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    <div style="text-align: center; font-weight: bold;">As filed with the U.S. Securities and Exchange Commission on May 2, 2024</div>
    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: right; font-weight: bold;">Registration No. 333-</div>
    <div style="text-align: center;">
      <hr align="center" style="border: none; border-bottom: 1px solid black; border-top: 4px solid black; height: 10px; color: #ffffff; background-color: #ffffff; margin-left: auto; margin-right: auto;"></div>
    <div style="text-align: center; font-size: 14pt; font-weight: bold;">UNITED STATES</div>
    <div style="text-align: center; font-size: 14pt; font-weight: bold;">SECURITIES AND EXCHANGE COMMISSION</div>
    <div style="text-align: center; font-size: 12pt; font-weight: bold;">Washington, D.C. 20549</div>
    <div style="text-align: center;"><font style="font-size: 12pt;"> </font><br>
    </div>
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    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: center; font-size: 18pt; font-weight: bold;">FORM S-8</div>
    <div style="text-align: center; font-weight: bold;">REGISTRATION STATEMENT</div>
    <div style="text-align: center; font-style: italic; font-weight: bold;">UNDER</div>
    <div style="text-align: center; font-style: italic; font-weight: bold;">THE SECURITIES ACT OF 1933</div>
    <div style="text-align: center;"> <br>
    </div>
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    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: center; font-size: 24pt; font-weight: bold;">ENTEGRIS, INC.</div>
    <div style="text-align: center; font-weight: bold;">(Exact name of registrant as specified in its charter)</div>
    <div style="text-align: center;"> <br>
    </div>
    <div>
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    <br>
    <table cellspacing="0" cellpadding="0" border="0" id="z42e403e9b71b4c299782d959c61e2e57" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;">

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            <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">Delaware</div>
          </td>
          <td style="width: 2%; vertical-align: top;" colspan="1">&#160;</td>
          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">41-1941551</div>
          </td>
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          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: #000000; font-weight: bold;">(State or other jurisdiction of</div>
            <div style="text-align: center; color: #000000; font-weight: bold;">incorporation or organization)</div>
          </td>
          <td style="width: 2%; vertical-align: top;" colspan="1">&#160;</td>
          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: #000000; font-weight: bold;">(I.R.S. Employer</div>
            <div style="text-align: center; color: #000000; font-weight: bold;">Identification No.)</div>
          </td>
        </tr>
        <tr>
          <td style="width: 49%; vertical-align: top;">&#160;</td>
          <td style="width: 2%; vertical-align: top;" colspan="1">&#160;</td>
          <td style="width: 49%; vertical-align: top;">&#160;</td>
        </tr>
        <tr>
          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">129 Concord Road, Billerica, MA</div>
          </td>
          <td style="width: 2%; vertical-align: top;" colspan="1">&#160;</td>
          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">01821</div>
          </td>
        </tr>
        <tr>
          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">(Address of Principal Executive Offices)</div>
          </td>
          <td style="width: 2%; vertical-align: top;" colspan="1">&#160;</td>
          <td style="width: 49%; vertical-align: top;">
            <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">(Zip Code)</div>
          </td>
        </tr>

    </table>
    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: center; font-weight: bold;">Entegris, Inc. 2024 Employee Stock Purchase Plan</div>
    <div style="text-align: center; font-weight: bold;">&#160;(Full title of the plan)</div>
    <div style="text-align: center;"> <br>
    </div>
    <div>
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    </div>
    <div style="text-align: center; font-weight: bold;">Joseph Colella, Esq.</div>
    <div style="text-align: center; font-weight: bold;">Senior Vice President, General Counsel, Chief Compliance Officer, and Secretary</div>
    <div style="text-align: center; font-weight: bold;">Entegris, Inc.</div>
    <div style="text-align: center; font-weight: bold;">129 Concord Road</div>
    <div style="text-align: center; font-weight: bold;">Billerica, MA 01821</div>
    <div style="text-align: center; font-weight: bold;">(978) 436-6500</div>
    <div style="text-align: center; font-weight: bold;">(Name, address and telephone number, including area code, of agent for service)</div>
    <div style="text-align: center;"> <br>
    </div>
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    <div>Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated
      filer,&#8221; &#8220;smaller reporting company&#8221; and &#8220;emerging growth company&#8221; in Rule 12b-2 of the Exchange Act.</div>
    <div> <br>
    </div>
    <table cellspacing="0" cellpadding="0" border="0" id="z07f00f12218e40be9911b61b20dc8dc3" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;">

        <tr>
          <td style="width: 45%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">Large accelerated filer</div>
          </td>
          <td style="width: 5%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">&#9746;</div>
          </td>
          <td style="width: 45%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">Accelerated filer</div>
          </td>
          <td style="width: 5%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">&#9744;</div>
          </td>
        </tr>
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          <td style="width: 45%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">Non-accelerated filer</div>
          </td>
          <td style="width: 5%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">&#9744;</div>
          </td>
          <td style="width: 45%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">Smaller reporting company</div>
          </td>
          <td style="width: 5%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">&#9744;</div>
          </td>
        </tr>
        <tr>
          <td style="width: 45%; vertical-align: bottom;">&#160;</td>
          <td style="width: 5%; vertical-align: bottom;">&#160;</td>
          <td style="width: 45%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">Emerging growth company</div>
          </td>
          <td style="width: 5%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">&#9744;</div>
          </td>
        </tr>

