<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>w53236sc13da.txt
<DESCRIPTION>SCHEDULE 13D/A3
<TEXT>
<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                              --------------------

                                 SCHEDULE 13D/A3
                    Under the Securities Exchange Act of 1934


                            P. H. Glatfelter Company
                              --------------------
                                 Name of Issuer

                     Common Stock, par value $.01 per share
                     --------------------------------------
                         (Title of Class of Securities)

                                   377316 10 4
                              --------------------
                                  CUSIP Number

               Howard I. Verbofsky, General Counsel, PNC Advisors
                         PNC Bank, National Association

                   1600 Market Street, Philadelphia, PA 19103
                                  215-585-6814
                              --------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 August 17, 2001
                              --------------------
                          (Date of Event which Requires
                            Filing of this Statement)

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(e), (f) or (g), check the following box [ ].

*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).
<PAGE>   2
CUSIP No. 377316 10 4                                         Page 2 of 20 pages



1.       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         P. H. Glatfelter Family Shareholders' Voting Trust established pursuant
         to agreement dated as of July 1, 1993

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                          (a)[ ]
                                                                          (b)[x]
3.       SEC USE ONLY

4.       SOURCE OF FUNDS

                                    00

5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) or 2(e)
                                                                             [ ]
6.       CITIZENSHIP OR PLACE OF ORGANIZATION

                                    Pennsylvania

                           7.       SOLE VOTING POWER

   NUMBER OF                        12,515,675
      SHARES               8.       SHARED VOTING POWER
BENEFICIALLY
    OWNED BY                        0
        EACH               9.       SOLE DISPOSITIVE POWER
   REPORTING
      PERSON                        0
        WITH               10.      SHARED DISPOSITIVE POWER

                                    0

11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                   12,515,675

12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                             [ ]

13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                      29.4%

14.      TYPE OF REPORTING PERSON

                                       00
<PAGE>   3
CUSIP No. 377316 10 4                                         Page 3 of 20 pages



1.       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Voting Trustee of P. H. Glatfelter Family Shareholders' Voting Trust
            established pursuant to agreement dated as of July 1, 1993

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                          (a)[ ]
                                                                          (b)[x]
3.       SEC USE ONLY

4.       SOURCE OF FUNDS

                                    00

5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) or 2(e)
                                                                             [ ]
6.       CITIZENSHIP OR PLACE OF ORGANIZATION

                                    Pennsylvania

                           7.       SOLE VOTING POWER

   NUMBER OF                        12,515,675
      SHARES               8.       SHARED VOTING POWER
BENEFICIALLY
    OWNED BY                        0
        EACH               9.       SOLE DISPOSITIVE POWER
   REPORTING
      PERSON                        0
        WITH               10.      SHARED DISPOSITIVE POWER

                                    0

11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                   12,515,675

12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                             [ ]

13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                      29.4%

14.      TYPE OF REPORTING PERSON

                                       00
<PAGE>   4
CUSIP No. 377316 10 4                                         Page 4 of 20 pages


         This Amendment No. 3, dated September 13, 2001, amends the Schedule 13D
dated July 1, 1993 and filed on July 2, 1993 (File No. 5-12158) by the P. H.
Glatfelter Family Shareholders' Voting Trust established pursuant to an
agreement dated as of July 1, 1993, and the trustees of the P. H. Glatfelter
Family Shareholders' Voting Trust established pursuant to the agreement (the
"Initial 13D"), as amended by Amendment No. 1, dated and filed June 8, 1999, and
Amendment No. 2, dated and filed July 10, 2000.

ITEM 1.  SECURITY AND ISSUER

         This statement relates to the Common Stock, par value $.01 per share
(the "Common Stock"), of P. H. Glatfelter Company, a Pennsylvania corporation
(the "Company"), which has its principal executive offices at 96 South George
Street, Suite 500, York, Pennsylvania 17401.

ITEM 2.  IDENTITY AND BACKGROUND

         This statement is being filed by the P. H. Glatfelter Family
Shareholders' Voting Trust (the "Voting Trust"), which was established pursuant
to an agreement dated as of July 1, 1993 (the "Trust Agreement"), and the body
of trustees for the Voting Trust (the "Voting Trustee"). Pursuant to the Trust
Agreement, a copy of which was filed as an exhibit to the Initial 13D, PNC Bank,
National Association, as trustee or co-trustee of fiduciary trusts (the
"Fiduciary Trusts"), together with any co-trustees thereof, has ceded to the
Voting Trustee voting power over the shares of Common Stock held of record by
the Fiduciary Trusts. There are currently 85 Fiduciary Trusts.

