other advanced manufacturing markets and fluctuations in sales to MKS' and Atotech's existing and prospective customers; the challenges, risks and costs involved with integrating the operations of the companies MKS and Atotech acquire; the impact of the COVID-19 pandemic and related private and public measures on Atotech's business; the ability of MKS to anticipate and meet customer demand; manufacturing and sourcing risks, including supply chain disruptions and component shortages; potential fluctuations in quarterly results; dependence on new product development; rapid technological and market change; acquisition strategy; volatility of stock price; international operations; financial risk management; and the other factors described in MKS' Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and any subsequent Quarterly Reports on Form 10-Q, and Atotech's Annual Report on Form 20-F for fiscal year ended December 31, 2020 and any Reports on Form 6-K, each as filed with the U.S. Securities and Exchange Commission (the "SEC"). MKS and Atotech are under no obligation to, and expressly disclaim any obligation to, update or alter these forward-looking statements, whether as a result of new information, future events or otherwise after the date of this press release.

Additional Information and Where to Find It

BEFORE MAKING ANY VOTING DECISION, ATOTECH'S SHAREHOLDERS ARE URGED TO READ THE SCHEME DOCUMENT IN ITS ENTIRETY AND ANY OTHER DOCUMENTS FILED BY ATOTECH WITH THE SEC IN CONNECTION WITH THE PROPOSED TRANSACTION OR INCORPORATED BY REFERENCE THEREIN BEFORE MAKING ANY VOTING OR INVESTMENT DECISION WITH RESPECT TO THE PROPOSED TRANSACTION BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION AND THE PARTIES TO THE PROPOSED TRANSACTION.

Any vote in respect of resolutions to be proposed at Atotech shareholder meetings to approve the proposed transaction, the scheme of arrangement or related matters, or other responses in relation to the proposed transaction, should be made only on the basis of the information contained in the Scheme Document. Shareholders may obtain a free copy of the Scheme Document and other documents Atotech files with the SEC (when available) through the website maintained by the SEC at www.sec.gov. Atotech will also make available free of charge on its investor relations website at https://investors.atotech.com copies of materials it files with, or furnishes to, the SEC.

No Offer or Solicitation

This communication is for information purposes only and is not intended to and does not constitute, or form part of, an offer, invitation or the solicitation of an offer or invitation to purchase, otherwise acquire, subscribe for, sell or otherwise dispose of any securities, or the solicitation of any vote or approval in any jurisdiction, pursuant to the proposed transaction or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law.

The proposed transaction will be implemented solely pursuant to the scheme of arrangement, subject to the terms and conditions of the definitive agreement between MKS and Atotech, dated July 1, 2021, which contains the terms and conditions of the proposed transaction.

Appendix

All dates and times are based on Atotech's and MKS' current expectations and are subject to change. If any of the dates and/or times in this expected timetable change materially, the revised dates and/or times will be published by public announcement in the United States and by making such announcement available on Atotech's website https://www.globenewswire.com/Tracker?data=mKevPYz5DtDdvRmj2XOD2rS-eutr5k8LOegu4RzZ5lzs9aVYe_cpaR3uamChctthoWquIeY_WXjt40z4eJM0Zs6tOfjGOIZ8ETO1DNH7wdhISzSPrUS_PoIoBk-MmFNo https://investors.atotech.com. 


 
                              Event                                         Expected time / date 
----------------------------------------------------------------  --------------------------------------- 
  Directions Hearing                                              August 26, 2021 
 
  Non-Registered Shareholder Record Time                            5.00 p.m. (Eastern time) / 10.00 p.m. 
                                                                      (London time) on September 24, 2021 
 
  Publication of this Document                                                         September 28, 2021 
 
  Latest time for lodging Forms of Proxy for: 
 
  Court Meeting (BLUE form)                                         10.00 a.m. (Eastern Time) / 2.00 p.m. 
                                                                     (London Time) on November 1, 2021(1) 
 
  General Meeting (WHITE form)                                      10.15 a.m. (Eastern Time) / 2.15 p.m. 
                                                                     (London Time) on November 1, 2021(1) 
 
  Scheme Voting Record Time for the Court Meeting and               5.00 p.m. (Eastern Time) / 10.00 p.m. 
   the General Meeting                                               (London Time) on October 24, 2021(2) 
 
  Court Meeting                                                     10.00 a.m. (Eastern Time) / 2.00 p.m. 
                                                                        (London Time) on November 3, 2021 
 
