TEKELEC
SC 13G/A, 1998-02-10
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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<PAGE>
                                                              Page 1 of 11 Pages

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

                                  SCHEDULE 13G
                                 (Rule 13d-102)

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                              (Amendment No. 12)(1)

                                     Tekelec
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    879101103
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

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

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

     (1) 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 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  and 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).

                      Exhibit Index is Page 10 of 11 Pages

<PAGE>
                                                              Page 2 of 11 Pages
CUSIP No. 879101103               SCHEDULE 13G

================================================================================
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Tekelec-Airtronic, S.A. ("T-A")
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) [ ]
                                                                         (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY

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

     France
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

NUMBER OF              0 shares
                  --------------------------------------------------------------
SHARES            6    SHARED VOTING POWER

BENEFICIALLY           376,592(1) shares, the  voting  power of  which is shared
                       with  Jean-Claude  Asscher  who  is  the  president and
OWNED BY               majority shareholder of T-A.
                  --------------------------------------------------------------
EACH              7    SOLE DISPOSITIVE POWER

REPORTING              0 shares
                  --------------------------------------------------------------
PERSON            8    SHARED DISPOSITIVE POWER

WITH                   376,592(1)  shares, the  dispositive  power of  which is
                       shared with Jean-Claude Asscher who is the president and
                       majority shareholder of T-A.
- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     376,592(1) shares
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*   [ ]
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     1.4%
- --------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

     CO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
                                                              Page 3 of 11 Pages
CUSIP No. 879101103               SCHEDULE 13G

================================================================================
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Jean-Claude Asscher
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) [ ]
                                                                         (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY

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

     France
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

NUMBER OF              1,051,592(1) shares
                  --------------------------------------------------------------
SHARES            6    SHARED VOTING POWER

BENEFICIALLY           376,592(1) shares, the voting power with respect to
                       which is shared with Tekelec-Airtronic, S.A., except
OWNED BY               that Mr. Asscher may be deemed to share voting power
                       with Natinco, S.A. and Edouard Givel of an additional
EACH                   5,273,128(1) shares owned of record by Natinco, S.A.
                  --------------------------------------------------------------
REPORTING         7    SOLE DISPOSITIVE POWER

PERSON                 1,051,592(1) shares
                  --------------------------------------------------------------
WITH              8    SHARED DISPOSITIVE POWER

                       376,592(1) shares, the dispositive power with respect to
                       which is shared with Tekelec-Airtronic, S.A., except
                       that Mr. Asscher may be deemed to share dispositive
                       power with Natinco, S.A. and Edouard Givel of an
                       additional 5,273,128(1) shares owned of record by
                       Natinco, S.A.
- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,428,184(1) shares
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*   [X]
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     5.5%
- --------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

     IN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
                                                              Page 4 of 11 Pages
CUSIP No. 879101103               SCHEDULE 13G

================================================================================
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Natinco, S.A.
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) [ ]
                                                                         (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY

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

     Luxembourg
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

NUMBER OF              0 shares
                  --------------------------------------------------------------
SHARES            6    SHARED VOTING POWER

BENEFICIALLY           5,273,128(1) shares, the voting power of which is shared
                       with Edouard Givel, who owns substantially all of the
OWNED BY               equity interest in Natinco, S.A., except that
                       Jean-Claude Asscher may be deemed to share the voting
EACH                   power of these shares due to the fact that he has from
                       time to time acted for, and is an advisor to, Mr. Givel.
REPORTING         --------------------------------------------------------------
                  7    SOLE DISPOSITIVE POWER
PERSON
                       0 shares
WITH              --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       5,273,128(1) shares, the dispositive power of which is
                       shared with Edouard Givel, who owns substantially all
                       of the equity interest in Natinco, S.A., except that
                       Jean-Claude Asscher may be deemed to share the
                       dispositive power of these shares due to the fact
                       that he has from time to time acted for, and is an
                       advisor to, Mr. Givel.
- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     5,273,128(1) shares
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*   [ ]
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     20.2%
- --------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

     CO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>
                                                              Page 5 of 11 Pages
CUSIP No. 879101103               SCHEDULE 13G

================================================================================
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     Edouard Givel
- --------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) [ ]
                                                                         (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY

