UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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DIODES INCORPORATED

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Diodes Incorporated to Hold Annual Meeting of Stockholders on

May 22, 2018

Plano, Texas – April 6, 2018 – Diodes Incorporated (NASDAQ: DIOD), a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets, today announced that it will hold its Annual Meeting of Stockholders on Tuesday, May 22, 2018 starting at 10:00 a.m. (Central Time). The Annual Meeting of Stockholders will be conducted at Diodes’ corporate headquarters, located at 4949 Hedgcoxe Road, Plano, Texas 75024. Diodes’ President and Chief Executive Officer, Dr. Keh-Shew Lu, and Chief Financial Officer, Richard D. White, will chair the meeting and provide a brief presentation.

In accordance with the United States Securities and Exchange Commission’s Notice and Access rule, on April 6, 2018, Diodes made available the “Notice of Internet Availability of Proxy Materials” to its stockholders based on a record date of March 23, 2018 and furnished proxy materials via the Internet. Diodes will provide a printed set of proxy materials by mail to any stockholder upon request. Stockholders may obtain printed copies of Diodes’ proxy materials free of charge by following the instructions provided on its website at http://investor.diodes.com under “Proxy Materials & Annual Reports.”

About Diodes Incorporated

Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor’s SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, analog, and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets. Diodes’ products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic devices, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching, and linear voltage regulators, and voltage references, along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. Diodes’ corporate headquarters and Americas’ sales office are located in Plano, Texas and Milpitas, California. Design, marketing, and engineering centers are located in Plano; Milpitas; Taipei, Taiwan; Taoyuan City, Taiwan; Zhubei City, Taiwan; Manchester, England; and Neuhaus, Germany. Diodes’ wafer fabrication facilities are located in Manchester and Shanghai, China. Diodes has assembly and test facilities located in Neuhaus, Shanghai, Jinan, Chengdu, and Yangzhou, China. Additional engineering, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Manchester; Shanghai; Shenzhen, China; Seongnam-si, South Korea; and Munich, Germany, with support offices throughout the world.

Recent news releases, annual reports and SEC filings are available at the Company’s website: http://www.diodes.com. Written requests may be sent directly to the Company, or they may be e-mailed to: diodes-fin@diodes.com.

Company Contact:	Investor Relations Contact:
Diodes Incorporated	Shelton Group
Laura Mehrl	Leanne Sievers
Director of Investor Relations	EVP, Investor Relations
P: 972-987-3959	P: 949-224-3874
E: laura_mehrl@diodes.com	E: lsievers@sheltongroup.com

