===================================================================== SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Information statement pursuant to Rule 13d-1 and 13d-2 (Amendment No.1)(1) Unifirst Corporation (Name of issuer) Common Stock ($.10 par value per share) (Title of class of securities) 904708104 (CUSIP number) (Continued on following page (s)) (Page 1 of 5 Pages) _________ (1) 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 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 of 5 Pages CUSIP No. 904708104 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Societe Generale Asset Management Corp. 13-3557071 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OF PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5. SOLE VOTING POWER 0 6. SHARED VOTING POWER 789,500 Shared with its investment advisory client(s). 7. SOLE DISPOSITIVE POWER 0 8. SHARED DISPOSITIVE POWER 789,500 Shared with its investment advisory client(s). 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON: 789,500 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 10.01% 12. TYPE OF REPORTING PERSON* IA - ---------------------------------------------------------------------- SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Item 1 (a) Name of Issuer: Unifirst Corporation (the "Issuer"). (b) Address of Issuer's Principal Executive Offices: 68 Jonspin Road, Wilmington, MA 01887 Item 2 (a) Names of Persons Filing: Societe Generale Asset Management Corp., a Delaware corporation (the "Adviser"). (b) Address of Principal Business Office: The principal business office of the Adviser is located at 1221 Avenue of the Americas, New York, NY 10020. (c) Citizenship: The Adviser is a Delaware corporation. (d) Title of Class of Securities: Common Stock ($.10 par value per share) (the "Shares"). (e) CUSIP Number: 904708104 Item 3 The persons filing this Schedule 13G are: (e) an investment adviser registered under Section 203 of the Investment Advisers Act of 1940, as amended (the "Adviser"). Page 3 of 5 - ---------------------------------------------------------------------- Schedule 13G Item 4 Ownership. (a) Amount Beneficially Owned: The Adviser beneficially owns 789,500 Shares. (b) Percentage of class: The Adviser beneficially owns 10.01% of the outstanding Shares. (c) Number of Shares As to Which Such Persons Have: (i) sole power to vote or direct the vote: The Adviser: 789,500. (ii) shared power to vote or direct the vote: None (iii) sole power to dispose or to direct the disposition of: The Adviser: 789,500. (iv) shared power to dispose or to direct the disposition of: None 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 the Group. Not Applicable. Item 9 Notice of Dissolution of Group: Not Applicable. Page 4 of 5 - ------------------------------------------------------------------ Schedule 13G Item 10 Certification. By signing below, I certify that, 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. Dated: March 10, 1997 SOCIETE GENERALE ASSET MANAGEMENT CORP. By: /s/ Jean-Marie Eveillard Title: Jean-Marie Eveillard, President Page 5 of 5