Business Combination Prospectus (Form 425)

Filed by NCS Multistage Holdings, Inc.

(Commission File No. 001-38071)

Pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: NCS Multistage Holdings, Inc.

(Commission File No. 001-38071)

The following email was sent to employees of NCS Multistage Holdings, Inc. on June 1, 2026:

Frequently Asked Questions

1. What was announced?

2. Why Weatherford?

3. What does this mean for employees?

4. Will this affect my role, responsibilities, or reporting relationships?

5. Should we expect layoffs?

6. What happens to salaries, benefits, and compensation?

7. What happens to the NCS stock that I own?

8. Who will lead the combined company? Where will the NCS business reside within Weatherford?

9. What about Repeat Precision and ResMetrics?

10. Should I reach out to my counterparts at Weatherford? What if a Weatherford customer contacts me?

11. Can I discuss the transaction on social media?

12. What do I tell customers, suppliers, or partners who ask about the transaction?

13. What if someone outside of NCS contacts me about the transaction?

14. Who do I contact if I have additional questions?

Appendix A

Employee Matters Under the Merger Agreement

This Appendix A provides a general summary of compensation and benefits addressed in the merger agreement.

Pay and benefits. Weatherford has agreed to provide eligible employees for the first 12 months after closing:

Bonus for the year in which the deal closes. The pre-closing portion of the year is paid based on actual performance, and the post-closing portion follows Weatherford's bonus program. Payment is made when Weatherford pays its comparable employees and to continuing employees who remain employed thorough such payment date or whose employment was terminated by Weatherford without cause before the payment date. If the deal closes after a year ends but before that year's bonuses are paid, the prior year's bonus, based on actual results, will be paid within about two weeks of closing.

Service credit and health plan transition. Prior service with NCS counts under Weatherford's plans for eligibility, vesting, and vacation/PTO accrual. In the year of closing, on Weatherford's comparable health plans, employees receive credit for deductibles, copays, and out-of-pocket amounts already paid during the year toward the corresponding amounts under the Weatherford plan.

This summary is intended to provide general personnel compensation and benefits information and does not modify or create any rights, contract or benefits. The benefits and provisions described above are governed entirely by the merger agreement, including any conditions and limitations set forth therein, which controls in the event of any discrepancy. Nothing in this summary is a guarantee of continued employment or of any particular pay, benefit, or other term.

Forward-Looking Statements

This communication includes statements, which, to the extent they are not statements of historical or present fact, constitute "forward-looking statements" within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements, and any related oral statements, can be identified by the use of terms such as "believe," "project," "expect," "anticipate," "estimate," "outlook," "budget," "intend," "strategy," "plan," "guidance," "may," "should," "could," "will," "would," "will be," "will continue," "will likely result," and similar expressions, although not all forward-looking statements contain these identifying words. These statements include, but are not limited to, statements about the expected timing and completion of the proposed transaction between Weatherford International plc ("Weatherford") and NCS Multistage Holdings, Inc. ("NCS Multistage"), the anticipated benefits of the

proposed transaction, and plans and expectations for the new combined company after the completion of the proposed transaction. Such statements are based upon the current beliefs of Weatherford's and NCS Multistage's management and are subject to significant risks, assumptions, and uncertainties. Should one or more of these risks or uncertainties materialize, or underlying assumptions prove incorrect, actual results may vary materially from those indicated in our forward-looking statements. Readers are cautioned that forward-looking statements are only estimates and may differ materially from actual future events or results, based on factors including but not limited to the ability to complete the proposed transaction on the timeframe or on the terms currently anticipated or at all, including due to a failure to obtain requisite regulatory approvals; risks related to difficulties, inabilities or delays in integrating the parties' businesses; the ability to realize the anticipated benefits of the proposed transaction, including estimated synergies; the occurrence of any event, change or other circumstance that could give rise to the right of either or both parties to terminate the Merger Agreement; the potential impact of the announcement or consummation of the proposed transaction on the parties' stock price and on their respective business, contractual and operational relationships; risks related to business disruptions from the proposed transaction that may harm the business or current plans and operations of either or both parties, including diversion of management time from ongoing business operations; the risk that the proposed transaction and its announcement could have an adverse effect on the ability of either or both parties to hire and retain key personnel; the outcome of any legal proceedings that may be instituted against Weatherford or NCS Multistage, or their respective directors; the possibility that the proposed transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events, or unforeseen or unknown liabilities; as well as the factors and risks described in Weatherford's Annual Report on Form 10-K for the year ended December 31, 2025 and NCS Multistage's Annual Report on Form 10-K for the year ended December 31, 2025, and, in each case, in subsequent filings with the U.S. Securities and Exchange Commission. Other unpredictable factors not discussed in this communication could also have material adverse effects on forward-looking statements. You should not place undue reliance on any of NCS Multistage's forward-looking statements.

Any forward-looking statement speaks only as of the date on which such statement is made, and NCS Multistage undertakes no obligation to correct or update any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by applicable law, and we caution you not to rely on them unduly.

No Offer or Solicitation

This communication is not intended to and shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended (the "Securities Act"), or in a transaction exempt from the registration requirements of the Securities Act.

Additional Information About the Transaction and Where to Find It

In connection with the proposed transaction, Weatherford intends to file a registration statement on Form S-4 (the "Form S-4") that also constitutes a prospectus of Weatherford with respect to the shares of Weatherford to be issued in the proposed transaction (the "prospectus") and NCS Multistage intends to file an information statement on Schedule 14C, with the Securities and Exchange Commission (the "SEC"). Each of Weatherford and NCS Multistage may also file other relevant documents with the SEC regarding the proposed transaction. This document is not a substitute for the Form S-4 or prospectus or any other document that Weatherford or NCS Multistage may file with the SEC. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT, THE INFORMATION STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT DOCUMENTS THAT MAY BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY IF AND WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security holders will be able to obtain free copies of the Form S-4 and the information statement/prospectus (if and when available) and other documents containing important information about Weatherford, NCS Multistage and the proposed transaction, once such documents are filed with the SEC through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with, or furnished to, the SEC by Weatherford will be available free of charge on Weatherford's website at https://weatherford.com/investor-relations/home. Copies of the documents filed with, or furnished to, the SEC by NCS Multistage will be available free of charge on NCS Multistage's website at https://ir.ncsmultistage.com. The information included on, or accessible through, Weatherford's or NCS Multistage's website is not incorporated by reference into this communication.