DIODES INCORPORATED ANNUAL MEETING TO BE HELD ON 05/22/18 AT 10:00 A.M. CDT FOR HOLDERS AS OF 03/23/18    * ISSUER CONFIRMATION COPY—INFO ONLY * 10 1-0001 254543101 DIRECTORS THIS FORM IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. PLEASE DO NOT USE IT FOR VOTING PURPOSES. DIRECTORS RECOMMEND: A VOTE FOR ELECTION OF THE FOLLOWING NOMINEES 0010100 1.—01-C.H. Chen, 02- Michael R. Giordano,03-Keh-Shew Lu,04-Raymond Soong, 05-PeterM. Menard,06-Christina Wen-chi Sung,07-Michael K.C. Tsai PROPOSAL(S) DIRECTORS RECOMMEND 2. *- To approve, on an advisory basis, the Company’s executive compensation. FOR —»> 0019900 3. *- To ratify the appointment of Moss Adams LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31,2018. FOR —»> 0010200 *NOTE* Such other business as may properly come before the meeting or any adjournment thereof. *NOTE* In order to have your shares voted, your instructions must be received no later than May 21,2018 at 11:59 P.M. CDT. HOUSEHOLDING ELECTION —» Mark “FOR” to enroll this account to receive certain future shareholder communications in a single package per household. Mark “AGAINST” if you do not want to participate. To change your election in the future, call 1-866-540-7095. See accompanying page for more information about this election. (HH) VIF11H FOLD AND DETACH HERE < IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE SHAREHOLDER MEETING TO BE HELD ON 05/22/18 FOR DIODES INCORPORATED THE FOLLOWING MATERIAL IS AVAILABLE AT WWW.PROXYVOTE.COM** I **—ANNUAL REPORT- PROXY STATEMENT 2 -I -S DIRECTORS (MARK “X” FOR ONLY ONE BOX) FOR ALL NOMINEES WITHHOLD ALL NOMINEES WITHHOLD AUTHORITY TO VOTE FOR ANY INDIVIDUAL NOMINEE. WRITE NUMBER(S) OF NOMINEE(S) BELOW. USENUMBERONLY ABS â–¡ PLEASE INDICATE YOUR PROPOSAL SELECTION BY FIRMLY PLACING AN “X” IN THE APPROPRIATE NUMBERED BOX WITH BLUE OR BLACK INK PAGE SEE VOTING INSTRUCTION NO. 3 ON REVERSE A/C: FOR AGN ABS 254543101 0 0 0 -n — PLACE “X” HERE IF YOU PLAN TO ATTEND AND VOTE YOUR SHARES AT THE MEETING Broadridge 51 MERCEDES WAY EDGEWOOD NY 11717 Cd O u. o â–¡ â–¡ 1 OF 2 P01543 000 sO IMPORTANT NOTICE REGARDING DELIVERY OF SECURITY HOLDER DOCUMENTS (HH) DIODES INCORPORATED ATTN: ACCOUNTS PAYABLE 4949 HEDGCOXE ROAD, SUITE 200 PLANO, TEXAS 75024 FOLD AND DETACH HERE SIGNATURE(S) DATE

11 1-0001 P01543 DIRECTORS PLEASE RETAIN FOR YOUR RECORDS PROPOSAL(S) DIRECTORS RECOMMEND IIOL SEIIOLDING ELECTION This notice is appearing in this mailing on behalf of your Broker or Bank. In December 2000, the Securities and Exchange Commission enacted a new rule that allows multiple shareowners residing at the same address the convenience of receiving a single copy of proxy and information statements, annual reports and prospectuses if they consent to do so. This is known as “Householding.” Please note that if you do not respond. Householding will start 60 days after the mailing of this notice. We will allow Householding only upon certain conditions. Some of those conditions are: •    The Issuer agrees to have its documents Householded, • You agree to or do not object to the Householding of your materials, • You have the same last name and exact address as another sliareowner(s), • Consistency with your Broker or Bank’s practices. If all of these conditions are met. and Securities and Exchange Commission regulations allow, your household will receive a single copy of proxy’ and information statements, annual reports and prospectuses. The HOUSEHOLDING ELECTION (HH), which appears on the accompanying voting form, is not an issuer proposal. If you wish to participate in Householding please indicate “FOR1’ on the enclosed Voting Instruction Form and Householding will begin immediately. If you do not wish to participate in the Householding of investor communications, please indicate “AGAINST”. Your affirmative or implied consent to Household will remain in effect until you revoke it by calling the telephone number listed in the HOUSEHOLDING ELECTION paragraph. If you revoke your Householding election, each primary’ account holder will begin receiving individual copies within 30 days of your revocation. VIFHHD FOLD AND DETACH HERE < IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE SHAREHOLDER MEETING TO BE HELD ON 05/22/18 FOR DIODES INCORPORATED THE FOLLOWING MATERIAL IS AVAILABLE AT WWW.PROXYVOTE.COM ** I **—ANNUAL REPORT - PROXY STATEMENT DIRECTORS (MARK “X” FOR ONLY ONE BOX) USE NUMBER ONLY FOR AGAINST ABSTAIN DO NOT USE DO NOT USE DO NOT USE FOR AGAINST ABSTAIN DO NOT USE DO NOT USE DO NOT USE FOR AGAINST ABSTAIN DO NOT USE DO NOT USE DO NOT USE FOR AGAINST ABSTAIN DO NOT USE DO NOT USE DO NOT USE FOR AGAINST ABSTAIN DO NOT USE DO NOT USE DO NOT USE PAGE 2 OF 2