         The Fiduciary Trusts include many of the fiduciary trusts that have
been established by and for the benefit of the lineal descendants by birth of
Philip H. Glatfelter or spouses of such descendants (the "Family Members"). The
Family Members who are settlors or beneficiaries of the Fiduciary Trusts are
divided into five lineal groups (the "Groups") for the purpose of selecting
those persons who constitute the Voting Trustee. (See Sections 1 and 6 of Trust
Agreement.)

         The Voting Trustee has sole voting power over the shares of Common
Stock and any other voting securities that may be held in the Voting Trust from
time to time (the "Trust Shares"). (See Sections 2 and 10 of Trust Agreement.)
The persons who presently constitute the Voting Trustee are: PNC Bank, National
Association (the "Bank Constituent"), and the following five Family Members,
each of whom represents a Group (each a "Group Constituent" and, together with
the Bank Constituent, the "Constituents"). The names, residence or business
addresses and principal occupations (including the addresses of any employers
not otherwise provided) of the Group Constituents are set forth below:

<TABLE>
<CAPTION>
                                         Residence or
Names                                    Business Addresses                    Principal Occupations
-----                                    ------------------                    ---------------------
<S>                                      <C>                                   <C>
Katherine G. Costello                    195 Saddle Hill Road                  Homemaker
                                         Spring Grove, PA 17362
</TABLE>
<PAGE>   5
CUSIP No. 377316 10 4                                         Page 5 of 20 pages



<TABLE>
<CAPTION>
                                         Residence or
Names                                    Business Addresses                    Principal Occupations
-----                                    ------------------                    ---------------------
<S>                                      <C>                                   <C>
William M. Eyster, II                    2002 Rosewood Lane                    Retired
                                         York, PA 17403

Elizabeth Glatfelter                     9161 Greentree Road                   Homemaker
                                         Philadelphia, PA 19118

Irene G. Fegley                          73 Lake Road                          Homemaker
                                         Manhasset, NY 11030

Susan M. G. Wilson                       6569 Kopp Road                        Homemaker
                                         Spring Grove, PA 17362
</TABLE>

         Katherine G. Costello was elected as a Group Constituent on April 5,
1996 and replaced William L. Glatfelter III, who resigned on March 20, 1996.
William M. Eyster, II is one of the initial Group Constituents named in the
Trust Agreement. Elizabeth Glatfelter was elected as a Group Constituent on
January 19, 1999 and replaced Patricia G. Foulkrod, whose term expired on
December 31, 1998. Irene G. Fegley was elected as a Group Constituent on January
30, 2001 and replaced H. Clinton Vaughan, whose term expired on December 31,
2000. Susan M. G. Wilson was elected as a Group Constituent on June 5, 2000 and
replaced Philip H. Glatfelter IV, who resigned by letter dated May 10, 2000.

         The Bank Constituent is a national banking association, with community
banking offices in Pennsylvania, Florida, New Jersey, Kentucky, Ohio and
Indiana, which provides retail banking, corporate banking, investment management
and trust, and investment banking services. The business address of the Bank
Constituent is 1600 Market Street, Philadelphia, PA 19103, Attn: Howard I.
Verbofsky, General Counsel, PNC Advisors.

         Each of the Group Constituents is a United States citizen. The Bank
Constituent is a wholly-owned, second-tier subsidiary of The PNC Financial
Services Group, Inc., a Pennsylvania corporation.(1)

         The names and positions of the executive officers of PNC Bank, National
Association are set forth below:

<TABLE>
<CAPTION>
Names                                                       Positions
-----                                                       ---------
<S>                                                         <C>
James E. Rohr                                               Chairman, President and Chief Executive Officer
</TABLE>

------------------
(1)  A first-tier subsidiary of The PNC Financial Services Group, Inc., PNC
     Bancorp, Inc., a Delaware corporation, is the direct parent corporation of
     PNC Bank, National Association.
<PAGE>   6
CUSIP No. 377316 10 4                                         Page 6 of 20 pages



<TABLE>
<CAPTION>
Names                                        Positions
-----                                        ---------
<S>                                          <C>
Walter E. Gregg, Jr.                         Vice Chairman

Ralph S. Michael, III                        Group Executive, Executive Vice President, PNC
                                             Advisors, and PNC Capital Markets

Joseph C. Guyaux                             Group Executive, Executive Vice President, Regional
                                             Community Banking

Thomas K. Whitford                           Group Executive, Executive Vice President, PNC
                                             Strategic Planning

