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Securities and Exchange Commission

Under the Securities Exchange Act of 1934
(Amendment No.)*

MKS Instruments, Inc.
(Name of Issuer)

Common Stock
(Title of Class of Securities)

(CUSIP Number)

	December 31, 2007
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

       1	Rule 13d-1(b)

       0	Rule 13d-1(c)

       0	Rule 13d-1(d)

*  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

Name of reporting persons:

I.R.S. Identification Nos. of above persons (Entities

Kornitzer Capital Management, Inc. ("KCM"), 48-

Check the appropriate box if a member of a group (See


SEC use only

Citizenship or place of organization:  Kansas

Number of
owned by
person with:

5.	Sole voting power:  3,156,712
6.	Shared voting power:  0
7.	Sole dispositive power:  2,987,568
8.	Shared dispositive power:  169,144

Aggregate amount beneficially owned by each reporting

Check if the aggregate amount in row (9) excludes certain shares (See

Percent of class represented by amount in row (9):  5.57%

Type of reporting person (See Instructions):  IA

Item 1.

       (a)	Name of issuer:  MKS Instruments, Inc.

(b)	Address of issuer's principal executive offices:
	Investor Relations
90 Industrial Way
Wilmington, Massachusetts 01887

Item 2.

       (a)	Name of person filing:  Kornitzer Capital Management, Inc. ("KCM")

(b)	Address of principal business offices or, if none, residence:
5420 West 61st Place
Shawnee Mission, KS  66205

       (c)	Citizenship:  Kansas

       (d)	Title of class of securities:  Common stock, no par value

       (e)	CUSIP number:  55306N104

Item 3.  If this statement is filed pursuant to Secs. 240.13d-1(b) or 240.13d-
2(b) or (c), check whether the person filing is a:

(a)	0	Broker or dealer registered under section 15 of the Act
(15 U.S.C. 78c).
(b)	0	Bank as defined in section 3(a)(6) of the Act (15 U.S.C.
(c)	0	Insurance company as defined in section 3(a)(19) of the
Act (15 U.S.C. 78c).
(d)	0	Investment company registered under section 8 of the
Investment Company Act (15 U.S.C. 80a-8).
(e)	1	An investment adviser in accordance with section
(f)	0	An employee benefit plan or endowment fund in accordance
with section 240.13d-1(b)(1)(ii)(F).
(g)	0	A parent holding company or control person in accordance
with section 240.13d-1(b)(ii)(G).
(h) 	0	A savings association as defined in Section 3(b) of the
Federal Deposit Insurance Act (12 U.S.C. 1813).

(i)	0	A church plan that is excluded from the definition of an
investment company under section 3(c)(14) of the
Investment Company Act of 1940 (15 U.S.C. 80a-3).

(j)	0	Group, in accordance with section 240.13d-1(b)(ii)(J).

Item 4.	  Ownership.
       The following information regarding the aggregate number and percent
of he class of securities identified in Item 1 is provided as follows:

       (a)	Amount beneficially owned:  3,156,712

(b)	Percent of class:  5.57%

(c)	Number of shares as to which such person has:

(i)	sole power to vote or to direct the vote:  3,156,712

(ii)	shared power to vote or to direct the vote:   0

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

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

Item 5.	  Ownership of Five Percent or Less of a Class.

       If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following 0.

Item 6.	  Ownership of More than Five Percent on Behalf of Another Person.
       KCM is an investment adviser with respect to the shares of common
stock for the accounts of other persons who have the right to receive, and
the power to direct the receipt of, dividends from, or the proceeds from the
sale of, the common stock of MKS Instruments, Inc.

Item 7.	  Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company or Control
       A parent holding company or control person is not filing this Schedule,
pursuant to Rule 13d-1(b)(ii)(G) promulgated under the Securities Exchange
Act of 1934 (the "Act").

Item 8.	  Identification and Classification of Members of the Group.
       A group is not filing this Schedule pursuant to Rule 13d-1(b)(ii)(J).

Item 9.	  Notice of Dissolution of Group.
       A notice of dissolution is not applicable to the filing of this Schedule.

Item 10.  Certification.
(a)	The following certification shall be included if the statement is
filed pursuant to Sec. 240.13d-1(b):

       By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were acquired and are held in the ordinary
course of business and were not acquired and are not held for the purpose of or
with the effect of changing or influencing the control of the issuer of the
securities and were not acquired and are not held in connection with or as a
participant in any transaction having that purposes or effect.


       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

                                            Date:  February 13, 2008


                                            /s/ John C. Kornitzer

                                            By:  John C. Kornitzer, President

CUSIP NO. 55306N104

WA 742553.1

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