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

     Switzerland
- --------------------------------------------------------------------------------
                  5    SOLE VOTING POWER

NUMBER OF              0 shares
                  --------------------------------------------------------------
SHARES            6    SHARED VOTING POWER

BENEFICIALLY           5,273,128(1) shares, the voting power of which is shared
                       with Natinco, S.A., the record holder of these
OWNED BY               shares, except that Jean-Claude Asscher may be deemed
                       to share the voting power of these shares due to the
EACH                   fact that he has from time to time acted for, and is
                       an advisor to, Mr. Givel.
REPORTING         --------------------------------------------------------------
                  7    SOLE DISPOSITIVE POWER
PERSON
                       0 shares
WITH              --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       5,273,128(1) shares, the dispositive power of which is
                       shared with Natinco, S.A., the record holder of these
                       shares, except that Jean-Claude Asscher may be deemed
                       to share the dispositive power of these shares due to
                       the fact that he has from time to time acted for, and
                       is an advisor to, Mr. Givel.
- --------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     5,273,128(1) shares
- --------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*   [ ]
- --------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     20.2%
- --------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

     IN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
                                                              Page 6 of 11 pages

Item 1(a) Name of Issuer:

          Tekelec

Item 1(b) Address of Issuer's Principal Executive Offices:

          26580 West Agoura Road
          Calabasas, CA  91302

Item 2(a) Name of Person Filing:

          This Statement is being filed by Tekelec-Airtronic,  S.A.; Jean-Claude
          Asscher;   Natinco,   S.A.;  and  Edouard  Givel,  who  are  sometimes
          collectively  referred to as the  "Reporting  Persons."  The Reporting
          Persons may be deemed to be a "group" for  purposes of Sections  13(d)
          and  13(g)  of the  Securities  Exchange  Act of 1934  and  the  rules
          thereunder  (the  "Act"),   although  each  expressly   disclaims  any
          assertion or presumption  that it or any of the other persons on whose
          behalf this  Statement  is filed  constitutes  a "group."  Neither the
          filing of this  Statement nor the Agreement  [see Exhibit 1(2)] should
          be construed  individually or collectively to be an admission that any
          of the Reporting Persons is a member of a "group" consisting of one or
          more of the Reporting Persons or any one or more other persons.

Item 2(b) Address of Principal Business Office or, if none, Residence:

          The address of the principal business office of  Tekelec-Airtronic  is
          5, rue Carle Vernet, 92315 Sevres Cedex, France; and of Natinco,  S.A.
          is 15, rue de la Chapelle, L-1325 Luxembourg. The residence address of
          Mr.  Asscher is 34 Avenue  Raphael,  75016 Paris,  France;  and of Mr.
          Givel is 31, Chemin des Courbes, 1247 Anieres, Switzerland.

Item 2(c) Citizenship:

          Tekelec-Airtronic, S.A. and Natinco, S.A. are French and Luxembourg
          corporations, respectively. Mr. Asscher and Mr. Givel are French and
          Swiss citizens, respectively.

Item 2(d) Title of Class of Securities:

          Common Stock

Item 2(e) CUSIP Number:

          879101103

Item 3    If this statement is filed  pursuant to Rule 13d-1(b),  or 13d-2(b),
          check whether the person filing is a:

          Not applicable

<PAGE>
                                                              Page 7 of 11 pages

Item 4    Ownership:

          The following  information  with respect to the ownership of Tekelec's
          Common Stock by the  Reporting  Persons is provided as of December 31,
          1997, the last day of the year covered by this Statement.

          (a) Amount Beneficially Owned:

              See Row 9 of cover page for each Reporting Person.

              With respect to the aggregate amount of shares  beneficially owned
              by Mr. Asscher,  such amount does not include  5,273,128(1) shares
              owned  by  Natinco,   S.A.  as  to  which  Mr.  Asscher  disclaims
              beneficial ownership. This report shall not be deemed an admission
              that Mr.  Asscher  is the  beneficial  owner of such  5,273,128(1)
              shares for  purposes  of Section  13(d) or 13(g) of the Act or for
              any other purpose.

          (b) Percent of Class:

              See Row 11 of cover page for each Reporting Person.

