Exhibit 99.1

PRECISION DRILLING CORPORATION

NOTICE OF CHANGE OF AUDITOR

Pursuant to NI 51-102 (Section 4.11)

Notice is hereby given, pursuant to section 4.11 of National Instrument 51-102 – Continuous Disclosure Obligations (“NI 51-102”), of a change of auditor of Precision Drilling Corporation (the “Corporation”) from KPMG LLP (“KPMG”) to PricewaterhouseCoopers LLP (“PwC”).

On October 22, 2025, following completion of a tender process, the Board of Directors of the Corporation, upon recommendation of the Audit Committee of the Board of Directors, approved the appointment of PwC as auditor to fill the vacancy that will be created by KPMG’s resignation as the Corporation’s auditor, at the request of the Corporation, from the effective date of KPMG’s resignation until the next annual meeting of shareholders of the Corporation. On October 23, 2025, KPMG notified the Corporation that, at the request of the Corporation, it will resign as auditor of the Corporation effective as of the day immediately following the date of KPMG’s report in respect of its audit of the Corporation’s consolidated financial statements for the year ended December 31, 2025. KPMG will continue to act as the Corporation’s auditor until the effective date of its resignation. There were no modifications of opinion by KPMG in KPMG’s reports on the Corporation’s financial statements for the two most recently completed fiscal years ended December 31, 2024 and 2023.

There have been no reportable events, including disagreements, consultations or unresolved issues, as defined in Section 4.11 of NI 51-102, in connection with the audits of the two most recent fiscal years and with any subsequent period to date.

DATED this 23rd day of October, 2025.

Exhibit 99.2

October 23, 2025

To:

Alberta Securities Commission

British Columbia Securities Commission

Financial and Consumer Affairs Authority of Saskatchewan

Manitoba Securities Commission

Ontario Securities Commission

Autorité des marchés financiers (Québec)

Financial and Consumer Services Commission (New Brunswick)

Nova Scotia Securities Commission

Office of the Superintendent of Securities Service Newfoundland and Labrador

Financial and Consumer Services Division (Prince Edward Island)

Office of the Superintendent of Securities (Northwest Territories)

Office of the Yukon Superintendent of Securities

Office of the Superintendent of Securities Nunavut

We have read the statements made by Precision Drilling Corporation in the attached copy of change of auditor notice dated October 23, 2025, which we understand will be filed pursuant to Section 4.11 of National Instrument 51-102.

We agree with the statements concerning PricewaterhouseCoopers LLP in the change of auditor notice dated October 23, 2025.

Yours very truly,

/s/PricewaterhouseCoopers LLP

Chartered Professional Accountants

PricewaterhouseCoopers LLP

111-5th Avenue SW, Suite 3100, Calgary, Alberta, Canada T2P 5L3

T: +1 403 509 7500, F: +1 403 781 1825, www.pwc.com/ca

“PwC” refers to PricewaterhouseCoopers LLP, an Ontario limited liability partnership.

Exhibit 99.3

KPMG LLP

3100-205 5th Avenue SW Calgary AB T2P 4B9 Canada

Tel 403 691 8000

Fax 403 691 8008

October 23, 2025

Re: Notice of Change of Auditors of Precision Drilling Corporation

We have read the Notice of Precision Drilling Corporation dated October 23, 2025, and are in agreement with the statements contained in such Notice.

Yours very truly,

Chartered Professional Accountants