OMNICARE INC
SC 13G, 1997-02-12
DRUG STORES AND PROPRIETARY STORES
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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.          )*
                                          ---------


                                 Omnicare, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
 
                   Common Stock, par value $1.00 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   681904108
                  --------------------------------------------
                                 (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 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

<PAGE>   2
CUSIP No. 681904108                       13G                  Page 2 of 4 Pages



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      A I M Management Group Inc., on behalf of itself and its wholly-owned
      subsidiaries, A I M Advisors, Inc. and A I M Capital Management, Inc.
      I.D. No. 74-1881407

- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       
                                                             (a) /  /
                                                             (b) /  /

- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION


      State of Delaware
- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

          NUMBER OF            
                               
           SHARES              -------------------------------------------------
                               6     SHARED VOTING POWER
        BENEFICIALLY           
                                     
          OWNED BY                   3,899,520
                               ------------------------------------------------
            EACH               7     SOLE DISPOSITIVE POWER
                    
          REPORTING 
                               
           PERSON              ------------------------------------------------
                               8     SHARED DISPOSITIVE POWER                  
            WITH    
                                     
                                     3,899,520
- ------------------------------------------------------------------------------- 
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


      3,899,520
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.1%

- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*


       HC
- --------------------------------------------------------------------------------



                     *SEE INSTRUCTION BEFORE FILLING OUT!


                              Page 2 of 4 pages

<PAGE>   3
                                  SCHEDULE 13G


             
Item 1(a)    NAME OF ISSUER:
             Omnicare, Inc.
             
Item 1(b)    ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
             2800 Chemed Center
             255 East Fifth Street
             Cincinnati, OH  45202-4728
             
Item 2(a)    NAME OF PERSON FILING:
             A I M Management Group Inc.
             
Item 2(b)    ADDRESS OF PRINCIPAL BUSINESS OFFICE:
             11 Greenway Plaza, Suite 1919
             Houston, Texas  77046
             
Item 2(c)    CITIZENSHIP:
             State of Delaware
             
Item 2(d)    TITLE OF CLASS OF SECURITIES:
             Common Stock, par value $1.00 per share
             
Item 2(e)    CUSIP NUMBER:
             681904108
             
Item 3       TYPE OF REPORTING PERSON:
             Parent Holding Company, in accordance with 
             section 240.13d-1(b)(ii)(G)
             
Item 4(a)    AMOUNT BENEFICIALLY OWNED AS OF DECEMBER 31, 1996:
             3,899,520 shares of common stock
             
Item 4(b)    PERCENT OF CLASS:
             5.1%
             
Item 4(c)    DEEMED VOTING POWER AND DISPOSITION POWER:
             (i)   sole power to vote or to direct the vote:  N/A
             (ii)  shared power to vote or to direct the vote:  3,899,520
             (iii) sole power to dispose or to direct the disposition of:  N/A
             (iv)  shared power to dispose or to direct the disposition of:
                   3,899,520
             
Item 5       OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:
             N/A
             
Item 6       OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:
             N/A
             
             
             
                          Page 3 of 4 pages
<PAGE>   4
Item 7       IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
             THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:
             A I M Advisors, Inc. and A I M Capital Management, Inc., 
             Investment Advisers registered under Section 203 of the 
             Investment Advisers Act
             
Item 8       IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:
             N/A
             
Item 9       NOTICE OF DISSOLUTION OF A GROUP:
             N/A
             
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
             purposes 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.
        
             
             Date:  February 12, 1997          A I M Management Group Inc.
             
             
             
             
                                               Carol F. Relihan
                                               Vice President,
                                               Secretary and General Counsel
             
             

** Please call Sharon Poessel at (713) 214-1126 with questions regarding this 
   filing.





                              Page 4 of 4 pages


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