    </table>
    <div style="margin-left: 0.25pt;"> <br>
    </div>
    <div style="margin-left: 0.25pt;">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to
      Section 7(a)(2)(B) of the Securities Act. &#9744;</div>
    <div><br>
    </div>
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    <div style="text-align: center; font-weight: bold;">EXPLANATORY NOTE</div>
    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">This Registration Statement on Form S-8 is filed by Entegris, Inc., a Delaware corporation (the &#8220;Registrant&#8221;), to register 2,598,676 shares of its common stock, par value $0.01 per share (the &#8220;Common
      Stock&#8221;), issuable in connection with the Entegris, Inc. 2024 Employee Stock Purchase Plan (the &#8220;Plan&#8221;) under the Securities Act of 1933, as amended (the &#8220;Securities Act&#8221;). The Plan was approved by the stockholders of the Registrant on April 24, 2024.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: center; font-weight: bold;">PART I</div>
    <div style="text-align: center; font-weight: bold;">Information Required in the Section 10(a) Prospectus</div>
    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">The information required by Part I is included in the documents sent or given to participants in the Plan pursuant to Rule 428(b)(1) of the Securities Act. Such documents are not required to be, and
      are not, filed with the Securities and Exchange Commission (the &#8220;SEC&#8221;) either as part of this Registration Statement or as a prospectus or prospectus supplement pursuant to Rule 424 under the Securities Act. These documents and the documents
      incorporated by reference in this Registration Statement pursuant to Item 3 of Part II of Form S-8, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.</div>
    <div><br>
    </div>
    <div style="text-align: center; font-weight: bold;">PART II</div>
    <div style="text-align: center; font-weight: bold;">INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</div>
    <div style="text-align: justify;"> <br>
      <div>
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              <td style="text-align: right; vertical-align: top; width: 36pt;">
                <div style="text-align: justify; color: rgb(0, 0, 0); font-weight: bold;">Item 3.</div>
              </td>
              <td style="text-align: left; vertical-align: top; width: auto;">
                <div style="text-align: justify; color: rgb(0, 0, 0); font-weight: bold;">Incorporation of Documents by Reference.</div>
              </td>
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  <div><br>
    <div style="text-align: justify; text-indent: 36pt;">The following documents filed with the SEC are hereby incorporated by reference and shall be deemed to be a part of this Registration Statement:</div>
    <div><br>
    </div>
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            <div style="text-align: justify; color: rgb(0, 0, 0);">(a)</div>
          </td>
          <td style="width: 96.16%; vertical-align: top;">
            <div style="text-align: justify;"><font style="color: #000000;">the Registrant&#8217;s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (No. 001-32598), as filed with the SEC on</font>&#160;<a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/0001101302/000110130224000009/entg-20231231.htm">February 15, 2024</a><font style="color: rgb(0, 0, 0);"> (including the information specifically incorporated by reference from the
                Registrant&#8217;s Schedule 14A proxy statement for its 2024 annual meeting of stockholders, as filed with the SEC on </font><a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/0001101302/000110130224000022/entg-20240318.htm">March 18, 2024</a><font style="color: rgb(0, 0, 0);"> and as supplemented on </font><a href="https://www.sec.gov/Archives/edgar/data/1101302/000114036124015044/ef20025060_defa14a.htm">March 25, 2024</a><font style="color: rgb(0, 0, 0);">);</font></div>
          </td>
        </tr>
        <tr>
          <td style="width: 3.84%; vertical-align: top;">
            <div style="text-align: justify; color: rgb(0, 0, 0);">(b)</div>
          </td>
          <td style="width: 96.16%; vertical-align: top;">
            <div style="text-align: justify; color: rgb(0, 0, 0);">the Registrant&#8217;s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2024 (No. 001-32598), as filed with the SEC on <a href="https://www.sec.gov/Archives/edgar/data/0001101302/000110130224000040/entg-20240330.htm">May 1, 2024</a>;</div>
          </td>
        </tr>
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          <td style="width: 3.84%; vertical-align: top;">
            <div style="text-align: justify; color: rgb(0, 0, 0);">(c)</div>
          </td>
          <td style="width: 96.16%; vertical-align: top;">
            <div style="text-align: justify;"><font style="color: #000000;">the Registrant&#8217;s Current Reports on Form 8-K (No. 001-32598), as filed with the SEC on </font><a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/1101302/000110130224000002/entg-20240117.htm">January 17, 2024</a><font style="color: #000000;">; </font><a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/0001101302/000110130224000012/entg-20240307.htm">March 7, 2024</a><font style="color: #000000;">, </font><a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/0001101302/000114036124016112/ef20025430_8k.htm">March 28, 2024</a><font style="color: #000000;">, </font><a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/1101302/000110130224000027/entg-20240417.htm">April 17, 2024</a><font style="color: #000000;"> and </font><a href="https://www.sec.gov/ix?doc=/Archives/edgar/data/1101302/000110130224000029/entg-20240424.htm">April 24, 2024</a><font style="color: #000000;">;</font></div>
          </td>
        </tr>
        <tr>
          <td style="width: 3.84%; vertical-align: top;">
            <div style="text-align: justify; color: rgb(0, 0, 0);">(d)</div>
          </td>
          <td style="width: 96.16%; vertical-align: top;">
            <div style="text-align: justify;"><font style="color: #000000;">the description of the Registrant&#8217;s Common Stock contained in the Registrant&#8217;s registration statement on Form 8-A filed with the SEC on </font><a href="https://www.sec.gov/Archives/edgar/data/1101302/000104596900000486/0001045969-00-000486-0001.txt">June 30, 2000</a><font style="color: #000000;">, as updated by the description of the Registrant&#8217;s Common Stock contained in Exhibit 4.1
                to its Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (No. 001-32598) filed with the SEC on </font><a href="https://www.sec.gov/Archives/edgar/data/1101302/000110130220000013/entg-12312019xex41.htm">February 7, 2020</a><font style="color: #000000;">, and including any amendment or report filed for the purpose of updating such description; and</font></div>
          </td>
        </tr>
        <tr>
          <td style="width: 3.84%; vertical-align: top;">
            <div style="text-align: justify; color: rgb(0, 0, 0);">(e)</div>
          </td>
          <td style="width: 96.16%; vertical-align: top;">
            <div style="text-align: justify; color: rgb(0, 0, 0);">all documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as amended, after the date of this Registration Statement and
              prior to the filing of a post-effective amendment to this Registration Statement indicating that all securities offered have been sold or that deregisters all securities then remaining unsold, which will be deemed to be incorporated by
              reference into this Registration Statement and will be a part of this Registration Statement from the date such document is filed, except as to portions of any future Current Report on Form 8-K furnished under Items 2.02, 7.01, and 9.01 of
              Form 8-K that are deemed not to be filed under such provisions.</div>
          </td>
        </tr>

