-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, UmkT1K+BFznRUKp3lCp7UI50CxDSOPCrC1/PxA2c9tfZa395BXazuCTxqSLNXi81 Jf0C7WBxlXx5PLE+9i9gfQ== 0000932471-05-000339.txt : 20050211 0000932471-05-000339.hdr.sgml : 20050211 20050211141530 ACCESSION NUMBER: 0000932471-05-000339 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 2 FILED AS OF DATE: 20050211 DATE AS OF CHANGE: 20050211 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: MYKROLIS CORP CENTRAL INDEX KEY: 0001133082 STANDARD INDUSTRIAL CLASSIFICATION: LABORATORY ANALYTICAL INSTRUMENTS [3826] IRS NUMBER: 043536767 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-77998 FILM NUMBER: 05597198 BUSINESS ADDRESS: STREET 1: 129 CONCORD ROAD CITY: BILLERICA STATE: MA ZIP: 01821 BUSINESS PHONE: 978-436-6680 MAIL ADDRESS: STREET 1: 129 CONCORD ROAD CITY: BILLERICA STATE: MA ZIP: 01821 FORMER COMPANY: FORMER CONFORMED NAME: MILLIPORE MICROELECTRONICS INC DATE OF NAME CHANGE: 20010123 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: VANGUARD HORIZON FUNDS CENTRAL INDEX KEY: 0000932471 STANDARD INDUSTRIAL CLASSIFICATION: UNKNOWN SIC - 0000 [0000] IRS NUMBER: 232787277 STATE OF INCORPORATION: DE FISCAL YEAR END: 1031 FILING VALUES: FORM TYPE: SC 13G/A BUSINESS ADDRESS: STREET 1: P O BOX 2600 STREET 2: V26 CITY: VALLEY FORGE STATE: PA ZIP: 19482 BUSINESS PHONE: 6106696295 MAIL ADDRESS: STREET 1: P.O. BOX 2600 STREET 2: V26 CITY: VALLEY FORGE STATE: PA ZIP: 19482 FORMER COMPANY: FORMER CONFORMED NAME: VANGUARD HORIZON FUND INC DATE OF NAME CHANGE: 19941107 SC 13G/A 1 mykroliscorp.htm

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Schedule 13G

Under the Securities Exchange Act of 1934

(Amendment No.: 2 )*

Name of issuer: Mykrolis Corp

Title of Class of Securities: Common

CUSIP Number: 62852P103

Date of Event Which Requires Filing of this Statement: December 31, 2004

Check the appropriate box to designate the rule pursuant to which this Schedule is filed: (X) Rule 13d-1(b) ( ) Rule 13d-1(c) ( ) 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 Notes).

(Continued on the following page(s))

13G

CUSIP No.: 62852P103

1. NAME OF REPORTING PERSON
S.S.OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

Vanguard Horizon Funds - Vanguard Capital Opportunity Fund

2. CHECK THE APPROPRIATE [LINE] IF A MEMBER OF A GROUP

A. B. X

3. SEC USE ONLY

4. CITIZENSHIP OF PLACE OF ORGANIZATION

Delaware

(For questions 5-8, report the number of shares beneficially owned by each reporting person with:)

5. SOLE VOTING POWER

2,126,410

6. SHARED VOTING POWER

-0-

7. SOLE DISPOSITIVE POWER

-0-

8. SHARED DISPOSITIVE POWER

-0-

9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

2,126,410

10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

N/A

11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

5.08

12. TYPE OF REPORTING PERSON

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Act of 1934

Check the following [line] if a fee is being paid with this statement N/A

Item 1(a) — Name of Issuer:

Mykrolis Corp

Item 1(b) — Address of Issuer’s Principal Executive Offices:

129 Concord Road, Billerica, MA 01821

Item 2(a) — Name of Person Filing:

Vanguard Horizon Funds - Vanguard Capital Opportunity Fund

Item 2(b) – Address of Principal Business Office or, if none, residence:

100 Vanguard Blvd., Malvern, PA 19355

Item 2(c) –Citizenship:

The fund is a business trust organized under the laws of the Commonwealth of Delaware.

Item 2(d) — Title of Class of Securities:

Common

Item 2(e) — CUSIP Number

62852P103

Item 3 — Type of Filing:

This statement is being filed pursuant to Rule 13d-1. The person filing is an investment company registered under Section 8 of the Investment Company Act.

Item 4 — Ownership:

(a) Amount Beneficially Owned:

2,126,410

(b) Percent of Class:

5.08

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

(i) sole power to vote or direct to vote: 2,126,410

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

(iii) sole power to dispose of or to direct the disposition of: -0-

(iv) shared power to dispose or to direct the disposition of: -0-

Item 5 — Ownership of Five Percent or Less of a Class:

Not applicable

Item 6 — Ownership of More Than Five Percent on Behalf of Another Person:

Not applicable

Item 7 — Identification and Classification of the Subsidiary Which Acquired The Security Being Reported on by the Parent Holding Company:

Not applicable

Item 8 — Identification and Classification of Members of Group:

Not applicable

Item 9 — Notice of Dissolution of Group:

Not applicable

Item 10 — Certification:

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

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.

Date: February 11, 2005

Name: Christopher Wightman
Title: Assistant Secretary

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