PLEASE INDICATE YOUR PROPOSAL SELECTION BY FIRMLY PLACING AN “X” IN THE APPROPRIATE NUMBERED BOX WITH BLUE OR BLACK INK    X SEE VOTING INSTRUCTION NO. _ A/C: 254543101 ON REVERSE WRONG WAY P.O. BOX 9175 P01543 XXXXXXXXXX FOLD AND DETACH HERE Broadridge 51 MERCEDES WAY EDGEWOOD NY 11717 IMPORTANT NOTICE REGARDING DELIVERY OF SECURITY HOLDER DOCUMENTS (HH) DIODES INCORPORATED ATTN: ACCOUNTS PAYABLE 4949 HEDGCOXE ROAD, SUITE 200 PLANO, TEXAS 75024 SIGNATURE(S) DATE r Proxy Services P.O. Box 9175 Fanning dale NY 11735-9852 Please ensure you fold then detach and retain this portion of the Voting Instruction Form L 1 VOTING INSTRUCTIONS TO OUR CLIENTS: WE HAVE BEEN REQUESTED TO FORWARD TO YOU THE ENCLOSED PROXY MATERIAL RELATIVE TO SECURITIES HELD BY US IN YOUR ACCOUNT BUT NOT REGISTERED IN YOUR NAME. ONLY WE AS THE HOLDER OF RECORD CAN VOTE SUCH SECURITIES. WE SHALL BE PLEASED TO VOTE YOUR SECURITIES IN ACCORDANCE WITH YOUR WISHES, IF YOU WILL EXECUTE THE FORM AND RETURN IT TO US PROMPTLY IN THE ENCLOSED BUSINESS REPLY ENVELOPE. IT IS UNDERSTOOD THAT IF YOU SIGN WITHOUT OTHERWISE MARKING THE FORM YOUR SECURITIES WILL BE VOTED AS RECOMMENDED BY THE BOARD OF DIRECTORS ON ALL MATTERS TO BE CONSIDERED AT THE MEETING. FOR THIS MEETING, THE EXTENT OF OUR AUTHORITY TO VOTE YOUR SECURITIES IN THE ABSENCE OF YOUR INSTRUCTIONS CAN BE DETERMINED BY REFERRING TO THE APPLICABLE VOTING INSTRUCTION NUMBER INDICATED ON THE FACE OF YOUR FORM. FOR MARGIN ACCOUNTS, IN THE EVENT YOUR SECURITIES HAVE BEEN LOANED OVER RECORD DATE, THE NUMBER OF SECURITIES WE VOTE ON YOUR BEHALF HAS BEEN OR CAN BE ADJUSTED DOWNWARD. PLEASE NOTE THAT UNDER A RULE AMENDMENT ADOPTED BY THE NEW YORK STOCK EXCHANGE FOR SHAREHOLDER MEETINGS HELD ON OR AFTER JANUARY 1, 2010, BROKERS ARE NO LONGER ALLOWED TO VOTE SECURITIES HELD IN THEIR CLIENTS’ACCOUNTS ON UNCONTESTED ELECTIONS OF DIRECTORS UNLESS THE CLIENT HAS PROVIDED VOTING INSTRUCTIONS (IT WILL CONTINUE TO BE THE CASE THAT BROKERS CANNOT VOTE THEIR CLIENTS’ SECURITIES IN CONTESTED DIRECTOR ELECTIONS). CONSEQUENTLY, IF YOU WANT US TO VOTE YOUR SECURITIES ON YOUR BEHALF ON THE ELECTION OF DIRECTORS, YOU MUST PROVIDE VOTING INSTRUCTIONS TO US. VOTING ON MATTERS PRESENTED AT SHAREHOLDER MEETINGS, PARTICULARLY THE ELECTION OF DIRECTORS IS THE PRIMARY METHOD FOR SHAREHOLDERS TO INFLUENCE THE DIRECTION TAKEN BY A PUBLICLY-TRADED COMPANY. WE URGE YOU TO PARTICIPATE IN THE ELECTION BY RETURNING THE ENCLOSED VOTING INSTRUCTION FORM TO US WITH INSTRUCTIONS AS TO HOWTO VOTE YOUR SECURITIES IN THIS ELECTION. IF YOUR SECURITIES ARE HELD BY A BROKER WHO ISA MEMBER OF THE NEW YORK STOCK EXCHANGE (NYSE), THE RULES OF THE NYSE WILL GUIDE THE VOTING PROCEDURES. THESE RULES PROVIDE THAT IF INSTRUCTIONS