    </table>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for the purposes of this Registration Statement to the
      extent that a statement contained in this Registration Statement or in any other subsequently filed document that also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or
      superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
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            <td style="text-align: right; vertical-align: top; width: 36pt;">
              <div style="text-align: justify; font-weight: bold;">Item 4.</div>
            </td>
            <td style="text-align: left; vertical-align: top; width: auto;">
              <div style="text-align: justify; text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Description of Securities.</div>
            </td>
          </tr>

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    </div>
    <div style="text-align: justify;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;Not applicable.</div>
    <div><br>
    </div>
    <div>
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            <td style="text-align: right; vertical-align: top; width: 9pt;">
              <div style="text-align: justify; text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Item 5.</div>
            </td>
            <td style="text-align: left; vertical-align: top; width: auto;">
              <div style="text-align: justify; text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Interests of Named Experts and Counsel.</div>
            </td>
          </tr>

      </table>
    </div>
    <div style="text-align: justify;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;Not applicable.</div>
    <div><br>
    </div>
    <div>
      <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%;" id="z5ebf4244d70441288661e8662729c604" class="DSPFListTable">

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            <td style="text-align: right; vertical-align: top; width: 9pt;">
              <div style="text-align: justify; text-indent: -36pt; margin-left: 36pt;"><font style="font-weight: bold;">Item 6.</font></div>
            </td>
            <td style="text-align: left; vertical-align: top; width: auto;">
              <div style="text-align: justify; text-indent: -36pt; margin-left: 36pt;"><font style="font-weight: bold;">Indemnification of Officers and Directors.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="text-align: justify;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">The Registrant is incorporated under the laws of the State of Delaware. Section 145 (&#8220;Section 145&#8221;) of the General Corporation Law of the State of Delaware, as the same exists or may hereafter be
      amended (the &#8220;DGCL&#8221;), <font style="font-style: italic;">inter alia</font>, provides that a Delaware corporation may indemnify any persons who were, are or are threatened to be made parties to any threatened, pending or completed action, suit or
      proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person is or was an officer, director, employee or agent of such corporation, or is or
      was serving at the request of such corporation as a director, officer, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys&#8217; fees), judgments, fines and amounts paid in settlement actually
      and reasonably incurred by such person in connection with such action, suit or proceeding, provided that such person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the corporation&#8217;s best interests and,
      with respect to any criminal action or proceeding, had no reasonable cause to believe that his or her conduct was illegal.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;Section 145 further authorizes a corporation to purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the corporation, or is or was serving
      at the request of the corporation as a director, officer, employee or agent of another corporation or enterprise, against any liability asserted against him or her and incurred by him or her in any such capacity, arising out of his or her status as
      such, whether or not the corporation would otherwise have the power to indemnify him or her under Section 145.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;The Registrant&#8217;s certificate of incorporation provides that the Registrant&#8217;s directors shall not be liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as
      a director, except to the extent that the exculpation from liabilities is not permitted under the DGCL as in effect at the time such liability is determined. The Registrant&#8217;s certificate of incorporation provides that the corporation shall indemnify
      its directors to the full extent permitted by the laws of the State of Delaware. In addition, the Registrant&#8217;s bylaws provide for indemnification of the registrant&#8217;s officers and directors to the fullest extent permitted by applicable law.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;All of the Registrant&#8217;s directors and officers are covered by insurance policies maintained by the Registrant against specified liabilities for actions taken in their capacities as such, including
      liabilities under the Securities Act of 1933.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;The Registrant has entered into indemnification agreements with its directors and certain of its executive officers providing for the indemnification of such director or executive officer, as
      applicable, to the extent legally permissible and the payment of expenses, including counsel fees reasonably incurred in connection with the defense or disposition of any action, suit or other proceeding in which such individual may be involved by
      reason of such individual being or having been a director or officer of the Registrant.</div>
    <div>&#160;</div>
    <div>
      <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%;" id="z94152f85acf049d7be2bed77739e7f4e" class="DSPFListTable">

