<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. ____)*
COMMONWEALTH BANCORP, INC.
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock
- --------------------------------------------------------------------------------
(Title of Class of Securities)
20268X102
- --------------------------------------------------------------------------------
(CUSIP Number)
(Date of Event Which Requires Filing of this Statement)
*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).
Schedule is filed pursuant to Rule 13d-1(b).
Page 1 of 8 pages
<PAGE>
- ------------------- -----------------
CUSIP No. 20268X102 13G Page 2 of 8 Pages
- ------------------- -----------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Wanger Asset Management, L.P. 36-3820584
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
Not Applicable
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF None
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
745,600
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING None
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
745,600
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
745,600
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
Not Applicable
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.24%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IA
- ------------------------------------------------------------------------------
* SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
- ------------------- -----------------
CUSIP No. 20268X102 13G Page 3 of 8 Pages
- ------------------- -----------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Wanger Asset Management, Ltd.
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
Not Applicable
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF None
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
745,600
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING None
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
745,600
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
745,600
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
Not Applicable
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
6.24%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
CO
- ------------------------------------------------------------------------------
* SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
- ------------------- -----------------
CUSIP No. 20268X102 13G Page 4 of 8 Pages
- ------------------- ------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Acorn Investment Trust
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
(b) [_]
Not Applicable
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Massachusetts
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF None
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
702,000
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING None
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
702,000
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
702,000
- ------------------------------------------------------------------------------
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
[_]
Not Applicable
- ------------------------------------------------------------------------------
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
5.88%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IV
- ------------------------------------------------------------------------------
* SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
Item 1(a) Name of Issuer:
COMMONWEALTH BANCORP, INC.
(b) Address of Issuer's Principal Executive Offices:
Commonwealth Bank Plaza
2 West Lafayette Street
Norristown, PA 19401
Item 2(a): Name of Person Filing:
Wanger Asset Management, L.P. ("WAM")
Wanger Asset Management Ltd., the general partner of WAM ("WAM LTD.")
Acorn Investment Trust ("Acorn")
(b) Address of Principal Business Office or, if none, Residence:
WAM, WAM LTD. and Acorn are all located at:
227 West Monroe Street, Suite 3000
Chicago, Illinois 60606
(c) Citizenship:
WAM is a Delaware limited partnership; WAM LTD. is a Delaware
corporation; and Acorn is a Massachusetts business trust.
(d) Title of Class of Securities:
Common Stock
(e) CUSIP Number:
20268X102
Item 3: Type of Person:
(d) Acorn is an Investment Company under section 8 of the Investment
Company Act.
(e) WAM is an Investment Adviser registered under section 203 of the
Investment Advisers Act of 1940; WAM LTD. is the General Partner
of the Investment Adviser.
Page 5 of 8 Pages
<PAGE>
Item 4: Ownership (at December 31, 1999):
(a) Amount owned "beneficially" within the meaning of
rule 13d-3:
745,600
(b) Percent of class:
6.24%
(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:
745,600
(iii) sole power to dispose or to direct the disposition of:
none
(iv) shared power to dispose or to direct the disposition of:
745,600
Item 5 Ownership of Five Percent or Less of a Class:
Not applicable.
Item 6 Ownership of More than Five Percent on Behalf of Another Person:
The shares reported herein have been acquired on behalf of
discretionary clients of WAM, including Acorn. Persons other than WAM
and WAM LTD. are entitled to receive all dividends from, and proceeds
from the sale of, those shares. Acorn is the only such person known
to be entitled to all dividends from, and all proceeds from the sale
of, shares reported herein to the extent of more than 5% of the
class.
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.
Page 6 of 8 Pages
<PAGE>
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.
Page 7 of 8 Pages