Robert L. Haunschild                         Senior Vice President and Chief Financial Officer

Thomas E. Paisley, III                       Senior Vice President, Corporate Credit Policy

Helen P. Pudlin                              Senior Vice President and General Counsel

Samuel R. Patterson                          Controller

Timothy G. Shack                             Group Executive, Executive Vice President and Chief
                                             Information Officer
</TABLE>

The principal occupation of each of the foregoing executive officers of PNC
Bank, National Association is officer of PNC Bank, National Association or
officer of The PNC Financial Services Group, Inc. The business address of each
such executive officer is c/o The PNC Financial Services Group, Inc., One PNC
Plaza, 249 Fifth Avenue, Pittsburgh, PA 15222-2707, and each such executive
officer is a United States citizen.

         The names, business addresses and principal occupations of the
directors of PNC Bank, National Association are set forth below:

<TABLE>
<CAPTION>
Names                                Business Addresses                                 Principal Occupations
-----                                ------------------                                 ---------------------
<S>                                  <C>                                                <C>
Paul W. Chellgren                    Ashland Inc.                                       Chairman and Chief
                                     P.O. Box 391                                       Executive Officer
                                     Covington, KY 41012-0391
</TABLE>
<PAGE>   7
CUSIP No. 377316 10 4                                         Page 7 of 20 pages


<TABLE>
<CAPTION>
Names                                Business Addresses                                 Principal Occupations
-----                                ------------------                                 ---------------------
<S>                                  <C>                                                <C>
Robert N. Clay                       Clay Holding Company                               President and Chief
                                     Three Chimneys Farm                                Executive Officer
                                     P.O. Box 114
                                     Midway, KY 40347

George A. Davidson, Jr.              Dominion Resources, Inc.                           Retired Chairman
                                     Dominion Tower
                                     625 Liberty Avenue, 22nd Floor
                                     Pittsburgh, PA 15222-3199

David F. Girard-diCarlo              Blank Rome Comisky & McCauley LLP                  Co-Chairman and Managing
                                     One Logan Square                                   Partner
                                     Philadelphia, PA 19103-6998

Walter E. Gregg, Jr.                 The PNC Financial Services Group, Inc.             Vice Chairman
                                     One PNC Plaza, 30th Floor
                                     249 Fifth Avenue
                                     Pittsburgh, PA 15222-2707

William R. Johnson                   H. J. Heinz Company                                Chairman, President and
                                     World Headquarters                                 Chief Executive Officer
                                     P.O. Box 57
                                     Pittsburgh, PA 15230-0057

Bruce C. Lindsay                     Brind-Lindsay & Co., Inc.                          Chairman and Managing
                                     1926 Arch Street                                   Director
                                     Philadelphia, PA 19103-1444

W. Craig McClelland                  Union Camp Corporation                             Retired Chairman and Chief
                                     50 Tice Boulevard                                  Executive Officer
                                     Woodcliff Lake, NJ 07675

Thomas H. O'Brien                    The PNC Financial Services Group, Inc.             Retired Chairman
                                     One PNC Plaza, 2nd Floor
                                     249 Fifth Avenue
                                     Pittsburgh, PA 15222-2707

Jane G. Pepper                       Pennsylvania Horticultural Society                 President
                                     100 N. 20th Street - 5th Floor
                                     Philadelphia, PA 19103-1495
</TABLE>
<PAGE>   8
CUSIP No. 377316 10 4                                         Page 8 of 20 pages



<TABLE>
<CAPTION>
Names                                Business Addresses                                 Principal Occupations
-----                                ------------------                                 ---------------------
<S>                                  <C>                                                <C>
James E. Rohr                        The PNC Financial Services Group, Inc.             Chairman, President and
                                     One PNC Plaza, 30th Floor                          Chief Executive Officer
                                     249 Fifth Avenue
                                     Pittsburgh, PA 15222-2707

Lorene K. Steffes                    IBM Corporation                                    Vice President Software
                                     Westinghouse Building                              Services and Software
                                     11 Stanwix Street, 23rd Floor                      Group Pittsburgh Site
                                     Pittsburgh, PA 15222                               Executive

Dennis F. Strigl                     Verizon Wireless Services, LLC                     President and Chief
                                     180 Washington Valley Road                         Executive Officer
                                     Bedminster, NJ 07921

Thomas J. Usher                      USX Corporation                                    Chairman and Chief
                                     61st Floor                                         Executive Officer
                                     600 Grant Street
                                     Pittsburgh, PA 15219-4776

Milton A. Washington                 AHRCO                                              President and Chief
                                     5604 Baum Boulevard                                Executive Officer
                                     Pittsburgh, PA 15206

Helge H. Wehmeier                    Bayer Corporation                                  President and Chief
                                     100 Bayer Road, Building 4                         Executive Officer
                                     Pittsburgh, PA 15205-9741
</TABLE>

Each of the foregoing directors is a United States citizen with the exception of
Mr. Wehmeier. He is a citizen of Germany. Mr. Wehmeier serves as a director of
PNC Bank, National Association pursuant to a waiver of the citizenship
requirement granted by the Office of the Comptroller of the Currency.