          <tr style="vertical-align: top;">
            <td style="text-align: right; vertical-align: top; width: 9pt;">
              <div style="text-align: left; text-indent: -36pt; margin-left: 36pt;"><font style="font-weight: bold;">Item 7.</font></div>
            </td>
            <td style="text-align: left; vertical-align: top; width: auto;">
              <div style="text-indent: -36pt; margin-left: 36pt;"><font style="font-weight: bold;">Exemption From Registration Claimed.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="text-align: justify;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">&#160;Not applicable.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div> </div>
    <div class="BRPFPageBreakArea" style="clear: both; margin-top: 10pt; margin-bottom: 10pt;">
      <div class="BRPFPageBreak" style="page-break-after: always;">
        <hr noshade="noshade" style="margin: 4px 0px; width: 100%; border-width: 0; height: 2px; color: #000000; background-color: #000000; clear: both;"></div>
    </div>
    <div>
      <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%;" class="DSPFListTable">

          <tr style="vertical-align: top;">
            <td style="text-align: right; vertical-align: top; width: 45pt;">
              <div style="text-align: left; text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Item 8.</div>
            </td>
            <td style="text-align: left; vertical-align: top; width: auto;">
              <div style="text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Exhibits.</div>
            </td>
          </tr>

      </table>
    </div>
    <div> <br>
    </div>
    <table cellspacing="0" cellpadding="0" border="0" id="z063fe6f0616d4a91aa590889a89263a5" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;">

        <tr>
          <td style="width: 7%; vertical-align: bottom;">
            <div style="text-align: center; color: #000000; font-weight: bold;">Exhibit</div>
            <div style="text-align: center; color: #000000; font-weight: bold;"><u>Number</u></div>
          </td>
          <td style="width: 1%; vertical-align: middle;">&#160;</td>
          <td style="width: 92.33%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0); font-weight: bold;"><u>Description</u></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: center;"><a href="https://www.sec.gov/Archives/edgar/data/1101302/000119312512078423/d270721dex31.htm">4.1</a></div>
          </td>
          <td style="width: 1%; vertical-align: top; background-color: rgb(204, 238, 255);">&#160;</td>
          <td style="width: 92.33%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: justify;"><a href="https://www.sec.gov/Archives/edgar/data/1101302/000119312512078423/d270721dex31.htm">Amended and Restated Certificate of Incorporation of Entegris, Inc., as amended (incorporated by reference to
                Exhibit 3.1 to the Registrant&#8217;s Annual Report on Form 10-K (No. 001-32598) for the fiscal year ended December 31, 2011, as filed with the SEC on February 24, 2012).</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top;">
            <div style="text-align: center;"><a href="https://www.sec.gov/Archives/edgar/data/1101302/000110130222000052/entegris-bylaws.htm">4.2</a></div>
          </td>
          <td style="width: 1%; vertical-align: top;">&#160;</td>
          <td style="width: 92.33%; vertical-align: top;">
            <div style="text-align: justify;"><a href="https://www.sec.gov/Archives/edgar/data/1101302/000110130222000052/entegris-bylaws.htm">By-Laws of Entegris, Inc., as amended December 8, 2022 (incorporated by reference to Exhibit 3.1 to the
                Registrant&#8217;s Current Report on Form 8-K (No. 001-32598), as filed with the SEC on December 9, 2022).</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: center;"><a href="ef20028157_ex5-1.htm">5.1</a></div>
          </td>
          <td style="width: 1%; vertical-align: top; background-color: rgb(204, 238, 255);">&#160;</td>
          <td style="width: 92.33%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: justify;"><a href="ef20028157_ex5-1.htm">Opinion of Baker &amp; McKenzie LLP*</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top;">
            <div style="text-align: center;"><a href="ef20028157_ex5-1.htm">23.1</a></div>
          </td>
          <td style="width: 1%; vertical-align: top;">&#160;</td>
          <td style="width: 92.33%; vertical-align: top;">
            <div style="text-align: justify;"><a href="ef20028157_ex5-1.htm">Consent of Baker &amp; McKenzie LLP (included in Exhibit 5.1).*</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: center;"><a href="ef20028157_ex23-2.htm">23.2</a></div>
          </td>
          <td style="width: 1%; vertical-align: top; background-color: rgb(204, 238, 255);">&#160;</td>
          <td style="width: 92.33%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: justify;"><a href="ef20028157_ex23-2.htm">Consent of KPMG LLP.*</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top;">
            <div style="text-align: center;"><a href="#POWEROFATTORNEY">24.1</a></div>
          </td>
          <td style="width: 1%; vertical-align: top;">&#160;</td>
          <td style="width: 92.33%; vertical-align: top;">
            <div style="text-align: justify;"><a href="#POWEROFATTORNEY">Power of Attorney (included on the signature page hereto).*</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: center;"><a href="https://www.sec.gov/Archives/edgar/data/1101302/000110130224000022/entg-20240318.htm#i1efc3c9fd6784e06b31577a43db406e0_1773">99.1</a></div>
          </td>
          <td style="width: 1%; vertical-align: top; background-color: rgb(204, 238, 255);">&#160;</td>
          <td style="width: 92.33%; vertical-align: top; background-color: rgb(204, 238, 255);">
            <div style="text-align: justify;"><a href="https://www.sec.gov/Archives/edgar/data/1101302/000110130224000022/entg-20240318.htm#i1efc3c9fd6784e06b31577a43db406e0_1773">Entegris, Inc. 2024 Employee Stock Purchase Plan (incorporated by reference
                to Appendix B to the Registrant&#8217;s Schedule 14A proxy statement for its 2024 annual meeting of stockholders (No. 001-32598), as filed with the SEC on March 18, 2024).</a></div>
          </td>
        </tr>
        <tr>
          <td style="width: 7%; vertical-align: top;">
            <div style="text-align: center;"><a href="ef20028157_ex107.htm">107</a></div>
          </td>
          <td style="width: 1%; vertical-align: top;">&#160;</td>
          <td style="width: 92.33%; vertical-align: top;">
            <div style="text-align: justify;"><a href="ef20028157_ex107.htm">Filing Fee Table.*</a></div>
          </td>
        </tr>

