UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                SCHEDULE 13G/A

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 1)*

                                 Entegris, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    29362U104
                         ------------------------------
                                 (CUSIP Number)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



                                   Page 1 of 5


-------------------                                            -----------------
CUSIP No. 29362U104                 13G/A                      Page 2 of 5 Pages
-------------------                                            -----------------
--------------------------------------------------------------------------------
 1         NAME OF REPORTING PERSON
           S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Entegris, Inc. Employee Stock Ownership Plan
--------------------------------------------------------------------------------
 2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*     Not applicable.
                            (a) [_]
                            (b) [_]
--------------------------------------------------------------------------------
 3         SEC USE ONLY

--------------------------------------------------------------------------------
 4         CITIZENSHIP OR PLACE OF ORGANIZATION The Entegris, Inc. Employee
           Stock Ownership Plan shall be construed according to the laws of the
           State of Minnesota, except to the extent that such laws have been
           specifically preempted by ERISA or other federal legislation.

--------------------------------------------------------------------------------
                                       5      SOLE VOTING POWER

                                              0
                                      ------------------------------------------
    NUMBER OF                          6      SHARED VOTING POWER
     SHARES
  BENEFICIALLY                                12,707,730
    OWNED BY                          ------------------------------------------
      EACH                             7      SOLE DISPOSITIVE POWER
   REPORTING
     PERSON                                   12,707,730
      WITH                            ------------------------------------------
                                       8      SHARED DISPOSITIVE POWER

                                              0
--------------------------------------------------------------------------------
 9         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           12,707,730
--------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

--------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           18.18%
--------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           EP
--------------------------------------------------------------------------------

                      * SEE INSTRUCTION BEFORE FILLING OUT!

                                   Page 2 of 5


Item 1.

          (a)  Name of Issuer:

               Entegris, Inc.

          (b)  Address of Issuer's Principal Executive Office:

               3500 Lyman Boulevard
               Chaska, MN 55318

Item 2.

          (a)  Name of Person Filing:

               Entegris, Inc. Employee Stock Ownership Plan

          (b)  Address of Principal Business Office:

               c/o Stephen J. Hartman, Jr.
               HSBC Bank USA
               140 Broadway, 11th Floor
               New York, NY  10005-1180

          (c)  Citizenship:

               Not applicable.

          (d)  Title of Class of Securities:

               Common Stock, $.01 par value

          (e)  CUSIP Number:

               29362U104

Item 3.

          (a)-(e)  Not Applicable.

          (f)  [X]  Employee Benefit Plan, Pension Plan which is subject to the
                    provisions of the Employee Retirement Income Security Act of
                    1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F).

          (g)-(h)  Not applicable.


                                   Page 3 of 5


Item 4.   Ownership

          (a)  Amount beneficially owned as of December 31, 2001:

               12,707,730

          (b)  Percent of Class:

               18.18%

          (c)  Number of Shares as to Which Such Person Has:

               (i)  sole power to vote or direct the vote:

                    0

               (ii) shared power to vote or direct the vote:

                    12,707,730

              (iii) sole power to dispose or direct the disposition of:

                    12,707,730

               (iv) shared power to dispose or to direct the disposition of:

                    0

Item 5.   Not Applicable.

Item 6.   The reporting person is trustee ("Trustee") for the Entegris, Inc.
          Employee Stock Ownership Plan ("ESOP"). As Trustee, the reporting
          person is deemed to beneficially own the shares listed in response to
          Item 4(a), which represent shares of Common Stock held by the ESOP. As
          Trustee, the reporting person has the right to receive, and the power
          to direct the receipt of, dividends from the shares.

Items 7-10.  Not Applicable.


                                   Page 4 of 5


                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


Dated:  February 13, 2002

                                       ENTEGRIS, INC. EMPLOYEE
                                       STOCK OWNERSHIP PLAN

                                       BY: HSBC Bank USA, solely in its
                                           capacity as Trustee


                                       By: /s/ Stephen J. Hartman, Jr.
                                          --------------------------------------
                                          Stephen J. Hartman, Jr.
                                          Senior Vice President,
                                          Trust and Investment Management



                                   Page 5 of 5