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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. __)
OSI SYSTEMS INC.
(Name of Issuer)
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Common Stock
(Title of Class of Securities)
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671044105
(CUSIP Number)
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December 31, 1998
(Date of Event Which Requires Filing of this Statement)
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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).
Potential persons who are to respond to the collection of
information contained in this form are not required to
respond unless the form displays a currently valid OMB
control number.
Page 1 of 6 pages
Cusip 671044105
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1
Names of Reporting Persons
I.R.S. Identification Nos. of above persons (entities only).
Brinson Partners, Inc.
36-3664388
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2
Check the Appropriate Box if a Member of a Group (See
Instructions)
a / /
b /x/ See Item 8 of attached schedule.
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3
SEC USE ONLY
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4
Citizenship or Place of Organization - Delaware
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Number of 5. Sole Voting Power _______
Shares Bene- 6. Shared Voting Power 877,400
ficially 7. Sole Dispositive Power _______
Owned by Each 8. Shared Dispositive Power 877,400
Reporting
Person With:
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9
Aggregate Amount Beneficially Owned by Each Reporting Person
877,400 Shares *
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10
Check if the Aggregate Amount in Row (11) Excludes Certain
Shares (See Instructions)
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11
Percent of Class Represented by Amount in Row (11)
8.9%
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12
Type of Reporting Person (See Instructions)
IA
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* Brinson Partners, Inc. disclaims beneficial ownership of
such securities.
Page 2 of 6 pages
Cusip 671044105
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1
Names of Reporting Persons
I.R.S. Identification Nos. of above persons (entities only).
UBS AG
98-0186363
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2
Check the Appropriate Box if a Member of a Group (See
Instructions)
a / /
b /x/ See Item 8 of attached schedule.
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3
SEC USE ONLY
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4
Citizenship or Place of Organization - Switzerland
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Number of 5. Sole Voting Power _______
Shares Bene- 6. Shared Voting Power 877,400
ficially 7. Sole Dispositive Power _______
Owned by Each 8. Shared Dispositive Power 877,400
Reporting
Person With:
- -----------------------------------------------------------
9
Aggregate Amount Beneficially Owned by Each Reporting Person
877,400 Shares *
- -----------------------------------------------------------
10
Check if the Aggregate Amount in Row (11) Excludes Certain
Shares (See Instructions)
- -----------------------------------------------------------
11
Percent of Class Represented by Amount in Row (11)
8.9%
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12
Type of Reporting Person (See Instructions)
BK See Item 3 of attached schedule.
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* UBS AG disclaims beneficial ownership of such securities.
Page 3 of 6 pages
Cusip 671044105
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Item 1(a). Name of Issuer:
OSI SYSTEMS INC.
Item 1(b). Address of Issuer's Principal Executive Offices:
12525 Chadron Avenue
Hawthorne, CA 90250
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Item 2(a) Name of Persons Filing:
Brinson Partners, Inc.("BPI") and UBS AG ("UBSAG").
Item 2(b) Address of Principal Business Office or, if none,
Residence:
BPI's principal business office is located at:
209 South LaSalle, Chicago, Illinois 60604-1295
UBSAG's principal business office is located at:
Bahnhofstrasse 45
8021, Zurich, Switzerland
Item 2(c) Citizenship:
Incorporated by reference to Item 4 of the cover pages.
Item 2(d) Title of Class of Securities:
Common Stock (the "Common Stock")
Item 2(e) CUSIP Number:
671044105
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Item 3. Type of Person Filing:
BPI is an Investment Adviser registered under section 203 of
the Investment Advisers Act of 1940. UBS AG is classified as
a Bank as defined in section 3(a)(6) of the Act pursuant to
no action relief granted by the staff of the Securities and
Exchange Commission.
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Item 4 (a)-(c)(iv). Ownership:
Incorporated by reference to Items 5-11 of the cover pages.
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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 / /.
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Page 4 of 6 pages
Cusip 671044105
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Item 6. Ownership of More than Five Percent on Behalf of
Another Person:
Accounts managed on a discretionary basis by BPI and/or UBS
AG have the right to receive or the power to direct the
receipt of dividends from, or the proceeds from the sale of,
the Common Stock. No account holds more than 5 percent of
the outstanding Common Stock.
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Item 7. Identification and Classification of the Subsidiary
Which Acquired the Security Being Reported on By the Parent
Holding Company:
[See item 3 above]
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Item 8 Identification and Classification of Members of the
Group:
BPI is an indirect wholly-owned subsidiary of UBS AG. UBS AG
is reporting indirect beneficial ownership of holdings by
reason of its ownership of BPI and UBS (USA) Inc., a parent
holding company of BPI. UBS AG does not hereby affirm the
existence of a group within the meaning of Rule 13d-5(b)(1).
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Item 9 Notice of Dissolution of Group:
Not Applicable
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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.
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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 3, 1999
Brinson Partners, Inc.
By:/s/ Mark F. Kemper By:/s/ Samuel W. Anderson
Mark F. Kemper Samuel W. Anderson
Assistant Secretary Vice President and Secretary
UBS AG
By: /s/ Louis R. Eber By:/s/ Janet R. Zimmer
Louis R. Eber Janet R. Zimmer
Executive Director Executive Director
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Page 5 of 6 pages
Cusip 671044105
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EXHIBIT 1
AGREEMENT TO MAKE A JOINT FILING
Brinson Partners, Inc. and UBS AG each agrees that this
Schedule 13G (including all amendments thereto) is filed by
and on behalf of each such party.
Date: February 3, 1999
Brinson Partners, Inc.
By:/s/ Mark F. Kemper By:/s/ Samuel W. Anderson
Mark F. Kemper Samuel W. Anderson
Assistant Secretary Vice President and Secretary
UBS AG
By: /s/ Louis R. Eber By:/s/ Janet R. Zimmer
Louis R. Eber Janet R. Zimmer
Executive Director Executive Director
Page 6 of 6 pages