<PAGE>
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
AMENDMENT NO. 1
TO
SCHEDULE 13D
Under the Securities Exchange Act of 1934
Bigmar, Inc.
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(Name of Issuer)
Common Stock, par value $.001
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(Title of Class of Securities)
089893101
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(CUSIP Number)
G. Rovelli
Chemholding SA
Via Pian Scairolo 6
CH-6917 Barbengo
Switzerland
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(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)
Copies to:
Neil Novikoff
Willkie Farr & Gallagher
153 East 53rd Street
New York, NY 10022
(212) 821-8000
May 2, 1997
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(Date of Event which Requires
Filing of this Schedule)
If the filing person has previously filed a statement on
Schedule 13G to report the acquisition which is the subject of this
Schedule 13D, and is filing this schedule because of Rule 13d-1(b)(3)
or (4), check the following:
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SCHEDULE 13D
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CUSIP No. 089893101 Page 2 of 8 Pages
-------------- -------- ------
- ------------------------- -------------------------------------
- ---- ---------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Chemholding SA
- ---- ---------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]
(b) [X]
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3 SEC USE ONLY
- ---- ---------------------------------------------------------------------------
4 SOURCE OF FUNDS*
WC
- ---- ---------------------------------------------------------------------------
5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
2(d) or 2(e)
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6 CITIZENSHIP OR PLACE OF ORGANIZATION
Switzerland
- -------------- --------- -------------------------------------------------------
7 SOLE VOTING POWER
0 shares of Common Stock
--------- -------------------------------------------------------
NUMBER OF 8 SHARED VOTING POWER
SHARES
BENEFICIALLY 0 shares of Common Stock
OWNED BY --------- -------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH 0 shares of Common Stock
--------- -------------------------------------------------------
10 SHARED DISPOSITIVE POWER
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
- ---- ---------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0%
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14 TYPE OF REPORTING PERSON*
CO
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*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
SCHEDULE 13D
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CUSIP No. 089893101 Page 3 of 8 Pages
-------------------- ------ -----
- ------------------------------- ---------------------------------------
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1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Maria Pia Melera
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]
(b) [X]
- ---- ---------------------------------------------------------------------------
3 SEC USE ONLY
- ---- ---------------------------------------------------------------------------
4 SOURCE OF FUNDS*
PF
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5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
2(d) or 2(e)
- ---- ---------------------------------------------------------------------------
6 CITIZENSHIP OR PLACE OF ORGANIZATION
Switzerland
- -------------- --------- -------------------------------------------------------
7 SOLE VOTING POWER
0 shares of Common Stock
--------- -------------------------------------------------------
NUMBER OF 8 SHARED VOTING POWER
SHARES
BENEFICIALLY 0 shares of Common Stock
OWNED BY --------- -------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH 0 shares of Common Stock
--------- -------------------------------------------------------
10 SHARED DISPOSITIVE POWER
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
- ---- ---------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0%
- ---- ---------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*
IN
- ---- ---------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
SCHEDULE 13D
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CUSIP No. 089893101 Page 4 of 8 Pages
-------------------- ------ -----
- ------------------------------- ---------------------------------------
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1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Jan Jacob van Troostenburg
- ---- ---------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]
(b) [X]
- ---- ---------------------------------------------------------------------------
3 SEC USE ONLY
- ---- ---------------------------------------------------------------------------
4 SOURCE OF FUNDS*
PF
- ---- ---------------------------------------------------------------------------
5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
2(d) or 2(e)
- ---- ---------------------------------------------------------------------------
6 CITIZENSHIP OR PLACE OF ORGANIZATION
Switzerland
- -------------- --------- -------------------------------------------------------
7 SOLE VOTING POWER
0 shares of Common Stock
--------- -------------------------------------------------------
NUMBER OF 8 SHARED VOTING POWER
SHARES
BENEFICIALLY 0 shares of Common Stock
OWNED BY --------- -------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH 0 shares of Common Stock
--------- -------------------------------------------------------
10 SHARED DISPOSITIVE POWER
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
- ---- ---------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0%