         The PNC Financial Services Group, Inc. is the ultimate parent
corporation of the Bank Constituent. The PNC Financial Services Group, Inc. is
one of the largest diversified financial services organizations in the United
States. Its major businesses include Regional Community Banking, Corporate
Banking, Private Banking, Secured Lending, Asset Management and Mutual Fund
Servicing. The principal business address of The PNC Financial Services Group,
Inc. is One PNC Plaza, 249 Fifth Avenue, Pittsburgh, PA 15222-2707.
<PAGE>   9
CUSIP No. 377316 10 4                                        Page 9 of 20 pages

         The names and positions with The PNC Financial Services Group, Inc. of
the executive officers of The PNC Financial Services Group, Inc. are set forth
below(2):

<TABLE>
<CAPTION>
Names                                   Positions
-----                                   ---------
<S>                                     <C>
James E. Rohr                           Chairman, President and Chief Executive Officer

Walter E. Gregg, Jr.                    Vice Chairman

Ralph S. Michael, III                   Group Executive, Executive Vice President, PNC Advisors and PNC
                                        Capital Markets

Joseph C. Guyaux                        Group Executive, Executive Vice President, Regional Community
                                        Banking

Thomas K. Whitford                      Group Executive, Executive Vice President, Strategic Planning

Robert L. Haunschild                    Senior Vice President and Chief Financial Officer

Thomas E. Paisley, III                  Senior Vice President, Corporate Credit Policy

Helen P. Pudlin                         Senior Vice President and General Counsel

Samuel R. Patterson                     Controller

Timothy G. Shack                        Group Executive, Executive Vice President and Chief Information
                                        Officer
</TABLE>

The principal occupation of each of the foregoing executive officers of The PNC
Financial Services Group, Inc. is officer of The PNC Financial Services Group,
Inc. or officer of PNC Bank, National Association. The business address of each
such executive officer is c/o The PNC Financial Services Group, Inc., One PNC
Plaza, 249 Fifth Avenue, Pittsburgh, PA 15222-2707, and each such executive
officer is a United States citizen.

         The names, business addresses and principal occupations of the
directors of The PNC Financial Services Group, Inc. are set forth below(3):

------------------
(2)  Mr. Rohr is the President of PNC Bancorp, Inc. Mr. Rohr is an executive
     officer and director of each of The PNC Financial Services Group, Inc. and
     PNC Bank, National Association. The required information with respect to
     Mr. Rohr is provided elsewhere in this Item 2. Calvert A. Morgan, Jr. is
     the Chairman of PNC Bancorp, Inc. and Maria C. Schaffer serves as an
     Executive Vice President of PNC Bancorp, Inc. The required information with
     respect to Mr. Morgan and Ms. Schaffer is provided in footnote 3 to this
     Item 2.

(3)  The directors of PNC Bancorp, Inc. are Robert L. Haunschild, Calvert A.
     Morgan, Jr. and Maria C. Schaffer. Mr. Haunschild is an executive officer
     of The PNC Financial Services Group, Inc. and the required information with
     respect to him is provided elsewhere in this Item 2. The business address
     of each of Mr. Morgan and Ms. Schaffer is PNC Bank, Delaware, 222 Delaware
     Avenue, Wilmington, DE 19899.
<PAGE>   10
CUSIP No. 377316 10 4                                        Page 10 of 20 pages


<TABLE>
<CAPTION>
Names                                 Business Addresses                                 Principal Occupations
-----                                 ------------------                                 ---------------------
<S>                                   <C>                                                <C>
Paul W. Chellgren                     Ashland Inc.                                       Chairman and Chief
                                      P.O. Box 391                                       Executive Officer
                                      Covington, KY 41012-0391

Robert N. Clay                        Clay Holding Company                               President and Chief
                                      Three Chimneys Farm                                Executive Officer
                                      P.O. Box 114
                                      Midway, KY 40347

