MATHSOFT INC
SC 13D/A, 1998-02-10
PREPACKAGED SOFTWARE
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3)*

                                 MATHSOFT, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          COMMON STOCK, $.01 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    576798102
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                             Lisel M. Mittelholzer,
                      c/o Testa, Hurwitz & Thibeault, LLP,
                                125 High Street,
                      High Street Tower, Boston, MA 02110
- --------------------------------------------------------------------------------
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)

                                February 10, 1998
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


<PAGE>   2

                                  

- ---------------------------                          ---------------------------
  CUSIP No.  576798102            SCHEDULE 13D        Page  2  of  5 Pages
- --------------------------------------------------------------------------------
1.      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        CHARLES J. DIGATE
        ###-##-####
- --------------------------------------------------------------------------------
2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*               (a) [ ]
                                                                        (b) [ ]
- --------------------------------------------------------------------------------
3.      SEC USE ONLY

- --------------------------------------------------------------------------------
4.      SOURCE OF FUNDS*

        
- --------------------------------------------------------------------------------
5.      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
        ITEMS 2(d) or 2(e)                                                  [ ]
- --------------------------------------------------------------------------------
6.      CITIZENSHIP OR PLACE OF ORGANIZATION
        
        U.S.A.
- --------------------------------------------------------------------------------
                         7.       SOLE VOTING POWER

                                  769,099
  NUMBER OF              -------------------------------------------------------
   SHARES                8.       SHARED VOTING POWER 
BENEFICIALLY
  OWNED BY                        0
    EACH                 -------------------------------------------------------
 REPORTING               9.       SOLE DISPOSITIVE POWER
  PERSON                          
   WITH:                          769,099   
                         -------------------------------------------------------
                         10.      SHARED DISPOSITIVE POWER
                                 
                                  0
- --------------------------------------------------------------------------------
11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        769,099
- --------------------------------------------------------------------------------
12.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        7.9%
- --------------------------------------------------------------------------------
14.     TYPE OF REPORTING PERSON*
   
        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.






<PAGE>   3

ITEM 1: SECURITY AND ISSUER:

        Common Stock, $.01 par value per share ("Common Stock"), of MathSoft,
        Inc., a Massachusetts corporation (the "Company"). The address of the
        Company's principal executive office is 101 Main Street, Cambridge, MA
        02142.

ITEM 2: IDENTITY AND BACKGROUND:

        (a)      Charles J. Digate.

        (b)      14 Oxford Street, Winchester, MA  01890.

        (c)      President and Chief Executive Officer of the Company.

        (d)      None.

        (e)      None.

        (f)      USA.

ITEM 3: SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION:

        Not applicable. This Schedule 13D is being filed because Mr. Digate
        has additional options which are currently exercisable or will become
        exercisable within sixty (60) days of the date of this report.

ITEM 4: PURPOSE OF TRANSACTION:

        The shares held by Mr. Digate are being held for investment purposes.
        Mr. Digate has no present plan or proposal to affect substantial
        changes in the business, organization, form or control of the Company
        in his role as a stockholder.

ITEM 5: INTEREST IN SECURITIES OF THE ISSUER:

        (a)  Mr. Digate beneficially owns an aggregate of 769,099 shares, or
             7.9%, of the Company's Common Stock. Of this total, 599,375 shares
             are stock options which are currently exercisable or will become
             exercisable within sixty (60) days of the date of this report. The
             percentage is calculated by dividing the number of shares
             beneficially owned by Mr. Digate by the sum of: (i) the 9,074,335
             shares of Common Stock reported to be outstanding on October 31,
             1997 on the Company's Quarterly Report on Form 10-Q for the
             quarter ended September 30, 1997; and (ii) the 599,375 stock
             options beneficially owned by Mr. Digate that are exercisable
             within sixty (60) days of the date of this report.

        (b)  Mr. Digate has the sole power to vote, to direct the vote,
             dispose, or to direct the disposition of 769,099 shares of Common
             Stock beneficially owned by him.

        (c)  On December 31, 1997, 39,062 stock options became exercisable at
             exercise prices of $2.00 and $3.00 per share and an additional
             45,312 options will become exercisable within 60 days of the date
             of this report at exercise prices of $2.00, $2.6875 and $3.00 per
             share.

         (d)  Not applicable.


                                Page 3 of 5 Pages


<PAGE>   4


 





          (e)  Not applicable.

ITEM 6:   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS, OR RELATIONSHIPS WITH RESPECT
          TO THE SECURITIES OF THE ISSUER:
          Not applicable.

ITEM 7:   MATERIAL TO BE FILED AS EXHIBITS:
          None.


                  [remainder of page intentionally left blank]



                                Page 4 of 5 Pages


<PAGE>   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 10, 1998                             /s/ Charles J. Digate
                                             -----------------------------------
                                             Charles J. Digate



                                Page 5 of 5 Pages




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