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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Check the appropriate box:

☐ 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 §240.14a-12

SEAWORLD ENTERTAINMENT, 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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☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i) (1) and 0-11.

SEAWORLD ENTERTAINMENT Logo SEAWORLD ENTERTAINMENT, INC. 6240 SEA HARBOR DRIVE ORLANDO, FL 32821 Your Vote Counts! SEAWORLD ENTERTAINMENT, INC. 2021 Annual Meeting Vote by June 10, 2021 11 :59 PM ET You invested in SEAWORLD ENTERTAINMENT, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 11, 2021. Get informed before you vote View the Proxy Statement, Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 27, 2021. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* June 11, 2021 11:00 AM EDT Virtually at: www.virtualshareholdermeeting.com/SEAS2021 *Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items 1. To firm for 2021. For 3. Approval, in a non-binding advisory vote, of the compensation paid to the named executive officers. For Board Recommends NOTE: To consider such other business as may properly come before the Annual Meeting and any adjournments or postponements thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Sign up for E-delivery".