SCHEDULE 13G
(RULE 13d-102)
Information to be Included in Statements Filed Pursuant to Rule 13d-1(b), (c)
and (d) and Amendments Thereto Filed Pursuant to Rule 13d-2.
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. ___________)*
MRV Communications
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(Name of Issuer)
Common
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(Title of Class of Securities)
553477100
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(CUSIP Number)
December 31, 1999
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(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[ ] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[X] 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).
<PAGE> 2
CUSIP NO. 13G PAGE ___ OF ___ PAGES
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1 Names of Reporting Persons/I.R.S. Identification Nos. of Above Persons
(Entities Only)
Driehaus Capital Management, Inc. 36-3196026
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2 Check the Appropriate Box if a Member of a Group (a) [ ]
(See Instructions) (b) [ ]
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3 SEC Use Only
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4 Citizenship or Place of Organization
Illinois, U.S.
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Number of
5 Sole Voting Power
Shares 1,080,782
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Beneficially 6 Shared Voting Power
0
Owned by -----------------------------------------------------
7 Sole Dispositive Power
Each 1,772,095
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Reporting 8 Shared Dispositive Power
Person With 0
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9 Aggregate Amount Beneficially Owned by Each Reporting Person
1,772,095
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