CONCEPTRONIC INC / DE
SC 13G/A, 1996-02-13
SPECIAL INDUSTRY MACHINERY, NEC
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<PAGE>

                               UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549

                                SCHEDULE 13G

                 Under the Securities Exchange Act of 1934
                          (Amendment No.   2   )*
                                         ------

                             Conceptronics, Inc.
                     ----------------------------------
                              (Name of Issuer)

                        Common Stock, $.01 Par Value
                     ----------------------------------
                       (Title of Class of Securities)

                                206010100
                     ----------------------------------
                              (CUSIP Number)

   Check the  following box if a fee is being paid with this statement / /.  (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 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).


                        (Continued on following page(s))


                              Page 1 of  11  Pages
                                        ----
<PAGE>

CUSIP No. 206010100                   13G                 Page  2  of  11  Pages
          ---------                                            ---    ----

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.  S.S. or I.R.S. Identification Nos. of Above
     Persons

              Special Situations Fund III, L.P. ("The Fund")
              F13-3737427
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member     (a)  / /
     of a Group*                               (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization

              Delaware
- -------------------------------------------------------------------------------
Number of Shares              (5) Sole Voting
 Beneficially                       Power                  None
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting
 Person With                        Power                  None
                             --------------------------------------------------
                              (7) Sole Dispositive
                                    Power                  None
                             --------------------------------------------------
                              (8) Shared Dispositive
                                    Power                  None
- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person

              None
- -------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)

              0
- -------------------------------------------------------------------------------
(12) Type of Reporting Person*

              IV
- -------------------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>

CUSIP No. 206010100                   13G                 Page  3  of  11  Pages
          ---------                                            ---    ----

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.  S.S. or I.R.S. Identification Nos. of Above
     Persons

              MGP Advisers Limited Partnership ("MGP")
              F13-3263120
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member     (a)  / /
     of a Group*                               (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization

              Delaware
- -------------------------------------------------------------------------------
Number of Shares              (5) Sole Voting
 Beneficially                       Power                  None
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting
 Person With                        Power                  None
                             --------------------------------------------------
                              (7) Sole Dispositive
                                    Power                  None
                             --------------------------------------------------
                              (8) Shared Dispositive
                                    Power                  None
- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person

              None
- -------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)

              0
- -------------------------------------------------------------------------------
(12) Type of Reporting Person*

              IA
- -------------------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>

CUSIP No. 206010100                   13G                 Page  4  of  11  Pages
          ---------                                            ---    ----

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.  S.S. or I.R.S. Identification Nos. of Above
     Persons

              AWM Investment Company, Inc. ("AWM")
              11-3086452
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member     (a)  / /
     of a Group*                               (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization

              Delaware
- -------------------------------------------------------------------------------
Number of Shares              (5) Sole Voting
 Beneficially                       Power                  None
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting
 Person With                        Power                  None
                             --------------------------------------------------
                              (7) Sole Dispositive
                                    Power                  None
                             --------------------------------------------------
                              (8) Shared Dispositive
                                    Power                  None
- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person

              None
- -------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)

              0
- -------------------------------------------------------------------------------
(12) Type of Reporting Person*

              IA
- -------------------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>

CUSIP No. 206010100                   13G                 Page  5  of  11  Pages
          ---------                                            ---    ----

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.  S.S. or I.R.S. Identification Nos. of Above
     Persons

              Austin W. Marxe
              ###-##-####
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member     (a)  / /
     of a Group*                               (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization

              United States
- -------------------------------------------------------------------------------
Number of Shares              (5) Sole Voting
 Beneficially                       Power                  None
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting
 Person With                        Power                  None
                             --------------------------------------------------
                              (7) Sole Dispositive
                                    Power                  None
                             --------------------------------------------------
                              (8) Shared Dispositive
                                    Power                  None
- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person

              None
- -------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)

              0
- -------------------------------------------------------------------------------
(12) Type of Reporting Person*

              IN
- -------------------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>

                                                              Page 6 of 11 Pages

Item 1.


(a)       NAME OF ISSUER:  Conceptronics Inc.

