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                             March 30, 2023

       Gregory Graves
       Chief Financial Officer
       ENTEGRIS INC
       129 Concord Road
       Billerica, Massachusetts 01821

                                                        Re: ENTEGRIS INC
                                                            Form 10-K for the
Year Ended December 31, 2022
                                                            Form 8-K Filed
February 14, 2023
                                                            File No. 001-32598

       Dear Gregory Graves:

              We have limited our review of your filing to the financial
statements and related
       disclosures and have the following comments. In some of our comments, we
may ask you to
       provide us with information so we may better understand your disclosure.

              Please respond to these comments within ten business days by
providing the requested
       information or advise us as soon as possible when you will respond. If
you do not believe our
       comments apply to your facts and circumstances, please tell us why in
your response.

                                                        After reviewing your
response to these comments, we may have additional comments.

       Form 10-K for the Year Ended December 31, 2022

       Note 20. Segment Information, page F-34

   1.                                                   With reference to your
page 6 disclosures of the different products sold by your segments,
                                                        please tell us what
consideration was given to the guidance in ASC 280-10-50-40 in
                                                        determining that your
current disclosures provide adequate information regarding your
                                                        products and services.
       Form 8-K Filed February 14, 2023

       Exhibit 99.1, page 10

   2.                                                   In your determination
of Adjusted EBITDA, you include adjustments for integration costs
                                                        as well as contractual
and non-cash integration costs. You also include an adjustment for
                                                        integration costs in
your determination of non-GAAP net income. Please tell us the nature
                                                        of these costs. Provide
a breakdown of the types of costs included in these adjustments
 Gregory Graves
ENTEGRIS INC
March 30, 2023
Page 2
         and describe and quantify each material component. With reference to
the material
         components, please tell us what consideration you gave to Question
100.01 of the Non-
         GAAP Financial Measures Compliance & Disclosure Interpretations, as
updated
         December 13, 2022, in determining it was appropriate to include these
adjustments.

3.       You present proforma non-GAAP Net sales. Tell us and disclose if these
pro forma
         metrics were prepared in accordance with Article 11 of Regulation S-X.
If such
         information has not been prepared in accordance with Article 11,
please revise to disclose
         the basis for presentation and revise the description of the measures
accordingly. Refer to
         Question 100.05 of the Non-GAAP Measures Compliance and Disclosure
Interpretations
         as updated December 13, 2022. Ensure that you appropriately label each
metric
         accordingly. Pursuant to Item 10(e)(1)(i) of Regulation S-K, please
also disclose
         the reasons why management believes that presentation of this non-GAAP
financial
         measure provides useful information to investors as well as any
additional purposes for
         which management uses the non-GAAP financial measure.
        In closing, we remind you that the company and its management are
responsible for the
accuracy and adequacy of their disclosures, notwithstanding any review,
comments, action or
absence of action by the staff. You may contact Nudrat Salik at (202) 551-3692
or Jeanne Baker
at (202) 551-3691 with any questions.



                                                              Sincerely,
FirstName LastNameGregory Graves
                                                              Division of
Corporation Finance
Comapany NameENTEGRIS INC
                                                              Office of
Industrial Applications and
March 30, 2023 Page 2                                         Services
FirstName LastName