ARE NOT RECEIVED FROM YOU PRIOR TO THE ISSUANCE OF THE FIRST VOTE, THE PROXY MAY BE GIVEN AT DISCRETION OF YOUR BROKER (ON THE TENTH DAY, IF THE MATERIAL WAS MAILED AT LEAST 15 DAYS PRIOR TO THE MEETING DATE OR ON THE FIFTEENTH DAY, IF THE PROXY MATERIAL WAS MAILED 25 DAYS OR MORE PRIOR TO THE MEETING DATE). IN ORDER FOR YOUR BROKER TO EXERCISE THIS DISCRETIONARY AUTHORITY, PROXY MATERIAL WOULD NEED TO HAVE BEEN MAILED AT LEAST 15 DAYS PRIOR TO THE MEETING DATE, AND ONE OR MORE OF THE MATTERS BEFORE THE MEETING MUST BE DEEMED “ROUTINE” IN NATURE ACCORDING TO NYSE GUIDELINES. IF THESE TWO REQUIREMENTS ARE MET AND YOU HAVE NOT COMMUNICATED TO US PRIOR TO THE FIRST VOTE BEING ISSUED, WE MAY VOTE YOUR SECURITIES AT OUR DISCRETION ON ANY MATTERS DEEMED TO BE ROUTINE. WE WILL NEVERTHELESS FOLLOW YOUR INSTRUCTIONS, EVEN IF OUR DISCRETIONARY VOTE HAS ALREADY BEEN GIVEN, PROVIDED YOUR INSTRUCTIONS ARE RECEIVED PRIOR TO THE MEETING DATE. THE FOLLOWING INSTRUCTIONS PROVIDE SPECIFICS REGARDING THE MEETING FOR WHICH THIS VOTING FORM APPLIES. INSTRUCTION 1 ALL PROPOSALS FOR THIS MEETING ARE CONSIDERED “ROUTINE”. WE WILL VOTE IN OUR DISCRETION ON ALL PROPOSALS, IF YOUR INSTRUCTIONS ARE NOT RECEIVED. IF YOUR SECURITIES ARE HELD BY A BANK, YOUR SECURITIES CANNOT BE VOTED WITHOUT YOUR SPECIFIC INSTRUCTIONS. INSTRUCTION 2 IN ORDER FOR YOUR SECURITIES TO BE REPRESENTED AT THE MEETING ON ONE OR MORE MATTERS BEFORE THE MEETING, IT WILL BE NECESSARY FOR US TO HAVE YOUR SPECIFIC VOTING INSTRUCTIONS. IF YOUR SECURITIES ARE HELD BY A BANK, YOUR SECURITIES CANNOT BE VOTED WITHOUT YOUR SPECIFIC INSTRUCTIONS. INSTRUCTION 3 IN ORDER FOR YOUR SECURITIES TO BE REPRESENTED AT THE MEETING, IT WILL BE NECESSARY FOR US TO HAVE YOUR SPECIFIC VOTING INSTRUCTIONS. INSTRUCTION 4 WE HAVE PREVIOUSLY SENT YOU PROXY SOLICITING MATERIAL PERTAINING TO THE MEETING OF SHAREHOLDERS OF THE COMPANY INDICATED. ACCORDING TO OUR LATEST RECORDS, WE HAVE NOT AS OF YET RECEIVED YOUR VOTING INSTRUCTION ON THE MATTERS(S) TO BE CONSIDERED AT THIS MEETING AND THE COMPANY HAS REQUESTED US TO COMMUNICATE WITH YOU IN AN ENDEAVOR TO HAVE YOUR SECURITIES VOTED. **IF YOU HOLD YOUR SECURITIES THROUGH A CANADIAN BROKER OR BANK, PLEASE BE ADVISED THAT YOU ARE RECEIVING THE VOTING INSTRUCTION FORM AND MEETING MATERIALS, AT THE DIRECTION OF THE ISSUER. EVEN IF YOU HAVE DECLINED TO RECEIVE SECURITY- HOLDER MATERIALS, A REPORTING ISSUER IS REQUIRED TO DELIVER THESE MATERIALS TO YOU. IF YOU HAVE ADVISED YOUR INTERMEDIARY THAT YOU OBJECT TO THE DISCLOSURE OF YOUR BENEFICIAL OWNERSHIP INFORMATION TO THE REPORTING ISSUER, IT IS OUR RESPONSIBILITY TO DELIVER THESE MATERIALS TO YOU ON BEHALF OF THE REPORTING ISSUER. THESE MATERIALS ARE BEING SENT AT NO COST TO YOU. J