(b)       ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
          6 Post Road, Portsmouth,  NH 03801-5622

Item 2.
(a)-(c)   NAME OF PERSON FILING; ADDRESS OF PRINCIPAL BUSINESS OFFICE; AND PLACE
          OF ORGANIZATION:  This statement is filed on behalf of (i) Special
          Situations Fund III, L.P., a Delaware limited partnership (the
          "Fund"), (ii) MGP Advisers Limited Partnership, a Delaware Limited
          Partnership ("MGP"), (iii) AWM Investment Company, Inc., a Delaware
          corporation ("AWM") and (iv) Austin W. Marxe.  Each of the foregoing
          is hereinafter individually referred to as a "Reporting Person" and
          collectively as the "Reporting Persons."  The principal office and
          business address of the Reporting Persons is 153 East 53 Street, New
          York, New York 10022.  The business of the Fund is to acquire,
          purchase, invest in, sell, convey, transfer, exchange and otherwise
          trade in principally equity and equity related securities. MGP is a
          general partner of and investment adviser to the Fund.  MGP is
          registered as an investment adviser under the Investment Advisers Act
          of 1940, as amended. The principal business of MGP is to act as a
          general partner of and investment adviser to the Fund.  AWM, a
          Delaware corporation primarily owned by Austin W. Marxe, serves as the
          sole general partner of MGP.  AWM is a registered investment adviser
          under the Investment Advisers Act of 1940 and also serves as the
          investment adviser to, and general partner of,
<PAGE>

                                                              Page 7 of 11 Pages

          Special Situations Cayman Fund, L.P., a limited partnership formed
          under the laws of the Cayman Islands (the "Cayman Fund").  Austin W.
          Marxe is the principal limited partner of MGP and is the President and
          Chief Executive Officer of AWM. Mr. Marxe is also an associated person
          of MGP and is principally responsible for the selection, acquisition
          and disposition of the portfolio securities by AWM on behalf of MGP,
          the Fund and the Cayman Fund.

2(b)      TITLE OF CLASS OF SECURITIES: See cover sheets.

2(c)      CUSIP NUMBER:  See cover sheets.

Item 3.   IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(b), OR 13d-2(b),
          CHECK WHETHER THE PERSON FILING IS A:

(a) ( )   Broker or Dealer registered under section 15 of the Act

(b) ( )   Bank as defined in section 3(a) (6) of the Act

(c) ( )   Insurance Company as defined in section 3(a) (19) of the Act

(d) (x)   Investment Company registered under section 8 of the Investment
          Company Act

(e) (x)   Investment Adviser registered under section 203 of the Investment
          Advisers Act of 1940

(f) ( )   Employee Benefit Plan, Pension Fund which is subject to the provisions
          of the Employee Retirement Income Security Act of 1974 or Endowment
          Fund

(g) (x)   Parent Holding Company, in accordance with Section 240.13d
<PAGE>

                                                              Page 8 of 11 Pages
               -1 (b) (ii) (G)

(h) ( )   Group, in accordance with Section 240.13d-1 (b) (1) (ii) (H)

See Exhibit A attached hereto.

Item 4.   OWNERSHIP:

(a)       AMOUNT BENEFICIALLY OWNED: None

(b)       PERCENT OF CLASS:  None

(c)       NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS RIGHTS TO VOTE AND/OR
          DISPOSE OF SECURITIES: Not Applicable.

Item 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:  If this statement is
          being filed to report the fact that as of the date hereof the
          reporting person has ceased to be the beneficial owner of more that
          five percent of the class of securities, check the following   X .
                                                                        ---

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:  See Exhibit
          A attached hereto.

Item 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:  Not
          applicable.

Item 9.   NOTICES OF DISSOLUTION OF GROUP:  Not applicable.
<PAGE>

                                                              Page 9 of 11 Pages

Item 10.  CERTIFICATION: Each of the undersigned certifies that, to the best of
          its or his knowledge and belief, the securities referred to above were
          acquired in the ordinary course of business and were 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.
<PAGE>

                                                             Page 10 of 11 Pages

                                    SIGNATURE

          After reasonable inquiry and to the best of his knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Date:  February 10, 1996
       -----------------

                                   SPECIAL SITUATIONS FUND III, L.P.

                                   By:/S/ AUSTIN W. MARXE
                                      --------------------------
                                      Austin W. Marxe
                                      Individual General Partner

                                   MGP ADVISERS LIMITED PARTNERSHIP
                                   By: AWM Investment Company, Inc,



                                   By: /S/ AUSTIN W. MARXE
                                      --------------------------
                                        Austin W. Marxe
                                        President and Chief Executive Officer

                                    AWM INVESTMENT COMPANY, INC.



                                   By: /S/ AUSTIN W. MARXE
                                      --------------------------
                                        Austin W. Marxe
                                        President and Chief Executive Officer


                                        /S/ AUSTIN W. MARXE
                                      --------------------------
                                        AUSTIN W. MARXE
<PAGE>

                                                             Page 11 of 11 Pages




                                    EXHIBIT A


               This Exhibit explains the relationship between the Reporting
Persons.  AWM is the sole general partner of MGP, a registered investment
adviser under the Investment Advisers Act of 1940, as amended.  MGP is a general
partner of and investment adviser to the Fund.  AWM is a registered investment
adviser under the Investment Advisers Act of 1940 and also serves as the general
partner of, and investment adviser to, the Cayman Fund.  Austin W. Marxe is the
principal owner and President of AWM.




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