SEC Form DEFA14A filed by Generac Holdlings Inc.

Step 1: Go to www.envisionreports.com/GNRC. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. www.envisionreports.com/GNRC Online Go to www.envisionreports.com/GNRC or scan the QR code — login details are located in the shaded bar below. Stockholder Meeting Notice 049P6B Important Notice Regarding the Availability of Proxy Materials for the Generac Holdings Inc. Annual Stockholders’ Meeting to be Held on June 11, 2026 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 2026 Proxy Statement and 2025 Annual Report to stockholders are available at: 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 June 1, 2026 to facilitate timely delivery. 2NOT Easy Online Access — View your proxy materials and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. Votes submitted electronically must be received by 12:00am CT, on June 11, 2026. MMMMMMMMMMMM MMMMMMMMM 000001MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 ENDORSEMENT_LINE______________ SACKPACK_____________ 1234 5678 9012 345 C 1234567890 COY MMMMMMM

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.envisionreports.com/GNRC. Click Cast Your Vote or Request Materials. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to investorvote@computershare.com with “Proxy Materials Generac Holdings 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, all requests for a paper copy of proxy materials must be received by June 1, 2026. The Annual Meeting of Stockholders of Generac Holdings Inc. will be held at 9:00am CT, on June 11, 2026 at Generac corporate headquarters, S45 W29290 Highway 59, Waukesha, Wisconsin 53189. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends a vote FOR all nominees listed in Proposal 1 and FOR Proposals 2 and 3: 1. Election of Class II Directors: Marcia J. Avedon, Bennett J. Morgan, and Dominick P. Zarcone. 2. Proposal to ratify the selection of Deloitte & Touche LLP as our independent registered public accounting firm for the year ended December 31, 2026. 3. Advisory vote on the non-binding “say-on-pay” resolution to approve the compensation of our executive officers. 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. If you wish to attend and vote at the meeting, please bring this notice with you. Stockholder Meeting Notice Directions to the Annual Meeting of Stockholders of Generac Holdings Inc. Directions to the Annual Meeting of Stockholders of Generac Holdings Inc. can be found under the Contact Us section of our website at www.generac.com.