    </table>
    <div style="text-indent: 36pt;"> <br>
    </div>
    <div style="text-indent: 36pt;">*Filed herewith.</div>
    <div style="text-indent: 36pt;"> <br>
    </div>
    <div>
      <table cellspacing="0" cellpadding="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%;" id="z1ff49743db074cef9082df36f5270a11" class="DSPFListTable">

          <tr style="vertical-align: top;">
            <td style="text-align: right; vertical-align: top; width: 9pt;">
              <div style="text-align: left; text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Item 9.</div>
            </td>
            <td style="text-align: left; vertical-align: top; width: auto;">
              <div style="text-indent: -36pt; margin-left: 36pt; font-weight: bold;">Undertakings.</div>
            </td>
          </tr>

      </table>
    </div>
    <div> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">(a) The undersigned Registrant hereby undertakes:</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 36pt;">(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:</div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 72pt;">(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;</div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 72pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 72pt;">(ii) To reflect in the prospectus any facts or events arising after the effective date of this Registration Statement (or the most recent post-effective amendment thereof) which,
      individually or in the aggregate, represent a fundamental change in the information set forth in this Registration Statement;</div>
    <div><br>
    </div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 72pt;">(iii) To include any material information with respect to the plan of distribution not previously disclosed in this Registration Statement or any material change to such
      information in this Registration Statement;</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; margin-left: 72pt;">provided, however, that paragraphs (a) (1) (i) and (a) (1) (ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic
      reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in this Registration Statement.</div>
    <div style="text-align: justify;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 36pt;">(2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement
      relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.</div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt; margin-left: 36pt;">(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold&#160; at the termination of the offering.</div>
    <div style="text-align: justify;"> <br>
    </div>
    <div class="BRPFPageBreakArea" style="clear: both; margin-top: 10pt; margin-bottom: 10pt;">
      <div class="BRPFPageBreak" style="page-break-after: always;">
        <hr noshade="noshade" style="border-width: 0px; clear: both; margin: 4px 0px; width: 100%; height: 2px; color: #000000; background-color: #000000;"></div>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the Registrant&#8217;s annual report pursuant to Section
      13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is incorporated by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein and the offering of such
      securities at that time shall be deemed to be initial bona fide offering thereof.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the Registrant pursuant to the provisions
      referred to in Item 6 hereof, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore,
      unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a directors, officer or controlling person of the Registrant in the successful defense of
      any action, suit or proceeding) is asserted by such director, officer, or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling
      precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.</div>
    <div style="text-align: center;"><font style="color: #000000;"> </font><br>
    </div>
    <div class="BRPFPageBreakArea" style="clear: both; margin-top: 10pt; margin-bottom: 10pt;">
      <div class="BRPFPageBreak" style="page-break-after: always;">
        <hr noshade="noshade" style="margin: 4px 0px; width: 100%; border-width: 0; height: 2px; color: #000000; background-color: #000000; clear: both;"></div>
    </div>
    <div style="text-align: center; font-weight: bold;">SIGNATURES</div>
    <div style="text-align: center;"> <br>
    </div>
    <div style="text-align: justify; text-indent: 36pt;">Pursuant to the requirements of the Securities Act of 1933, as amended, Entegris, Inc. certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8
      and has duly caused this registration statement on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the Town of Billerica, Commonwealth of Massachusetts, on May 2, 2024.</div>
    <div style="text-align: justify; text-indent: 36pt;"> <br>
    </div>
    <table cellspacing="0" cellpadding="0" border="0" id="z60e363fbb505455f9a309bcf2d8673d9" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: #000000;">

        <tr>
          <td style="vertical-align: top;" colspan="2">
            <div style="color: rgb(0, 0, 0); font-weight: bold;">ENTEGRIS, INC.</div>
          </td>
        </tr>
        <tr>
          <td style="width: 5%; vertical-align: bottom;">&#160;</td>
          <td style="width: 95%; vertical-align: bottom;">&#160;</td>
        </tr>
        <tr>
          <td style="width: 5%; vertical-align: top;">
            <div style="color: rgb(0, 0, 0);">By</div>
          </td>
          <td style="width: 95%; vertical-align: bottom; border-bottom: 2px solid rgb(0, 0, 0);">
            <div style="color: rgb(0, 0, 0);">/s/ Bertrand Loy</div>
          </td>
        </tr>
        <tr>
          <td style="width: 5%; vertical-align: bottom;">&#160;</td>
          <td style="width: 95%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">Bertrand Loy</div>
          </td>
        </tr>
        <tr>
          <td style="width: 5%; vertical-align: bottom;">&#160;</td>
          <td style="width: 95%; vertical-align: bottom;">
            <div style="color: rgb(0, 0, 0);">President and Chief Executive Officer</div>
          </td>
        </tr>