George A. Davidson, Jr.               Dominion Resources, Inc.                           Retired Chairman
                                      Dominion Tower, 22nd Floor
                                      625 Liberty Avenue
                                      Pittsburgh, PA 15222-3199

David F. Girard-diCarlo               Blank Rome Comisky & McCauley LLP                  Co-Chairman and Managing
                                      One Logan Square                                   Partner
                                      Philadelphia, PA 19103-6998

Walter E. Gregg, Jr.                  The PNC Financial Services Group, Inc.             Vice Chairman
                                      One PNC Plaza, 30th Floor
                                      249 Fifth Avenue
                                      Pittsburgh, PA 15222-2707

William R. Johnson                    H. J. Heinz Company                                Chairman, President and
                                      World Headquarters                                 Chief Executive Officer
                                      P.O. Box 57
                                      Pittsburgh, PA 15230-0057

Bruce C. Lindsay                      Brind-Lindsay & Co., Inc.                          Chairman and Managing
                                      1926 Arch Street                                   Director
                                      Philadelphia, PA 19103-1444

W. Craig McClelland                   Union Camp Corporation                             Retired Chairman and
                                      50 Tice Boulevard                                  Chief Executive Officer
                                      Woodcliff Lake, NJ 07675
</TABLE>

------------------
     The principal occupation of Mr. Morgan is Chairman, President and Chief
     Executive Officer of PNC Bank, Delaware, and the principal occupation of
     Ms. Schaffer is Vice President, Controller, Treasurer and Assistant
     Secretary of PNC Bank, Delaware. Each of Mr. Morgan and Ms. Schaffer is a
     United States citizen.
<PAGE>   11
CUSIP No. 377316 10 4                                        Page 11 of 20 pages

<TABLE>
<CAPTION>
Names                                 Business Addresses                                 Principal Occupations
-----                                 ------------------                                 ---------------------
<S>                                   <C>                                                <C>
Thomas H. O'Brien                     The PNC Financial Services Group, Inc.             Retired Chairman
                                      One PNC Plaza
                                      249 Fifth Avenue
                                      Pittsburgh, PA 15222-2707

Jane G. Pepper                        Pennsylvania Horticultural Society                 President
                                      100 N. 20th Street - 5th Floor
                                      Philadelphia, PA 19103-1495

James E. Rohr                         The PNC Financial Services Group, Inc.             Chairman, President and
                                      One PNC Plaza                                      Chief Executive  Officer
                                      249 Fifth Avenue
                                      Pittsburgh, PA 15222-2707

Lorene K. Steffes                     IBM Corporation                                    Vice President Software
                                      Westinghouse Building                              Services and Software
                                      11 Stanwix Street, 23rd Floor                      Group Pittsburgh Site
                                      Pittsburgh, PA 15222                               Executive

Dennis F. Strigl                      Verizon Wireless Services, LLC                     President and Chief
                                      180 Washington Valley Road                         Executive Officer
                                      Bedminster, NJ 07921

Thomas J. Usher                       USX Corporation                                    Chairman and Chief
                                      61st Floor                                         Executive Officer
                                      600 Grant Street
                                      Pittsburgh, PA 15219-4776

Milton A. Washington                  AHRCO                                              President and Chief
                                      5604 Baum Boulevard                                Executive Officer
                                      Pittsburgh, PA 15206

Helge H. Wehmeier                     Bayer Corporation                                  President and Chief
                                      100 Bayer Road, Building 4                         Executive Officer
                                      Pittsburgh, PA 15205-9741
</TABLE>

Each of the foregoing directors except Mr. Wehmeier is a United States citizen.
Mr. Wehmeier is a citizen of Germany.

         During the last five years, none of the persons named in this Item 2
has been (i) convicted in a criminal proceeding (excluding traffic violations or
similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of
<PAGE>   12
CUSIP No. 377316 10 4                                        Page 12 of 20 pages

such proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state securities laws or finding any violation with respect to such laws.(4)

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         The Trust Shares were deposited in the Voting Trust under the terms and
conditions set forth in the Trust Agreement, and no consideration was paid
therefor.

         An aggregate of 701,950 Trust Shares has been pledged to PNC Bank,
National Association by three revocable Fiduciary Trusts as collateral for loans
to the settlors of such Fiduciary Trusts in the aggregate principal amount of
$3,796,016.85 as of August 17, 2001 . Pursuant to the Trust Agreement, PNC Bank,
National Association will retain a security interest in the interests of such
Fiduciary Trusts in the Voting Trust. (See Item 6 below and Sections 3 and 13 of
Trust Agreement.)

