UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

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☐    Definitive Proxy Statement

☒    Definitive Additional Materials

☐    Soliciting Material Pursuant to §240.14a-12

GITLAB INC.

(Name of Registrant as Specified In Its Charter)

N/A

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

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Your Vote Counts! GITLAB INC. 2023 Annual Meeting Vote by June 28, 2023 11:59 PM ET You invested in GITLAB 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 29, 2023. Vote Virtually at the Meeting* June 29, 2023 9:00 AM PDT Virtually at: www.virtualshareholdermeeting.com/GTLB2023 *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V14603-P89359 Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 15, 2023. 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. GITLAB INC. C/O: LEGAL DEPARTMENT 268 BUSH STREET #350 SAN FRANCISCO, CA 94104-3503 V1.2

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. Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. Voting Items Board Recommends V14604-P89359 NOTE: Such other business as may properly come before the meeting or any adjournment thereof. If no direction is made, this proxy will be voted “FOR ALL” for Proposal 1, “FOR” Proposal 2, “FOR” Proposal 3 and “1 YEAR” for Proposal 4. For All For For 1 Year 01) Karen Blasing 02) Merline Saintil 03) Godfrey Sullivan 1. Elect three Class II directors of GitLab Inc., each to serve a three-year term expiring at the 2026 Annual Meeting of Stockholders and until such director‘s successor is duly elected and qualified. Nominees: 2. Ratify the appointment of KPMG LLP as GitLab Inc.’s independent registered public accounting firm for the fiscal year ending January 31, 2024. 3. Approve, on a non-binding advisory basis, the compensation paid by GitLab Inc. to its named executive officers. 4. Approve, on a non-binding advisory basis, whether future advisory votes on the compensation paid by GitLab Inc. to its named executive officers should be held every one, two, or three years.