    </table>
    <div style="text-align: center;"><font style="color: #000000;"> </font>
      <div style="text-align: right;"><font style="font-weight: bold;"><br>
        </font></div>
      <div class="BRPFPageBreakArea" style="clear: both; margin-top: 10pt; margin-bottom: 10pt;">
        <div class="BRPFPageBreak" style="page-break-after: always;">
          <hr noshade="noshade" style="border-width: 0px; clear: both; margin: 4px 0px; width: 100%; height: 2px; color: #000000; background-color: #000000;"></div>
      </div>
      <div>
        <div style="font-weight: bold;"><a name="POWEROFATTORNEY"><!--Anchor--></a>POWER OF ATTORNEY</div>
        <div>&#160;<br>
        </div>
        <div style="text-align: justify; text-indent: 36pt;">We, the undersigned officers and directors of Entegris, Inc., hereby severally constitute and appoint each of Bertrand Loy, Linda LaGorga and Joseph Colella our true and lawful attorneys-in-fact,
          with full power to them in any and all capacities, to sign any and all amendments to this Registration Statement on Form S-8 (including any post-effective amendments thereto), and to file the same, with exhibits thereto and other documents in
          connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact may do or cause to be done by virtue hereof.</div>
        <div style="text-align: justify; text-indent: 36pt;">&#160;<br>
        </div>
        <div style="text-align: justify; text-indent: 36pt;">Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and as of the dates indicated.</div>
        <div style="text-align: justify; text-indent: 36pt;">&#160;<br>
        </div>
        <table cellspacing="0" cellpadding="0" border="0" style="font-family: 'Times New Roman'; font-size: 10pt; width: 100%; border-collapse: collapse; text-align: left; color: rgb(0, 0, 0);">