ITEM 4.  PURPOSE OF TRANSACTION

         PNC Bank, National Association has longstanding relationships with the
Company, the Family Members and the Fiduciary Trusts, through one or more of its
roles as a lender, financial advisor, trustee, executor, agent and custodian.
PNC Bank, National Association determined to effect and administer the Voting
Trust in an effort to promote the education of the Family Members regarding the
Company's business, especially among the younger generations of Family Members.
PNC Bank, National Association believes that the Voting Trust will provide
Company management with a means of communicating, through the Constituents, with
a wide range of Family Members, which should encourage Company management to
pursue the Company's long-term strategic plans that are supported by the Voting
Trust, for the benefit of all shareholders of the Company.

         The Fiduciary Trusts were selected by PNC Bank, National Association as
the participants in the Voting Trust because the Family Members who are the
settlors, co-trustees and beneficiaries of the Fiduciary Trusts have generally
had an interest in and involvement with the Company and PNC Bank, National
Association over many years. The Trust Agreement permits certain other
shareholders of the Company to become participants in the Voting Trust, subject
to the approval of the Voting Trustee. (See Section 9 of Trust Agreement.)
Generally, the shareholders eligible to participate in the Voting Trust would be
any Family Members or fiduciary trusts, in addition to the Fiduciary Trusts,
that have been, or may be, established for the benefit of any Family Members
(the "Other Family Trusts"). PNC Bank, National Association is the sole trustee
of nine Other Family Trusts. While PNC Bank, National Association has no present
plans to effect the participation of any Other Family Trusts in the Voting
Trust, PNC Bank, National Association may in the future do so.

------------------
(4)  This statement applies as well to PNC Bancorp, Inc. and its executive
     officers and directors. See notes 1, 2 and 3 above.
<PAGE>   13
CUSIP No. 377316 10 4                                        Page 13 of 20 pages

         None of the persons named in Item 2 above has any present plans which
relate to or would result in: (i) the acquisition by any person of additional
securities of the Company, or the disposition of securities of the Company,
except in amounts which are not material; (ii) an extraordinary corporate
transaction, such as a merger, reorganization or liquidation, involving the
Company or any of its subsidiaries; (iii) a sale or transfer of a material
amount of assets of the Company or any of its subsidiaries; (iv) any change in
the present board of directors or management of the Company, including any plans
or proposals to change the number or term of directors or to fill any existing
vacancies on the board; (v) any material change in the present capitalization or
dividend policy of the Company; (vi) any other material change in the Company's
business or corporate structure; (vii) changes in the Company's charter, bylaws
or instruments corresponding thereto or other actions which may impede the
acquisition of control of the issuer by any person; (viii) causing a class of
securities of the Company to be delisted from a national securities exchange or
to cease to be authorized to be quoted in an inter-dealer quotation system of a
registered national securities association; (ix) a class of equity securities of
the Company becoming eligible for termination of registration pursuant to
Section 12(g)(4) of the Securities Exchange Act of 1934, as amended; or (x) any
action similar to any of those enumerated in (i)-(ix) above.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

         The Voting Trustee has sole voting power as to the 12,515,675 Trust
Shares, which represent approximately 29.4% of the outstanding shares of Common
Stock.(5) The Voting Trustee does not have any dispositive power as to the Trust
Shares.

         The Trust Shares may be voted only by the Voting Trustee in accordance
with the affirmative vote of a majority of the votes cast by the Constituents
pursuant to a weighted formula in which (i) each Group Constituent is entitled
to cast such number of votes as is equal to the number of Trust Shares in which
any Family Member of his or her Group has an interest as a settlor of a
revocable Fiduciary Trust, or as a current income beneficiary (or, if there is
none, as a current distribution beneficiary) of an irrevocable Fiduciary Trust
and (ii) the Bank Constituent is entitled to cast such number of votes as is
equal to the number of Trust Shares in which any irrevocable Fiduciary Trust has
an interest. (See Sections 5 and 11(f) of Trust Agreement.)

