UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No.    )

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Filed by a Party other than the Registrant  ☐

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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 under §240.14a-12

ARRAY TECHNOLOGIES, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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☐ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

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Array Technologies Inc Online Before the Annual Meeting. Go to www.investorvote.com/ARRY or scan the QR code — login details are located in the shaded bar below. During the Annual Meeting. Go to www.meetingcenter.io/212046685. Have the number that is printed in the shaded bar below available and follow the instructions on the reverse side. Stockholder Meeting Notice Important Notice Regarding the Availability of Proxy Materials for the Array Technologies, Inc. Stockholder Meeting to be Held on June 7, 2021. Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual stockholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! 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. The proxy statement and annual report to stockholders are available at: www.investorvote.com/ARRY Easy Online Access — View your proxy materials and vote. Step 1: Go to www.investorvote.com/ARRY. Step 2: Click on the icon on the right to view meeting materials. Step 3: Return to the investorvote.com window and follow the instructions on the screen to log in. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May 28, 2021 to facilitate timely delivery.

Stockholder Meeting Notice The 2021 Annual Meeting of Stockholders of ARRAY TECHNOLOGIES, INC. will be held on Monday, June 7, 2021 at 10:00 a.m. Pacific Time, virtually via the internet at www.meetingcenter.io/212046685. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. The password for this meeting is — ARRY2021. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommend a vote FOR all the nominees listed and FOR Proposal 2: 1. Elect the two persons named in this proxy statement as directors for terms of three years: 01—Troy Alstead 02—Orlando D. Ashford 2. Ratification of the appointment of BDO USA, LLP as our independent registered accounting firm for 2021. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Notice of Annual Meeting of Stockholders, Proxy Statement, Form of Electronic Proxy Card, Annual Report on Form 10-K, and any amendments thereto required to be furnished to stockholders are available at www.investorvote.com/ARRY and https://ir.arraytechinc.com/financial-information/sec-filings. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Here’s how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. — Internet – Go to www.investorvote.com/ARRY. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to investorvote@computershare.com with “Proxy Materials Array Technologies Inc.” in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, requests for a paper copy of proxy materials must be received by May 28, 2021.