*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on <mtgdate>. May 22, 2018 Meeting Information DIODES INCORPORATED Meeting Type: Annual <mtgtype> Meeting For holders as of: March <recdate> 23, 2018 Date: May 22, 2018 Time: 10:00 <mtgtime> AM CDT Location: 4949 Hedgcoxe Road, Plano, Texas 75024 BROKER LOGO HERE You are receiving this communication because you hold Return Address Line 1 shares in the above named company. Return Address Line 2 Return Address Line 3 51 MERCEDES WAY This is not a ballot. You cannot use this notice to vote EDGEWOOD NY 11717 these shares. This communication presents only an Investor Address Line 1 overview of the more complete proxy materials that are Investor Address Line 2 1 available to you on the Internet. You may view the proxy Investor Address Line 3 materials online at www.proxyvote.com or easily request a Investor Address Line 4 15 12 OF paper copy (see reverse side). Investor Address Line 5 John Sample 2 We encourage you to access and review all of the important 1234 ANYWHERE STREET information contained in the proxy materials before voting. ANY CITY, ON A1A 1A1 See the reverse side of this notice to obtain proxy materials and voting instructions. 0000373379_1 R1.0.1.17 B A R C O D E Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence #

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. Annual Report 2. Notice & Proxy Statement 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. 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 08, 2018 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder 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. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box Internal Use marked by the arrow ï§ available and follow the instructions. Only Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a voting instruction form. 0000373379_2 R1.0.1.17

Voting items The Board of Directors recommends that you vote FOR the following: 1. Election of Directors Nominees 01 C.H. Chen 02 Michael R. Giordano 03 Keh-Shew Lu 04 Raymond Soong 05 Peter M. Menard 06 Christina Wen-chi Sung 07 Michael K.C. Tsai The Board of Directors recommends you vote FOR the following proposal(s): 2 Approval of Executive Compensation. To approve, on an advisory basis, the Company’s executive compensation. 3 Ratification of Appointment of Independent Registered Public Accounting Firm. To ratify the appointment of Moss Adams LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2018. NOTE: To transact such other business as properly may come before the Meeting or any adjournment or postponement thereof. For address changes and/or comments, please check this box and write them on the back where indicated. B A R C O D E 0000373379_3 R1.0.1.17 Broadridge Internal Use Only xxxxxxxxxx xxxxxxxxxx Cusip Job # Envelope # Sequence # # of # Sequence #

Reserved for Broadridge Internal Control Information Voting Instructions THIS SPACE RESERVED FOR LANGUAGE PERTAINING TO BANKS AND BROKERS AS REQUIRED BY THE NEW YORK STOCK EXCHANGE THIS SPACE RESERVED FOR SIGNATURES IF APPLICABLE 0000373379_4 R1.0.1.17 Broadridge Internal Use Only P99999-010 12 Job # Envelope # Sequence 15 # # of # Sequence # OF##