Form DEFA14A Noble Corp plc

March 16, 2026 3:41 PM

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

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

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 under § 240.14a-12

Noble Corporation plc

(Name of Registrant as Specified in its Charter)

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

Payment of Filing Fee (Check all boxes that apply):

☒	No fee required

☐	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

Your Vote Counts! *Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V85353-P46185 NOBLE CORPORATION PLC 2101 CITYWEST BOULEVARD, SUITE 600 HOUSTON, TX 77042 NOBLE CORPORATION PLC 2026 Annual General Meeting Vote by April 27, 2026 11:59 PM ET You invested in NOBLE CORPORATION PLC and it’s time to vote! You have the right to vote on proposals being presented at the Annual General Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on April 29, 2026. 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 April 15, 2026. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to [email protected]. 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. Vote in Person at the Meeting* April 29, 2026 11:30 AM CT Noble Corporation plc 2101 CityWest Boulevard, Suite 600 Houston, TX 77042 USA

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V85354-P46185 Election or re-Election of the seven director nominees listed in the accompanying Proxy Statement by separate ordinary resolutions. For 1. Erik Bergöö 2. Patrice Douglas For 3. Robert W. Eifler For 4. Claus V. Hemmingsen For 5. Alan J. Hirshberg For 6. H. Keith Jennings For 7. Charles M. Sledge For 8. Ratification of Appointment of PricewaterhouseCoopers LLP (US) as Independent Registered Public Accounting Firm for Fiscal Year 2026. For 9. Re-appointment of PricewaterhouseCoopers LLP (UK) as UK Statutory Auditor. For 10. Authorization of Audit Committee to Determine UK Statutory Auditors’ Compensation. For 11. Approval by Advisory Vote of the Company’s Executive Compensation. For 12. Approval by Advisory Vote of the Directors’ Remuneration Report. For 13. Approval of the Directors’ Remuneration Policy. For 14. Authorization of the Board to Allot Shares. For 15. Authorization of the Board to Allot Shares without Rights of Pre-Emption. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Voting Items Board Recommends

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Form DEFA14A Noble Corp plc

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