UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 1 )*
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Carbo Ceramics Inc.
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(Name of Issuer)
Common Stock
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(Title of Class of Securities)
140781105
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(CUSIP Number)
December 31, 2004
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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:
[x] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] 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 the
disclosures provided in a prior cover 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).
CUSIP No. 140781105 13G Page 2 of 5 Pages
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Columbia Acorn Trust
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
Not Applicable (a) [ ]
(b) [ ]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Massachusetts
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5 SOLE VOTING POWER
NUMBER OF None
SHARES ----------------------------------------------------------
6 SHARED VOTING POWER
BENEFICIALLY 771,000
OWNED BY ----------------------------------------------------------
7 SOLE DISPOSITIVE POWER
EACH None
REPORTING ----------------------------------------------------------
8 SHARED DISPOSITIVE POWER
PERSON WITH 771,000
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
771,000
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
Not Applicable [ ]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
4.8%
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12 TYPE OF REPORTING PERSON*
IA
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Item 1(a) Name of Issuer:
Carbo Ceramics Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
6565 MacArthur Boulevard
Suite 1050
Irving, Texas 75039
Item 2(a) Name of Person Filing:
Columbia Acorn Trust ("Acorn")
Item 2(b) Address of Principal Business Office:
Acorn is located at:
227 West Monroe Street, Suite 3000
Chicago, Illinois 60606
Item 2(c) Citizenship:
Acorn is a Massachusetts business trust.
Item 2(d) Title of Class of Securities:
Common Stock
Item 2(e) CUSIP Number:
140781105
Item 3 Type of Person:
(d) Acorn is an Investment Company under section 8 of
the Investment Company Act.
Item 4 Ownership (at December 31, 2004):
(a) Amount owned "beneficially" within the meaning of
rule 13d-3:
771,000
(b) Percent of class:
4.8% (based on 15,975,762 shares outstanding as of
October 26, 2004)
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the
vote: none
(ii) shared power to vote or to direct the
vote: 771,000
(iii) sole power to dispose or to direct the
disposition of: none
(iv) shared power to dispose or to direct
disposition of: 771,000
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 than 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:
Not Applicable
Item 8 Identification and Classification of Members of the Group:
Not Applicable
Item 9 Notice of Dissolution of Group:
Not Applicable
Item 10 Certification:
By signing below I certify that, to the best
of my knowledge and belief, the securities referred
to above were acquired and are held in the ordinary
course of business and were not acquired and are not
held for the purpose of or with the effect of
changing or influencing the control of the issuer of
the securities and were not acquired and are not held
in connection with or as a participant in any
transaction having that purpose or effect.
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 14, 2005
COLUMBIA ACORN TRUST
By: /s/ Bruce H. Lauer
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Bruce H. Lauer
Vice President, Treasurer and
Secretary