CIDCO INC
SC 13G/A, 1997-03-25
TELEPHONE & TELEGRAPH APPARATUS
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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. 4)*

                               CIDCO Incorporated
                               ------------------
                                (Name of Issuer)

                     Common Stock, par value $0.01 per share
                     ---------------------------------------
                         (Title of Class of Securities)

                                   171768 10 4
                                   -----------
                                 (CUSIP Number)





Check the following box if a fee is being paid with the statement [ ]. (A fee is
not required only if the reporting 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  contain  ing  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).



                               Page 1 of 5 pages

<PAGE>



CUSIP No.  171768 10 4                   13G                   Page 2 of 5 Pages
- ---------  -----------                                         -----------------
                 
- --------------------------------------------------------------------------------
1   NAME OF REPORTING PERSON - S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
    Robert L. Diamond

- --------------------------------------------------------------------------------
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 Citizen

- --------------------------------------------------------------------------------
                    5      SOLE VOTING POWER
                           535,244
   NUMBER OF        ------------------------------------------------------------
    SHARES     
 BENEFICIALLY       6      SHARED VOTING POWER
   OWNED BY                -0-
     EACH           ------------------------------------------------------------
   REPORTING        7      SOLE DISPOSITIVE POWER      
    PERSON                 535,244                 
     WITH           ------------------------------------------------------------
                    8      SHARED DISPOSITIVE POWER
                           -0-                     
- --------------------------------------------------------------------------------
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    535,244

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


- --------------------------------------------------------------------------------
11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
    3.72%

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

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>



                                  SCHEDULE 13G


Item 1.

         (a)      CIDCO Incorporated.

         (b)      220 Cochrane Circle, Morgan Hill, California 95037.


Item 2.

         (a)      Robert L. Diamond.

         (b)      400 Columbus Avenue, Valhalla, New York 10595.

         (c)      United States citizen.

         (d)      Common Stock, par value $0.01 per share.

         (e)      CUSIP Number 171768 10 4.


Item 3.  If this statement is filed pursuant to Rule 13d-a(b), or 13d-2(b), 
         check whether the filing person is a:

         (a) - (h)         inapplicable.


Item 4.  Ownership

         (a)      535,244  shares  (includes  418,577  shares  and  a  currently
                  exercisable  option  to  purchase  116,667  shares)  of Common
                  Stock.

         (b)      3.72% of Class.

         (c)(i)  Filing  Person has sole power to vote 535,244  shares of Common
                 Stock.

            (ii) Filing  Person does not share power to vote or direct the vote 
                 of any  shares  of  Common  Stock.  

            (iii) Filing Person has sole dispositive  power over 535,244 shares 
                  of Common Stock.

            (iv) Filing Person does not share dispositive power over any shares 
                 of Common Stock.



                                      - 3 -

<PAGE>


Item 5.  Ownership of Five Percent or Less of a Class.

         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.


Item 6.  Ownership of More than Five Percent on Behalf of Another Person.

         Inapplicable.


Item 7.  Identification and Classification of the Subsidiary Which Acquired the
         Security Being Reported on By the Parent Holding Company.

         Inapplicable.


Item 8.  Identification and Classification of Members of a Group.

         Inapplicable.


Item 9.  Notice of Dissolution of Group.

         Inapplicable.


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 dot 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.



                                      - 4 -

<PAGE>


                                   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.



                              /s/ Robert L. Diamond
                              ---------------------
                                Robert L. Diamond


Dated: March 11, 1997




                                      - 5 -

<PAGE>



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