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Preliminary Proxy Statement

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material Pursuant to §240.14a-12

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Important Notice of Availability of Proxy Materials for the Stockholder Meeting of NEOPHOTONICS CORPORATION To Be Held On: June 7, 2016 at 10:00 AM Pacific Time at 2911 Zanker Road, San Jose, CA 95134 This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. we encourage you to access and review all of the important information contained in the proxy materials before voting. If you want to receive a paper or e-mail copy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before 5/27/16. Please visit http://www.astproxyportal.com/ast/16875/, where the following materials are available for view: • Notice of Annual Meeting of Stockholders • Proxy Statement • Form of Electronic Proxy Card • Annual Report on Form 10-K TO REqUEST MATERIAL: TELEPHONE: 888-Proxy-NA (888-776-9962) 718-921-8562 (for international callers) E-MAIL: info@amstock.com wEBSITE: http://www.amstock.com/proxyservices/requestmaterials.asp ONLINE: To access your online proxy card, please visit www.voteproxy.com and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at www.voteproxy.com up until 11:59 PM Eastern Time June 6, 2016. IN PERSON: You may vote your shares in person by attending the Annual Meeting. TELEPHONE: To vote by telephone, please visit www.voteproxy.com to view the materials and to obtain the toll free number to call. MAIL: You may request a card by following the instructions above. TO VOTE: 1. Election of Directors: NOMINEES: Rajiv Ramaswami Ihab Tarazi Please note that you cannot use this notice to vote by mail. 2. Ratification of the selection by our Audit Committee of Deloitte & Touche LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2016. NOTE: In their discretion, the proxies are authorized to vote upon such other business as may properly come before the Annual Meeting of Stockholders or any adjournment or postponement thereof. COMPANY NUMBER ACCOUNT NUMBER CONTROL NUMBER

ANNUAL MEETING OF STOCKHOLDERS OF NEOPHOTONICS CORPORATION June 7, 2016 INTERNET - Access “www.voteproxy.com” and follow the on-screen instructions or scan the QR code with your smartphone. Have your proxy card available when you access the web page. TELEPHONE - Call toll-free 1-800-PROXIES (1-800-776-9437) in the United States or 1-718-921-8500 from foreign countries from any touch-tone telephone and follow the instructions. Have your proxy card available when you call. Vote online/phone up until 11:59 PM EST June 6, 2016. MAIL - Sign, date and mail your proxy card in the envelope provided as soon as possible. IN PERSON - You may vote your shares in person by attending the Annual Meeting. GO GREEN - e-Consent makes it easy to go paperless. With e-Consent, you can quickly access your proxy material, statements and other eligible documents online, while reducing costs, clutter and paper waste. Enroll today via www.amstock.com to enjoy online access. Please detach along perforated line and mail in the envelope provided IF you are not voting via telephone or the Internet. 20203000000000000000 3 060716 Touche LLP as our independent registered public accounting firm for may properly come before the Annual Meeting of Stockholders or any adjournment or changes to the registered name(s) on the account may not be submitted via Note: Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person. THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" ALL NOMINEES LISTED IN PROPOSAL NO. 1, AND "FOR" PROPOSAL NO. 2. PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE x The Board of Directors recommends you vote FOR the following: 1. Election of Directors: NOMINEES: FOR ALL NOMINEESO Rajiv Ramaswami O Ihab Tarazi WITHHOLD AUTHORITY FOR ALL NOMINEES FOR ALL EXCEPT (See instructions below) INSTRUCTIONS: To withhold authority to vote for any individual nominee(s), mark “FOR ALL EXCEPT” and fill in the circle next to each nominee you wish to withhold, as shown here: The Board of Directors recommends you vote FOR the following proposal: FOR AGAINST ABSTAIN 2. Ratification of the selection by our Audit Committee of Deloitte & the fiscal year ending December 31, 2016. NOTE: In their discretion, the proxies are authorized to vote upon such other business as postponement thereof. To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that this method. Signature of Stockholder Date: Signature of StockholderDate: NOTICE OF INTERNET AVAILABILITY OF PROXY MATERIAL: The Notice of Meeting, proxy statement and proxy card are available at http://www.astproxyportal.com/ast/16875/ COMPANY NUMBER ACCOUNT NUMBER PROXY VOTING INSTRUCTIONS