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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on May 22, 2019. Meeting Information NANOMETRICS INCORPORATED Meeting Type: Annual Meeting For holders as of: March 25, 2019 Date: May 22, 2019 Time: 9:00 A.M. Local Time Location: Nanometrics Incorporated 1550 Buckeye Drive Milpitas, CA 95035 You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet or by mail. You may view the proxy materials online at or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. NANOMETRICS INCORPORATED 1550 BUCKEYE DRIVE MILPITAS, CA 95035 E72953-P20180 See the reverse side of this notice to obtain proxy materials and voting instructions.



Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT ANNUAL REPORT How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents for this and future stockholders meetings, you must request one, otherwise you will not receive one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:  1) BY INTERNET:  2) BY TELEPHONE: 1-800-579-1639  3) BY E-MAIL*: * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box markedby the arrow (located on the following page) in the subject line. g XXXX XXXX XXXX XXXX g XXXX XXXX XXXX XXXX Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 8, 2019 to facilitate timely delivery. How To Vote E72954-P20180 Please Choose One of the Following Voting Methods Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to Have the information that is printed in the boxmarked by the arrow (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. g XXXX XXXX XXXX XXXX



Voting Items The Board of Directors recommends you vote FOR the following: 1. Election of Directors  Nominees: 01) Edward J. Brown, Jr.  02) Robert Deuster  03) Pierre-Yves Lesaicherre, Ph.D.  04) Bruce C. Rhine  05) Christopher A. Seams  06) Timothy J. Stultz, Ph.D.  07) Christine A. Tsingos   The Board of Directors recommends you vote FOR proposals 2 and 3. 2. To approve, on an advisory basis, the compensation of Nanometrics' named executive officers, as disclosed in the proxy statement.  3. To ratify the appointment of PricewaterhouseCoopers LLP as Nanometrics' independent registered public accounting firm for its fiscal year ending December 28, 2019.  NOTE: All directors are up for election and, if elected, will each serve for a term of one year or until his/her respective successor has been duly elected and qualified.  Directions to the annual meeting may be found on Nanometrics' website by clicking on “Contact” then “Map & Local Driving Directions.”  E72955-P20180