UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 15)
SIGMA-ALDRICH CORPORATION
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(Name of Issuer)
Class A Common Stock
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(Title of Class of Securities)
826552 10 1
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(CUSIP Number)
December 31, 1999
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(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:
[ ] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[X] Rule 13d-1(d)
* 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 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 3 Pages
<PAGE>
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CUSIP No. 826552 10 1
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1 NAME OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Alfred R. Bader (###-##-####)
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
(a)[ ]
(b)[ ]
N/A
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
United States
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5 SOLE VOTING POWER
NUMBER OF 5,274,260
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SHARES 6 SHARED VOTING POWER
BENEFICIALLY -0-
OWNED BY -------------------------------------------------------------
7 SOLE DISPOSITIVE POWER
EACH
5,274,260
REPORTING
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PERSON 8 SHARED DISPOSITIVE POWER
WITH -0-
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,274,260
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
SHARES (SEE INSTRUCTIONS) [ ]
N/A
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.23%*
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12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IN
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* Based on an aggregate of 100,893,818 shares outstanding as of October 31,
1999.
Page 2 of 3 Pages
<PAGE>
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CUSIP No. 826552 10 1
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This amendment No. 15 to Schedule 13G with regard to Sigma-Aldrich
Corporation is being filed on behalf of the undersigned to amend Item 4 of the
originally filed Schedule 13G. Except as expressly stated herein, there have
been no material changes in the information set forth in the Schedule 13G.
Item 4. Ownership
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Keeley Asset Management Corp.
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(a) Amount Beneficially Owned: 5,274,260
(b) Percent of Class: 5.23%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 5,274,260
(ii) shared power to vote or to direct the vote: -0-
(iii)sole power to dispose or to direct the disposition of:
5,274,260
(iv) shared power to dispose or to direct the disposition
of: -0-
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.
Dated this 1st day of February, 2000.
/s/ Alfred R. Bader
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Alfred R. Bader
Page 3 of 3 Pages
