AIM MANAGEMENT GROUP INC
SC 13G, 1996-07-10
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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.         )*
                                          ---------


                              ACT Networks, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)

                   Common Stock, par value $.001 per share
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                   000975102
                  --------------------------------------------
                                 (CUSIP Number)


Check the following box if a fee is being paid with this statement /X/.  (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*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
                                 SCHEDULE 13G

CUSIP NO. 000975102                                         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                      929,100
  BY EACH       ----------------------------------------------------------------
 REPORTING          7    SOLE DISPOSITIVE POWER
PERSON WITH 
                ----------------------------------------------------------------
                    8    SHARED DISPOSITIVE POWER

                              929,100
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      929,100

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


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

      10.4%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      HC

- --------------------------------------------------------------------------------

                     *SEE INSTRUCTION BEFORE FILLING OUT!


                              Page 2 of 4 pages
<PAGE>   3



                                  SCHEDULE 13G

<TABLE>
<S>          <C>

Item 1(a)    NAME OF ISSUER:
             ACT Networks, Inc.
           
Item 1(b)    ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
             188 Camino Ruiz
             Camarillo, CA  93012
           
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 $.001 per share
           
Item 2(e)    CUSIP NUMBER:
             000975102
           
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 JUNE 30, 1996:
             929,100 shares of common stock
           
Item 4(b)    PERCENT OF CLASS:
             10.4%
           
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:               929,100 
             (iii) sole power to dispose or to direct the disposition of:    N/A 
             (iv)  shared power to dispose or to direct the disposition of:  929,100
           
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
           
           

</TABLE>



                               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:  July 10, 1996                 A I M Management Group Inc.
                                         
                                                 /s/ CAROL F. RELIHAN
                                         
                                                 Carol F. Relihan
                                                 Vice President, Secretary and 
                                                   General Counsel



                               Page 4 of 4 pages


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