          (c) Number of shares as to which such person has:

              (i)   sole power to vote or to direct the vote

                    See Row 5 of cover page for each Reporting Person.

              (ii) shared power to vote or to direct the vote

                    See Row 6 of cover page for each Reporting Person.

              (iii) sole power to dispose or to direct the disposition of

                    See Row 7 of cover page for each Reporting Person.

              (iv) shared power to dispose or to direct the disposition of

                    See Row 8 of cover page for each Reporting Person.

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

         Not applicable

<PAGE>
                                                              Page 8 of 11 pages

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

         To the best knowledge of each of the Reporting Persons, no person other
         than each of the  Reporting  Persons  has the right to  receive  or the
         power to direct the receipt of dividends from, or the proceeds from the
         sale of,  the  Tekelec  Common  Stock  owned  by each of the  Reporting
         Persons, respectively, except that: (a) Mr. Givel may be deemed to have
         such rights with respect to Natinco, S.A., due to the fact that he owns
         substantially all of the equity interest  therein;  and (b) Mr. Asscher
         may  be  deemed  to  have  such  rights  with  respect  to  the  shares
         beneficially owned by Tekelec-Airtronic,  S.A., due to the fact that he
         is the president and majority  shareholder thereof, and with respect to
         the shares beneficially owned by Natinco, S.A., due to the fact that he
         has from time to time acted for, and is an advisor to, Mr. Givel.

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

         Not applicable

Item 8   Identification and Classification of Members of the Group:

         See Exhibit 2.

         The Reporting Persons may be deemed to be a "group" for the purposes of
         Section 13(d) and 13(g) of the Act,  although each expressly  disclaims
         any  assertion  or  presumption  that it or the other  persons on whose
         behalf this Statement is filed constitute a "group." The filing of this
         Statement  should not be construed  to be an admission  that any of the
         Reporting  Persons is a member of a "group"  consisting  of one or more
         such persons.

Item 9   Notice of Dissolution of Group:

         Not applicable

Item 10  Certification:

         Not applicable

<PAGE>
                                                              Page 9 of 11 pages

                                    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 4, 1998


Jean-Claude Asscher
- -----------------------------------------
Jean-Claude  Asscher,  on behalf of
himself and on behalf of Tekelec-Airtronic,
S.A., as the President thereof.


Edouard Givel
- -----------------------------------------
Edouard Givel, on behalf of himself and
on behalf of Natinco,  S.A., pursuant to
a Power of Attorney [see Exhibit 3(3)].


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

(1) On 8/8/97  the Common  Stock of  Tekelec  split  2-for-1.  As a result,  the
    Reporting  Persons  received one additional  share for each share of Tekelec
    Common  Stock  held of record on  8/8/97.  All share  data set forth  herein
    reflects the stock split.

(2) Incorporated  by  reference  to Amendment  No. 2 to the  Reporting  Persons'
    Schedule 13G filed with the Commission on February 16, 1988.

(3) Incorporated  by  reference to Amendment  No. 11 to the  Reporting  Persons'
    Schedule 13G filed with the Commission on February 13, 1997.

<PAGE>
                                                             Page 10 of 11 pages

                                  EXHIBIT INDEX

Exhibit Number  Exhibit                                      Page
- --------------  -------------------------------------------  -------------------

1               Agreement to File Joint Statement            Page 9 of 11 pages
                on Schedule 13G*

2               Identification of the Reporting              Page 11 of 11 pages
                Persons

3               Procuration [Power of Attorney**]            Page 9 of 11 pages

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

*  Incorporated by reference to Amendment No. 2 to the Reporting Persons'
   Schedule 13G filed with the Commission on February 16, 1988.

** Incorporated by reference to Amendment No. 11 to the Reporting Persons'
   Schedule 13G filed with the Commission on February 13, 1997.


<PAGE>
                                                             Page 11 of 11 pages

                                    Exhibit 2

The Reporting Persons are identified below:

Tekelec-Airtronic, S.A. is a French corporation.

Natinco, S.A. is a Luxembourg corporation.

Jean-Claude  Asscher  is  a  French  citizen  and  the  president  and  majority
shareholder of Tekelec-Airtronic, S.A.

Edouard Givel is a Swiss citizen and the owner of  substantially  all the equity
interest of Natinco, S.A.


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