-----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, MZGpYO2WnIu6O930Ek3wGQXNUOLCxQxcXmk4Jd975kiBi15VBtgaSzvACD34Lp6X Mb+VGG2s0iSqrY2mEsjwIQ== 0000950124-99-001012.txt : 19990215 0000950124-99-001012.hdr.sgml : 19990215 ACCESSION NUMBER: 0000950124-99-001012 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 19990212 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: POWER INTEGRATIONS INC CENTRAL INDEX KEY: 0000833640 STANDARD INDUSTRIAL CLASSIFICATION: SEMICONDUCTORS & RELATED DEVICES [3674] IRS NUMBER: 943065014 STATE OF INCORPORATION: CA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G SEC ACT: SEC FILE NUMBER: 005-52867 FILM NUMBER: 99533509 BUSINESS ADDRESS: STREET 1: 477 NORTH MATHILDA AVENUE CITY: SUNNYVALE STATE: CA ZIP: 94086 BUSINESS PHONE: 4085239210 MAIL ADDRESS: STREET 1: 477 NORTH MATHILDA AVENUE CITY: SUNNYVALE STATE: CA ZIP: 94086 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: DRIEHAUS CAPITAL MANAGEMENT INC CENTRAL INDEX KEY: 0000938206 STANDARD INDUSTRIAL CLASSIFICATION: [] IRS NUMBER: 363196026 STATE OF INCORPORATION: IL FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 25 EAST ERIE ST CITY: CHICAGO STATE: IL ZIP: 60611 BUSINESS PHONE: 3125873800 MAIL ADDRESS: STREET 1: 25 EAST ERIE ST CITY: CHICAGO STATE: IL ZIP: 60611 SC 13G 1 STATEMENT OF BENEFICIAL OWNER BY CERTAIN PERSON 1 --------------------------- OMB APPROVAL --------------------------- OMB Number: 3235-0145 Expires: October 31, 1994 Estimated average burden hours per response... 14.90 --------------------------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. _________________)* Power Integrations Inc. - -------------------------------------------------------------------------------- (NAME OF ISSUER) Common - -------------------------------------------------------------------------------- (TITLE OF CLASS OF SECURITIES) 739276103 -------------------------------- (CUSIP NUMBER) Check the following box if a fee is being paid with this statement [ ]. (A fee is not required only if the filing person: (1) has a previous statement on file reporting beneficial ownership of more than five percent of the class of securities described in Item 1; and (2) has filed no amendment subsequent thereto reporting beneficial ownership of five percent or less of such class.) (See Rule 13d-7). *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 4 pages 2 - ---------------------- --------------------------- CUSIP NO. 739276103 13G PAGE _____ of _____ PAGES - ---------------------- --------------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Driehaus Capital Management, Inc. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION ILLINOIS, U.S.A. - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 370,122 NUMBER OF SHARES ---------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY EACH 0 REPORTING PERSON ---------------------------------------------------------- WITH 7 SOLE DISPOSITIVE POWER 883,128 ---------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 883,128 - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.10% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA - -------------------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT! Page 2 of 4 pages 3 Driehaus Capital Management, Inc. SCHEDULE 13G Item 1. (a) Name of Issuer: Power Integrations Inc. (b) Issuer's Principal Executive Offices: 477 North Mathilda Avenue Sunnyvale, California 94086 Item 2. (a) Person Filing - Driehaus Capital Management, Inc. (b) Address - 25 East Erie Street Chicago, IL 60611 (c) Citizenship - U.S.A. (d) Title of Class of Securities - Common (e) CUSIP Number - 739276103 Item 3. (e) Investment Adviser Registered under section 203 of the Investment Advisers Act of 1940. Item 4. (a) Amount Beneficially Owned - 883,128 (b) Percent of Class - 7.10% (c) Number of shares as to which reporting person has: (i) Sole voting power 370,122 (ii) Shared voting power 0 (iii) Sole dispositive power 883,128 (iv) Shared dispositive power 0 Item 5. Not Applicable Item 6. The reporting person, Driehaus Capital Management, Inc., manages accounts for numerous clients on a fully discretionary basis. Securities held in these clients' accounts are included in this report to reflect the fact that the reporting person may have voting power or dispositive power. To the best of the reporting person's knowledge, none of the clients whose securities are included in this report have an ownership interest in the subject class of securities which exceeds five percent of the class. Page 3 of 4 4 Driehaus Capital Management, Inc. SCHEDULE 13G Item 7. Not Applicable Item 8. Not Applicable Item 9. Not Applicable Item 10. Certification 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 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. February 8, 1999 ---------------------------------------- Date /s/ Mary H. Weiss ---------------------------------------- Signature Mary H. Weiss, Vice President ---------------------------------------- Name/Title Page 4 of 4 -----END PRIVACY-ENHANCED MESSAGE-----