alfredo Gomez Secretary

February 16, 2012 Albuquerque, New Mexico

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