         None of the Constituents, as such, has any dispositive power as to the
Trust Shares. Except as otherwise provided in this paragraph, none of the
Constituents, as such, has any voting power as to the Trust Shares. PNC Bank,
National Association has certain powers that may be construed as shared voting
power as to the Trust Shares. As a result of its status as the Bank Constituent,
PNC Bank, National Association has the power to cast a considerable number of
votes in any determination by the Voting Trustee. (See Sections 5 and 11(f) of
Trust Agreement.) While its votes as Bank Constituent alone may not be
determinative of Voting Trustee action, PNC Bank, National Association, as the
initial Trust Agent of the Voting Trust (the "Trust Agent"), may for a time also
occupy the position of any Group Constituent, should a

------------------
(5)  The percentage of outstanding shares of Common Stock is based on the shares
     held by the Voting Trustee on August 17, 2001 and the total number of
     outstanding shares on July 31, 2001 as reported in the P. H. Glatfelter
     Company's Quarterly Report on Form 10-Q for the quarter ended June 30,
     2001.
<PAGE>   14
CUSIP No. 377316 10 4                                        Page 14 of 20 pages

vacancy occur in that position, until a successor Group Constituent is appointed
for the respective Group. (See Section 7 of Trust Agreement.) In such event, PNC
Bank, National Association, as the Trust Agent, would cast the votes of that
Group Constituent, as well as its own votes as the Bank Constituent, in
determining Voting Trustee action, and might well then be in a position to
determine such action for a time. PNC Bank, National Association and The PNC
Financial Services Group, Inc. report such shared voting power over the Trust
Shares on a separate Form 13D filed with the Securities and Exchange Commission.

         The Trust Agent also has broad administrative powers. (See Sections 5
and 8-14 of Trust Agreement.) In addition, the Trust Agent has discretionary
authority over the timing of certain withdrawals of Trust Shares. (See Section
8(a) of Trust Agreement and Item 6 of the Initial Schedule 13D.)

         Other than as disclosed in this statement, no person named in Item 2
above has any beneficial ownership over shares of the Common Stock. In
accordance with Rule 13d-3, shares of the Common Stock may be beneficially owned
by more than one person. This is true also of the Trust Shares. Pursuant to the
Trust Agreement, the Fiduciary Trusts may withdraw the Trust Shares they
deposited in the Voting Trust at any time if certain conditions are met. (See
Section 8 of Trust Agreement and Item 6 of the Initial Schedule 13D.) Thus, each
Fiduciary Trust, and its trustee or co-trustees, may be deemed to retain voting
and dispositive power over the Trust Shares deposited by it. In addition,
certain Trust Shares are subject to various rights to acquire as set forth in
various Fiduciary Trust documents and other documents ancillary thereto. Thus,
the persons who possess such rights may also be deemed to have voting and
dispositive power over the Trust Shares subject to such rights. Notwithstanding
the beneficial ownership of the Trust Shares by several persons, the total
number of Trust Shares is 12,515,675.

         Katherine G. Costello has beneficial ownership of 801,895 Trust Shares
held by one Fiduciary Trust (the "Costello Fiduciary Trust"). She has the right
to revoke the Costello Fiduciary Trust and to withdraw such Trust Shares, at
which point she would have sole voting and dispositive power as to such Trust
Shares. PNC Bank, National Association, as sole trustee of the Costello
Fiduciary Trust, currently has sole voting and dispositive power as to such
Trust Shares. Ms. Costello may be deemed to have shared voting and dispositive
power, as co-trustee with PNC Bank, National Association, as to 16,500 Trust
Shares held by four Fiduciary Trusts.

         William M. Eyster, II has beneficial ownership of 16,933 Trust Shares
held by one Fiduciary Trust. He has the right to revoke such Fiduciary Trust and
to withdraw such Trust Shares, at which point he would have sole voting and
dispositive power as to such Trust Shares. PNC Bank, National Association, as
sole trustee of such Fiduciary Trust, currently has sole voting and dispositive
power as to such Trust Shares. Mr. Eyster may be deemed to have shared voting
and dispositive power, as co-trustee with PNC Bank, National Association, as to
28,000 Trust Shares held by one Fiduciary Trust. In addition to such Trust
Shares, Mr. Eyster has sole voting and dispositive power as to 5,000 other
shares of Common Stock.

         Elizabeth Glatfelter has beneficial ownership of 897,367 Trust Shares
held by one Fiduciary Trust (the "Glatfelter Fiduciary Trust"). She has the
right to revoke the Glatfelter Fiduciary Trust and to withdraw such Trust
Shares, at which point she would have sole voting and dispositive power as to
such Trust Shares. PNC Bank, National Association, as sole trustee
<PAGE>   15
CUSIP No. 377316 10 4                                        Page 15 of 20 pages