            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">
                <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">Signature</div>
              </td>
              <td style="width: 49.02%; vertical-align: bottom;">
                <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">Title</div>
              </td>
              <td style="width: 19.24%; vertical-align: bottom;">
                <div style="text-align: center; color: rgb(0, 0, 0); font-weight: bold;">Date</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">&#160;</td>
              <td style="width: 49.02%; vertical-align: bottom;">&#160;</td>
              <td style="width: 19.24%; vertical-align: bottom;">&#160;</td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);">
                <div style="text-align: center; color: rgb(0, 0, 0);">/s/ Bertrand Loy</div>
              </td>
              <td style="width: 49.02%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: #000000;">President, Chief Executive Officer and Director</div>
                <div style="text-align: center; color: #000000;">(Principal executive officer)</div>
              </td>
              <td style="width: 19.24%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">May 2, 2024</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top;">
                <div style="text-align: center; color: rgb(0, 0, 0);">Bertrand Loy</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">&#160;</td>
              <td style="width: 49.02%; vertical-align: bottom;">&#160;</td>
              <td style="width: 19.24%; vertical-align: bottom;">&#160;</td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);">
                <div style="text-align: center; color: rgb(0, 0, 0);">/s/ Linda LaGorga</div>
              </td>
              <td style="width: 49.02%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: #000000;">Senior Vice President and Chief Financial Officer</div>
                <div style="text-align: center; color: #000000;">(Principal financial officer)</div>
              </td>
              <td style="width: 19.24%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">May 2, 2024</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top;">
                <div style="text-align: center; color: rgb(0, 0, 0);">Linda LaGorga</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">&#160;</td>
              <td style="width: 49.02%; vertical-align: bottom;">&#160;</td>
              <td style="width: 19.24%; vertical-align: bottom;">&#160;</td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);">
                <div style="text-align: center; color: rgb(0, 0, 0);">/s/ Michael D. Sauer</div>
              </td>
              <td style="width: 49.02%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: #000000;">Vice President, Controller and Chief Accounting Officer</div>
                <div style="text-align: center; color: #000000;">(Principal accounting officer)</div>
              </td>
              <td style="width: 19.24%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">May 2, 2024</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top;">
                <div style="text-align: center; color: rgb(0, 0, 0);">Michael D. Sauer</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">&#160;</td>
              <td style="width: 49.02%; vertical-align: bottom;">&#160;</td>
              <td style="width: 19.24%; vertical-align: bottom;">&#160;</td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);">
                <div style="text-align: center; color: rgb(0, 0, 0);">/s/ James R. Anderson</div>
              </td>
              <td style="width: 49.02%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">Director</div>
              </td>
              <td style="width: 19.24%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">May 2, 2024</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top;">
                <div style="text-align: center; color: rgb(0, 0, 0);">James R. Anderson</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">&#160;</td>
              <td style="width: 49.02%; vertical-align: bottom;">&#160;</td>
              <td style="width: 19.24%; vertical-align: bottom;">&#160;</td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);">
                <div style="text-align: center; color: rgb(0, 0, 0);">/s/ Rodney Clark</div>
              </td>
              <td style="width: 49.02%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">Director</div>
              </td>
              <td style="width: 19.24%; vertical-align: top;" rowspan="2">
                <div style="text-align: center; color: rgb(0, 0, 0);">May 2, 2024</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top;">
                <div style="text-align: center; color: rgb(0, 0, 0);">Rodney Clark</div>
              </td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: bottom;">&#160;</td>
              <td style="width: 49.02%; vertical-align: bottom;">&#160;</td>
              <td style="width: 19.24%; vertical-align: bottom;">&#160;</td>
            </tr>
            <tr>
              <td style="width: 31.74%; vertical-align: top; border-bottom: 2px solid rgb(0, 0, 0);">
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{"company-data": {"conformed-name": "ENTEGRIS INC", "cik": "0001101302", "assigned-sic": "3089", "organization-name": "08 Industrial Applications and Services", "irs-number": "411941551", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-279085", "film-number": "24909995"}, "business-address": {"street1": "129 CONCORD ROAD", "city": "BILLERICA", "state": "MA", "zip": "01821", "phone": "9784366500"}, "mail-address": {"street1": "129 CONCORD ROAD", "city": "BILLERICA", "state": "MA", "zip": "01821"}}
As filed with the U.S. Securities and Exchange Commission on May 2, 2024
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
ENTEGRIS, INC.
(Exact name of registrant as specified in its charter)
Delaware
41-1941551
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer
Identification No.)
129 Concord Road, Billerica, MA
01821
(Address of Principal Executive Offices)
(Zip Code)
Entegris, Inc. 2024 Employee Stock Purchase Plan
(Full title of the plan)
Joseph Colella, Esq.
Senior Vice President, General Counsel, Chief Compliance Officer, and Secretary
Entegris, Inc.
129 Concord Road
Billerica, MA 01821
(978) 436-6500
(Name, address and telephone number, including area code, of agent for service)
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated
      filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
☒
Accelerated filer
☐
Non-accelerated filer
☐
Smaller reporting company
☐
Emerging growth company
☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to
      Section 7(a)(2)(B) of the Securities Act. ☐
EXPLANATORY NOTE
This Registration Statement on Form S-8 is filed by Entegris, Inc., a Delaware corporation (the "Registrant"), to register 2,598,676 shares of its common stock, par value $0.01 per share (the "Common
      Stock"), issuable in connection with the Entegris, Inc. 2024 Employee Stock Purchase Plan (the "Plan") under the Securities Act of 1933, as amended (the "Securities Act"). The Plan was approved by the stockholders of the Registrant on April 24, 2024.
PART I
Information Required in the Section 10(a) Prospectus
The information required by Part I is included in the documents sent or given to participants in the Plan pursuant to Rule 428(b)(1) of the Securities Act. Such documents are not required to be, and
      are not, filed with the Securities and Exchange Commission (the "SEC") either as part of this Registration Statement or as a prospectus or prospectus supplement pursuant to Rule 424 under the Securities Act. These documents and the documents
      incorporated by reference in this Registration Statement pursuant to Item 3 of Part II of Form S-8, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3.
Incorporation of Documents by Reference.
The following documents filed with the SEC are hereby incorporated by reference and shall be deemed to be a part of this Registration Statement:
(a)
the Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (No. 001-32598), as filed with the SEC on
February 15, 2024
(including the information specifically incorporated by reference from the
                Registrant's Schedule 14A proxy statement for its 2024 annual meeting of stockholders, as filed with the SEC on
March 18, 2024
and as supplemented on
March 25, 2024
);
(b)
the Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2024 (No. 001-32598), as filed with the SEC on
May 1, 2024
;
(c)
the Registrant's Current Reports on Form 8-K (No. 001-32598), as filed with the SEC on
January 17, 2024
;
March 7, 2024
,
March 28, 2024
,
April 17, 2024
and
April 24, 2024
;
(d)
the description of the Registrant's Common Stock contained in the Registrant's registration statement on Form 8-A filed with the SEC on
June 30, 2000
, as updated by the description of the Registrant's Common Stock contained in Exhibit 4.1
                to its Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (No. 001-32598) filed with the SEC on
