SCHEDULE 14A INFORMATION

(RULE 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12

AMERICAN VANGUARD CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

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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 June 6, 2017. Meeting Information AMERICAN VANGUARD CORPORATION  Meeting Type: Annual Meeting For holders as of: April 11, 2017 Date: June 6, 2017 Time: 11:00 AM PDT Location: Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/AVD2017. The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/AVD2017 and be sure to have the information that is printed in the box marked by the arrow (located on the following page).XXXX XXXX XXXX XXXX AMERICAN VANGUARD CORPORATION ATTN: LUCY COONEY 4695 MACARTHUR COURT, SUITE 1200 NEWPORT BEACH, CA 92660 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. You may view the proxy materials online at www.proxyvote.com 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. E27844-P91145 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 FORM 10-K How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. 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, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. XXXX XXXX XXXX XXXX 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 23, 2017 to facilitate timely delivery. How To Vote E27845-P91145 Please Choose One of the Following Voting Methods Vote By Internet: Before The Meeting: Go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions. During The Meeting: Go to www.virtualshareholdermeeting.com/AVD2017. Have the information that is printed in the box marked 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. XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX

Voting Items The Board of Directors recommends you vote FOR the following: The Board of Directors recommends you vote FOR proposals 2, 3 and 5 and recommends "EACH YEAR" for proposal 4. 1. Election of Directors Nominees: 2. Ratify the appointment of BDO USA, LLP as independent registered public accounting firm for the year ending December 31, 2017. 1a. Scott D. Baskin 1b. Lawrence S. Clark 3. Give an advisory vote to approve the compensation paid to the Company's named executive officers as disclosed pursuant to Item 402 of Regulation S-K. 1c. Debra F. Edwards 1d. Morton D. Erlich 4. Give an advisory vote on executive compensation as a ballot measure in future proxy materials annually. 1e. Alfred F. Ingulli 5. Approve the Company's Amended and Restated 1994 Stock Incentive Plan as set forth in Appendix A to the Proxy. 1f. John L. Killmer 1g. Eric G. Wintemute 1h. M. Esmail Zirakparvar E27846-P91145

E27847-P91145

TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDSDETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. Signature (Joint Owners) Date Date Signature [PLEASE SIGN WITHIN BOX] VOTE BY INTERNET Before The Meeting - Go to www.proxyvote.com Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 P.M. Eastern Time the day before the meeting date. Have your notice of meeting in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting instruction form. During The Meeting - Go to www.virtualshareholdermeeting.com/AVD2017 You may attend the Meeting via the Internet and vote during the Meeting. Have the information that is printed in the box marked by the arrow available and follow the instructions. VOTE BY PHONE - 1-800-690-6903 Use any touch-tone telephone to transmit your voting instructions up until 11:59 P.M. Eastern Time the day before the meeting date. Have your proxy card in hand when you call and then follow the instructions. VOTE BY MAIL Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717. AMERICAN VANGUARD CORPORATION ATTN: LUCY COONEY 4695 MACARTHUR COURT, SUITE 1200 NEWPORT BEACH, CA 92660 E27837-P91145 AMERICAN VANGUARD CORPORATION The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees: AGAINST FOR ABSTAIN The Board of Directors recommends you vote FOR proposals 2, 3 and 5 and recommends "EACH YEAR" for proposal 4. 1a. Scott D. Baskin AGAINST FORABSTAIN 2. Ratify the appointment of BDO USA, LLP as independent registered public accounting firm for the year ending December 31, 2017. 1b. Lawrence S. Clark 1c. Debra F. Edwards 3. Give an advisory vote to approve the compensation paid to the Company's named executive officers as disclosed pursuant to Item 402 of Regulation S-K. 1d. Morton D. Erlich EVERY 2 YEARS EVERY 3 YEARS EACH YEAR 1e. Alfred F. Ingulli ABSTAIN 4. Give an advisory vote on executive compensation as a ballot measure in future proxy materials annually. 1f. John L. Killmer 1g. Eric G. Wintemute FOR AGAINST ABSTAIN 5. Approve the Company's Amended and Restated 1994 Stock Incentive Plan as set forth in Appendix A to the Proxy. 1h. M. Esmail Zirakparvar Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. V.1.2

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Notice and Proxy Statement and Form 10-K are available at www.proxyvote.com. E27838-P91145 AMERICAN VANGUARD CORPORATION 4695 MacArthur Court, Suite 1200, Newport Beach, California 92660 THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS As an alternative to completing this form, you may enter your vote instruction via the Internet at www.proxyvote.com or by telephone at 1-800-690-6903. Use the Company Number and Account Number shown on your proxy. The undersigned hereby appoints ERIC G. WINTEMUTE and TIMOTHY J. DONNELLY as Proxies, each with the power to appoint his substitute, and authorizes them to represent and to vote as designated on the reverse, all the shares of the Common Stock of American Vanguard Corporation held of record by the undersigned at the close of business on April 11, 2017. The Annual Meeting will be a completely virtual meeting of Stockholders, to be held at 11:00 a.m. PDT on Tuesday, June 6, 2017, or at any adjournment thereof. Continued and to be signed on reverse side V.1.2