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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) COMMON STOCK, no par value - ------------------------------------------------------------------------------ (Title of Class of Securities) 671044 10 5 -------------------------------------------- (CUSIP Number) *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 disclosures provided in a prior cover page. The information required on 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). CUSIP No. 671044 10 5 13G Page 2 of 5 Pages 1 NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Mohini Syal 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [_] (b) [_] 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5 SOLE VOTING POWER 0 6 SHARED VOTING POWER 708,584 7 SOLE DISPOSITIVE POWER 0 8 SHARED DISPOSITIVE POWER 708,584 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 708,584 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_] 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.4% 12 TYPE OF REPORTING PERSON* IN *SEE INSTRUCTION BEFORE FILLING OUT! 2 of 5 ITEM 1. NAME AND ADDRESS OF ISSUER (a) This Schedule 13G relates to the Common Stock, no par value, of OSI Systems, Inc., a California corporation (the "Issuer"). (b) The address of the Issuer's principal executive office is 12525 Chadron Avenue, Hawthorne, California 90250. ITEM 2. NAME AND ADDRESS OF PERSON FILING; TITLE OF SECURITIES (a) This Schedule 13G is filed by Mohini Syal. (b) The filing person's business address is 24205 Hawthorne Blvd., Torrance, California 90505. (c) Mohini Syal is a United States citizen. (d) The class of securities to which this Schedule 13G relates is the Common Stock, no par value, of the Issuer. (e) The CUSIP number of such securities is 671044 10 5. ITEM 3. STATEMENTS FILED PURSUANT TO RULES 13D-1(B) OR 13D-2(B) This statement is not filed pursuant to Rule 13d-1(b) or 13d-2(b). ITEM 4. OWNERSHIP (a) As of December 31, 1997, the filing person beneficially owned 708,584 shares. (b) Such ownership constituted 7.4% of the class. (c) As to such shares, the number of shares as to which such person has: (i) sole power to vote or to direct the vote is 0, (ii) shared power to vote or to direct the vote is 708,584, (iii) sole power to dispose or to direct the disposition of is 0, and (iv) shared power to dispose or to direct the disposition of is 708,584. ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS Not applicable. 3 of 5 ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON Of the 708,584 shares beneficially owned by Mohini Syal, 254,951 shares and 254,951 shares are owned by The Deepika Chopra Trust UDT dated July 17, 1987 and The Chandini Chopra Trust UDT dated July 17, 1987, respectively, and 198,682 shares are owned by the Syal Trust. Mohini Syal is the co-trustee of all such trusts. Deepika Chopra and Chandini Chopra are the grand-daughters of Mohini Syal. Such other persons have the right to receive dividends from, and proceeds from the sale of, such securities. 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 THE GROUP Not applicable. ITEM 9. NOTICE OF DISSOLUTION OF GROUP Not applicable. ITEM 10. CERTIFICATION This Schedule 13G is not filed pursuant to Rule 13d-1(b). 4 of 5 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 13, 1998 /s/ Mohini Syal --------------------------------- Mohini Syal Note: Six copies of this statement, including all exhibits, should be filed with the Commission ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001) 5 of 5