<PAGE>
------------------------------
OMB APPROVAL
------------------------------
OMBA Number: 3235-0145
Expires: October 31, 1994
Estimated average burden
hours per response . . . 14.90
------------------------------
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )*
AES China Generating Co. Ltd.
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock Class A
- --------------------------------------------------------------------------------
(Title of Class of Securities)
G0109610
-------------------------------------
(CUSIP Number)
*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).
<PAGE>
- ----------------------- ---------------------
CUSIP NO. G0109610 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) [_]
Not Applicable (b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF None
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
810,000
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING None
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
810,000
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
810,000
- ------------------------------------------------------------------------------
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
5.18%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IA
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. G0109610 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) [_]
Not Applicable (b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
Delaware
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF None
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
810,000
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING None
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
810,000
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
810,000
- ------------------------------------------------------------------------------
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
5.18%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
CO
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ----------------------- ---------------------
CUSIP NO. G0109610 13G PAGE 4 OF 8 PAGES
- ----------------------- ---------------------
- ------------------------------------------------------------------------------
NAME OF REPORTING PERSON
1 S.S, or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Ralph Wanger
- ------------------------------------------------------------------------------
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
2 (a) [_]
Not Applicable (b) [_]
- ------------------------------------------------------------------------------
SEC USE ONLY
3
- ------------------------------------------------------------------------------
CITIZENSHIP OR PLACE OF ORGANIZATION
4
U.S.A
- ------------------------------------------------------------------------------
SOLE VOTING POWER
5
NUMBER OF None
SHARES -----------------------------------------------------------
SHARED VOTING POWER
BENEFICIALLY 6
810,000
OWNED BY
-----------------------------------------------------------
EACH SOLE DISPOSITIVE POWER
7
REPORTING None
PERSON -----------------------------------------------------------
SHARED DISPOSITIVE POWER
WITH 8
810,000
- ------------------------------------------------------------------------------
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
9
810,000
- ------------------------------------------------------------------------------
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
5.18%
- ------------------------------------------------------------------------------
TYPE OF REPORTING PERSON*
12
IN
- ------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
Item 1(a) Name of Issuer:
AES China Generating Co. Ltd.
Item 1(b) Address of Issuer's Principal Executive Offices:
Allied Capital Resources Building
9th Floor
32-38 Ice House Street
Central Hong Kong
Item 2(a) Name of Person Filing:
Wanger Asset Management, L.P. ("WAM");
Wanger Asset Management Ltd., the general partner of WAM
("WAM LTD.");
Ralph Wanger ("Wanger")
Item 2(b) Address of Principal Business Office:
WAM, WAM LTD. and Wanger are all located at:
227 West Monroe Street, Suite 3000
Chicago, Illinois 60606
Item 2(c) Citizenship:
WAM is a Delaware limited partnership.
WAM LTD. is a Delaware corporation.
Wanger is a U.S. citizen.
Item 2(d) Title of Class of Securities:
Common Stock, Class A
Item 2(e) CUSIP Number:
G0109106
Item 3 Type of Person:
(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; Wanger is the
principal stockholder of the General Partner.
Page 5 of 8 Pages
<PAGE>
Item 4 Ownership (at December 31, 1996):
(a) Amount owned "beneficially" within the meaning of rule
13d-3:
810,000 shares
(b) Percent of class:
5.18%
(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:
810,000
(iii) sole power to dispose or to direct the
disposition of: none
(iv) shared power to dispose or to direct
disposition of: 810,000
WAM serves as investment adviser to Acorn Investment
Trust, Series Designated Acorn Fund (the "Trust"). Various
of WAM's limited partners and employees are also officers
and trustees of the Trust, but WAM does not consider the
Trust to be controlled by such persons. Although the Trust
is not controlled by WAM, pursuant to rule 13d-3(a) the
810,000 shares beneficially owned by the Trust, with
respect to which the Trust has delegated to WAM shared
voting power and shared dispositive power, are considered
to be shares beneficially owned by WAM by reason of such
delegated powers. In addition to the shares beneficially
owned by the Trust, other clients of WAM may own shares
which are not included in the aggregate number of shares
reported herein because WAM does not have or share voting
or investment power over those shares.
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. Persons other than WAM are
entitled to receive all dividends from, and proceeds from
the sale of, those shares.
Page 6 of 8 Pages
<PAGE>
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 in the
ordinary course of business and were not acquired for the purpose
of and do not have the effect of changing or influencing the
control of the issuer of such securities and were not acquired in
connection with or as a participant in any transaction having
such purpose or effect.
Page 7 of 8 pages
<PAGE>
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, 1997
The undersigned corporation, on the date above written,
agrees and consents to the joint filing on its behalf of
this Schedule 13G in connection with its beneficial
ownership of the security reported herein.
WANGER ASSET MANAGEMENT, LTD.
for itself and as general partner of
WANGER ASSET MANAGEMENT, L.P.
By: /s/ Bruce H. Lauer
-----------------------------
Bruce H. Lauer
Vice President
The undersigned individual, on the date above written,
agrees and consents to the joint filing on his behalf of
this Schedule 13G in connection with his beneficial
ownership of the security reported herein.
RALPH WANGER
/s/ Ralph Wanger
--------------------------------
Page 8 of 8 pages
