Company: NE-WTA
Filing Date: 2025-04-22
Form Type: DEFA14A
Source: 0001628280-25-018699
Chunk: 0

Company: Noble Corp plc
Filing Date: 2025-04-22
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
<div align='center'>Washington, D.C. 20549

_____________________

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

_____________________</div>

Filed by the Registrant x

Filed by a Party other than the Registrant o

Check the appropriate box:

| o |     | Preliminary Proxy Statement                                                     |
| o |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| o |     | Definitive Proxy Statement                                                      |
| x |     | Definitive Additional Materials                                                 |
| o |     | Soliciting Material under § 240.14a-12                                          |

<div align='center'>Noble Corporation plc

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

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

| x |     | No fee required                                                                                     |
| o |     | Fee paid previously with preliminary materials                                                      |
| o |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

#### Noble Corporation plc

#### 2101 CityWest Boulevard

#### Suite 600, Houston, Texas 77042

### SUPPLEMENT TO PROXY STATEMENT
<div align='center'>RELATED TO 2025 ANNUAL GENERAL MEETING OF SHAREHOLDERS</div>

#### TO BE HELD ON MAY 8, 2025
This proxy statement supplement, dated April 22, 2025 (this “Supplement”), amends and supplements the definitive proxy statement on Schedule 14A (the “Proxy Statement”) filed by Noble Corporation plc (the “Company”) with the Securities and Exchange Commission (the “SEC”) on March 27, 2025 and made available to the Company’s shareholders in connection with the Company’s 2025 Annual General Meeting of Shareholders (the “ Meeting ”) to be held on May 8, 2025, at 9:00 a.m., Central Time, at NobleAdvances Training & Collaboration Facility, 12550 Reed Rd STE 200, Sugar Land, Texas, 77478. This Supplement is being filed with the SEC and made available