- ---- ---------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*
IN
- ---- ---------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
SCHEDULE 13D
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CUSIP No. 089893101 Page 5 of 8 Pages
--------------------- ----- -----
- -------------------------------- ------------------------------------
- ---- ---------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Pierangelo Ghirlanda
- ---- ---------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]
(b) [X]
- ---- ---------------------------------------------------------------------------
3 SEC USE ONLY
- ---- ---------------------------------------------------------------------------
4 SOURCE OF FUNDS*
PF
- ---- ---------------------------------------------------------------------------
5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
2(d) or 2(e)
- ---- ---------------------------------------------------------------------------
6 CITIZENSHIP OR PLACE OF ORGANIZATION
Switzerland
- -------------- --------- -------------------------------------------------------
7 SOLE VOTING POWER
0 shares of Common Stock
--------- -------------------------------------------------------
NUMBER OF 8 SHARED VOTING POWER
SHARES
BENEFICIALLY 0 shares of Common Stock
OWNED BY --------- -------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH 0 shares of Common Stock
--------- -------------------------------------------------------
10 SHARED DISPOSITIVE POWER
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
- ---- ---------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0%
- ---- ---------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*
IN
- ---- ---------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
SCHEDULE 13D
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CUSIP No. 089893101 Page 6 of 8 Pages
-------------------- ----- -----
- ------------------------------- ------------------------------------
- ---- ---------------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Giovanni Pelli
- ---- ---------------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ]
(b) [X]
- ---- ---------------------------------------------------------------------------
3 SEC USE ONLY
- ---- ---------------------------------------------------------------------------
4 SOURCE OF FUNDS*
PF
- ---- ---------------------------------------------------------------------------
5 CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
2(d) or 2(e)
- ---- ---------------------------------------------------------------------------
6 CITIZENSHIP OR PLACE OF ORGANIZATION
Switzerland
- -------------- --------- -------------------------------------------------------
7 SOLE VOTING POWER
0 shares of Common Stock
--------- -------------------------------------------------------
NUMBER OF 8 SHARED VOTING POWER
SHARES
BENEFICIALLY 0 shares of Common Stock
OWNED BY --------- -------------------------------------------------------
EACH 9 SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH 0 shares of Common Stock
--------- -------------------------------------------------------
10 SHARED DISPOSITIVE POWER
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH PERSON
0 shares of Common Stock
- ---- ---------------------------------------------------------------------------
12 CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
- ---- ---------------------------------------------------------------------------
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0%
- ---- ---------------------------------------------------------------------------
14 TYPE OF REPORTING PERSON*
IN
- ---- ---------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT
<PAGE>
This statement amends and supplements the information set forth in the
Schedule 13D filed by the Reporting Entities (as defined therein) with the
Securities and Exchange Commission on March 17, 1997 and constitutes Amendment
No. 1 to the Schedule 13D. Capitalized terms used herein without definition
shall have the meaning assigned to such terms in the Schedule 13D.
Item 4. Purpose of Transaction.
Item 4 is revised and amended by inserting the following paragraph in
place of the second and third paragraphs of the Item.
On March 27, 1997, the Reporting Entities entered into an agreement for
the sale of all their shares of Common Stock to Mr. John Tramontana, Chairman
and President of the Company. The sale of the Common Stock was subject to
several closing conditions, which were satisfied on May 2, 1997. The terms of
the sale agreement are disclosed in more detail in Item 5(c).
Item 5. Interest in Securities of the Issuer.
Item 5(c) is revised and amended by inserting the following in place of
the current paragraph of such Item.
(c) On March 27, 1997, the Reporting Entities entered into an agreement
for the sale of all their shares of Common Stock (1,293,663 shares) to Mr. John
Tramontana, Chairman and President of the Company. The sale of the Common Stock
did not become effective until May 2, 1997, following satisfaction of all
closing conditions. The shares held by the Reporting Entities (other than
Chemholding S.A.) were sold at a price equal to 9.3253267 Swiss francs per
share, and the shares held by Chemholding S.A. were sold at a price equal to
0.8163766 Swiss francs per share. The shares were sold in a privately negotiated
transaction in Switzerland, and not through any securities exchange.
<PAGE>
SIGNATURES
After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.
Dated: May 2, 1997 Chemholding S.A.
By:/s/ A. Melera
A. Melera
Authorized Signatory
Dated: May 2, 1997
/s/ Jan Jacob van Troostenburg
Jan Jacob van Troostenburg
Dated: May 2, 1997
/s/ Maria Pia Melera
Maria Pia Melera
Dated: May 2, 1997
/s/ Pierangelo Ghirlanda
Pierangelo Ghirlanda
Dated: May 2, 1997
/s/ Giovanni Pelli
Giovanni Pelli