  General Meeting                                                   10.15 a.m. (Eastern Time) / 2.15 p.m. 
                                                                     (London Time) on November 3, 2021(3) 
 
  The following dates are indicative only and will depend 
   on, among other things, the dates upon which (i) the 
   Conditions are satisfied or (where applicable) waived, 
   (ii) the Court sanctions the Scheme, and (iii) the 
   Court Order sanctioning the Scheme is delivered to 
   the Registrar of Companies. Atotech will give notice 
   of any changes to these dates and times, when known, 
   by public announcement in the United States and by 
   making such announcement available on Atotech's website 
   at https://investors.atotech.com https://investors.atotech.com. 
   Any further updates or changes to these times will 
   be notified in the same way. 
 
  Court Sanction Hearing                                               Subject to clause 9 of the Scheme, 
                                                                                        December 22, 2021 
 
  Last day of dealings in, and for registration of transfers                            D-3 Business Days 
   of, Atotech Shares 
 
  Scheme Record Time                                                5.00 p.m. (Eastern Time) / 10.00 p.m. 
                                                                        (London Time) on D-1 Business Day 
 
  Effective Date of the Scheme                                                   December 30, 2021 "D"(4) 
 
  Date for despatch of cheques/settlement for cash consideration                                     D(5) 
   (including any cash entitlement in respect of fractional 
   shares) due under the Scheme 
 
  Cancellation of listing of Atotech Shares on the NYSE           by 9.30 a.m. (Eastern Time) / 2.30 p.m. 
                                                                        (London Time) on D+1 Business Day 
 
  Listing of, and commencement of dealings in, New MKS            by 9.30 a.m. (Eastern Time) / 2.30 p.m. 
   Shares on Nasdaq                                                  (London Time) on D+1 Business Day(6) 
 
  New MKS Shares credited by the Transfer Agent to Cede                               D+1 Business Day(6) 
   & Co., as nominee for DTC (in respect of Atotech Shares 
   held in book-entry form through DTC) 
 
  New MKS Shares credited by the Transfer Agent in book-entry                         D+1 Business Day(6) 
   form on its books or through DRS if the Scheme Shareholder 
   is DRS-eligible (in respect of Atotech Shares held 
   in certificated or book-entry form on books of the 
   Transfer Agent) 
 
  Dispatch of statements of entitlement to New MKS Shares                             D+1 Business Day(6) 
   held through DRS (in respect of Atotech Shares held 
   in certificated or book-entry form on books of the 
   Transfer Agent) 
 
  Long Stop Date                                                                     December 31, 2021(7) 
  _________ 
   (1) The BLUE Form of Proxy must be received no later 
   than 10.00 a.m. (Eastern Time) / 2.00 p.m. (London 
   Time) on November 1, 2021 (or, if the Court Meeting 
   is adjourned, 48 hours (excluding any part of a day 
   that is not a Business Day) before the time fixed 
   for the adjourned Meeting). The WHITE Form of Proxy 
   must be received no later than 10.15 a.m. (Eastern 
   Time) / 2.15 p.m. (London Time) on November 1, 2021 
   (or, if the General Meeting is adjourned, 48 hours 
   (excluding any part of a day that is not a Business 
   Day) before the time fixed for the adjourned Meeting). 
   If the BLUE Form of Proxy relating to the Court Meeting 
   is not returned by Scheme Shareholders so as to be 
   received by the time mentioned above for return of 
   the BLUE Form of Proxy, it may be handed to the Chair 
   of the Court Meeting before the start of the Court 
   Meeting and will still be valid. In order to effect 
   this, it may be handed to the Chair in person at the 
   Court Meeting or emailed at any time prior to the 
   Court Meeting but NOT AFTER 10.00 a.m. (Eastern Time) 
   / 2.00 p.m. (London Time) on November 3, 2021 to Atotech@ogier.com. 
   (2) If either the Court Meeting or the General Meeting 
   is adjourned for more than 30 days, the Scheme Voting 
   Record Time for the relevant adjourned Meeting will 
   be 5.00 p.m. (Eastern Time) on the day which is 10 
   days before the date set for such adjourned Meeting. 
   (3) To commence at 10.15 a.m. (Eastern Time) / 2.15 
   p.m. (London Time) or, if later, as soon thereafter 
   as the Court Meeting shall have concluded or adjourned. 
   (4) The Scheme will become effective pursuant to its

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