February 7, 2020
, and including any amendment or report filed for the purpose of updating such description; and
(e)
all documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as amended, after the date of this Registration Statement and
              prior to the filing of a post-effective amendment to this Registration Statement indicating that all securities offered have been sold or that deregisters all securities then remaining unsold, which will be deemed to be incorporated by
              reference into this Registration Statement and will be a part of this Registration Statement from the date such document is filed, except as to portions of any future Current Report on Form 8-K furnished under Items 2.02, 7.01, and 9.01 of
              Form 8-K that are deemed not to be filed under such provisions.
Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for the purposes of this Registration Statement to the
      extent that a statement contained in this Registration Statement or in any other subsequently filed document that also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or
      superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.
Item 4.
Description of Securities.
Not applicable.
Item 5.
Interests of Named Experts and Counsel.
Not applicable.
Item 6.
Indemnification of Officers and Directors.
The Registrant is incorporated under the laws of the State of Delaware. Section 145 ("Section 145") of the General Corporation Law of the State of Delaware, as the same exists or may hereafter be
      amended (the "DGCL"),
inter alia
, provides that a Delaware corporation may indemnify any persons who were, are or are threatened to be made parties to any threatened, pending or completed action, suit or
      proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person is or was an officer, director, employee or agent of such corporation, or is or
      was serving at the request of such corporation as a director, officer, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually
      and reasonably incurred by such person in connection with such action, suit or proceeding, provided that such person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the corporation's best interests and,
      with respect to any criminal action or proceeding, had no reasonable cause to believe that his or her conduct was illegal.
Section 145 further authorizes a corporation to purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the corporation, or is or was serving
      at the request of the corporation as a director, officer, employee or agent of another corporation or enterprise, against any liability asserted against him or her and incurred by him or her in any such capacity, arising out of his or her status as
      such, whether or not the corporation would otherwise have the power to indemnify him or her under Section 145.
The Registrant's certificate of incorporation provides that the Registrant's directors shall not be liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as
      a director, except to the extent that the exculpation from liabilities is not permitted under the DGCL as in effect at the time such liability is determined. The Registrant's certificate of incorporation provides that the corporation shall indemnify
      its directors to the full extent permitted by the laws of the State of Delaware. In addition, the Registrant's bylaws provide for indemnification of the registrant's officers and directors to the fullest extent permitted by applicable law.
All of the Registrant's directors and officers are covered by insurance policies maintained by the Registrant against specified liabilities for actions taken in their capacities as such, including
      liabilities under the Securities Act of 1933.
The Registrant has entered into indemnification agreements with its directors and certain of its executive officers providing for the indemnification of such director or executive officer, as
      applicable, to the extent legally permissible and the payment of expenses, including counsel fees reasonably incurred in connection with the defense or disposition of any action, suit or other proceeding in which such individual may be involved by
      reason of such individual being or having been a director or officer of the Registrant.
Item 7.
Exemption From Registration Claimed.
Not applicable.
Item 8.
Exhibits.
Exhibit
Number
Description
4.1
Amended and Restated Certificate of Incorporation of Entegris, Inc., as amended (incorporated by reference to
                Exhibit 3.1 to the Registrant's Annual Report on Form 10-K (No. 001-32598) for the fiscal year ended December 31, 2011, as filed with the SEC on February 24, 2012).
4.2
By-Laws of Entegris, Inc., as amended December 8, 2022 (incorporated by reference to Exhibit 3.1 to the
                Registrant's Current Report on Form 8-K (No. 001-32598), as filed with the SEC on December 9, 2022).
5.1
Opinion of Baker & McKenzie LLP*
23.1
Consent of Baker & McKenzie LLP (included in Exhibit 5.1).*
23.2
Consent of KPMG LLP.*
24.1
Power of Attorney (included on the signature page hereto).*
99.1
Entegris, Inc. 2024 Employee Stock Purchase Plan (incorporated by reference
                to Appendix B to the Registrant's Schedule 14A proxy statement for its 2024 annual meeting of stockholders (No. 001-32598), as filed with the SEC on March 18, 2024).
107
Filing Fee Table.*
*Filed herewith.
Item 9.
Undertakings.
(a) The undersigned Registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:
(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;
(ii) To reflect in the prospectus any facts or events arising after the effective date of this Registration Statement (or the most recent post-effective amendment thereof) which,
      individually or in the aggregate, represent a fundamental change in the information set forth in this Registration Statement;
(iii) To include any material information with respect to the plan of distribution not previously disclosed in this Registration Statement or any material change to such
      information in this Registration Statement;
provided, however, that paragraphs (a) (1) (i) and (a) (1) (ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic
      reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in this Registration Statement.
(2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement
      relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold  at the termination of the offering.
(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the Registrant's annual report pursuant to Section
      13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is incorporated by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein and the offering of such
      securities at that time shall be deemed to be initial bona fide offering thereof.
(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the Registrant pursuant to the provisions
      referred to in Item 6 hereof, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore,
      unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a directors, officer or controlling person of the Registrant in the successful defense of
      any action, suit or proceeding) is asserted by such director, officer, or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling
      precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended, Entegris, Inc. certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8
      and has duly caused this registration statement on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the Town of Billerica, Commonwealth of Massachusetts, on May 2, 2024.
ENTEGRIS, INC.
By
/s/ Bertrand Loy
Bertrand Loy
President and Chief Executive Officer
POWER OF ATTORNEY
We, the undersigned officers and directors of Entegris, Inc., hereby severally constitute and appoint each of Bertrand Loy, Linda LaGorga and Joseph Colella our true and lawful attorneys-in-fact,
          with full power to them in any and all capacities, to sign any and all amendments to this Registration Statement on Form S-8 (including any post-effective amendments thereto), and to file the same, with exhibits thereto and other documents in
          connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact may do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and as of the dates indicated.
Signature
Title
Date
/s/ Bertrand Loy
President, Chief Executive Officer and Director
(Principal executive officer)
May 2, 2024
Bertrand Loy
/s/ Linda LaGorga
Senior Vice President and Chief Financial Officer
(Principal financial officer)
May 2, 2024
Linda LaGorga
/s/ Michael D. Sauer
Vice President, Controller and Chief Accounting Officer
(Principal accounting officer)
May 2, 2024
Michael D. Sauer
/s/ James R. Anderson
Director
May 2, 2024
James R. Anderson
/s/ Rodney Clark
Director
May 2, 2024
Rodney Clark
/s/ James F. Gentilcore
Director
May 2, 2024
James F. Gentilcore
/s/ Yvette Kanouff
Director
May 2, 2024
Yvette Kanouff
/s/ James P. Lederer
Director
May 2, 2024
James P. Lederer
/s/ David Reeder
Director
May 2, 2024
David Reeder
/s/ Azita Saleki-Gerhardt
Director
May 2, 2024
Azita Saleki-Gerhardt