of the Glatfelter Fiduciary Trust, currently has sole voting and dispositive
power as to such Trust Shares. Ms. Glatfelter may be deemed to have shared
voting and dispositive power, as co-trustee with PNC Bank, National Association,
as to 76,548 Trust Shares held by two Fiduciary Trusts. Ms. Glatfelter may also
have been deemed to have had shared voting and dispositive power, as co-trustee
with PNC Bank, National Association, as to 970,327 Trust Shares held in a third
Fiduciary Trust established by her mother Anne M. Glatfelter (the "Anne
Glatfelter Fiduciary Trust"), who died on January 30, 2001. As a result of Anne
Glatfelter's death, the Trust Shares held in the Anne Glatfelter Fiduciary Trust
pass without consideration to a separate trust. Neither PNC Bank, National
Association nor any Family Member is a trustee of such separate trust. In
conjunction with the transfer of the Trust Shares to such separate trust, the
Trust Shares were withdrawn from the Voting Trust on August 17, 2001.

         Susan M. G. Wilson has beneficial ownership of 216 Trust Shares held by
one Fiduciary Trust. She has the right to revoke such Fiduciary Trust and to
withdraw such Trust Shares, at which point she would have sole voting and
dispositive power as to such Trust Shares. PNC Bank, National Association, as
co-trustee of such Fiduciary Trust, may be deemed to have shared voting and
dispositive power as to such Trust Shares. Ms. Wilson may be deemed to have
shared voting and dispositive power, as co-trustee with PNC Bank, National
Association, as to 11,360 Trust Shares held by two other Fiduciary Trusts.

         Irene G. Fegley has beneficial ownership of 364,408 shares held by one
Fiduciary Trust. She has the right to revoke such Fiduciary Trust and to
withdraw such Trust Shares, at which point she would have sole voting and
dispositive power as to such Trust Shares. PNC Bank, National Association, as
co-trustee of such Fiduciary Trust, may be deemed to have shared voting and
dispositive power as to such Trust Shares.

         PNC Bank, National Association, as sole trustee of 47 Fiduciary Trusts,
has sole voting and dispositive power as to 10,141,969 Trust Shares, and as
co-trustee of 38 Fiduciary Trusts may be deemed to have shared voting power as
to 2,373,706 Trust Shares and shared dispositive power as to 2,913,994 Trust
Shares. The PNC Financial Services Group, Inc., as the parent of PNC Bank,
National Association, may be deemed to have the same beneficial ownership as to
the Trust Shares as PNC Bank, National Association.(6) Certain Trust Shares as
to which PNC Bank, National Association has beneficial ownership may also be
beneficially owned by the persons serving as the Group Constituents as set forth
in this Item 5. In addition, the Trust Shares may also be beneficially owned by
certain Family Members who are not Group Constituents: 16 such Family Members
are co-trustees, along with PNC Bank, National Association, of one or more of
the Fiduciary Trusts and may be deemed to have beneficial ownership as to the
Trust Shares held by such Fiduciary Trusts; 17 such Family Members have a right
to withdraw an aggregate of 2,866,025 Trust Shares held in 21 Fiduciary
Trusts;(7) one such Family Member has a right to purchase 487,632 Trust Shares
held in two Fiduciary Trusts of which PNC Bank, National Association is sole
trustee, and an annual, non-cumulative right of

------------------
(6)  The same is true of PNC Bancorp, Inc. See notes 1, 2, 3 and 4 above.

(7)  Each of three such Family Members has a right to withdraw 8,872 Trust
     Shares from a Fiduciary Trust upon 90 days' notice. In respect of all other
     Trust Shares, the withdrawal right may be exercised at any time.
<PAGE>   16
CUSIP No. 377316 10 4                                        Page 16 of 20 pages

withdrawal equal to the greater of 5% or $5,000, which relates to 88,316 Trust
Shares held by four Fiduciary Trusts;(8) one such Family Member has an annual,
non-cumulative right of withdrawal equal to the greater of 5% or $5,000, which
relates to 88,312 Trust Shares held by two Fiduciary Trusts; and ten such Family
Members, each a beneficiary of a separate Fiduciary Trust, have a 60-day
non-cumulative right of withdrawal after a gift has been made to the respective
Fiduciary Trust in respect to an amount equal to the annual gift tax exclusion,
which rights, collectively, relate to 82,872 Trust Shares.

         PNC Bank, National Association has sole voting and dispositive power as
to an aggregate of 2,306,178 shares of Common Stock which are held of record by
the Other Family Trusts.

         In addition to the beneficial ownership of the Trust Shares and the
Common Stock held of record by the Other Family Trusts, as described above, The
PNC Financial Services Group, Inc. has sole voting and dispositive power as to
164,413 shares of Common Stock, sole voting and no dispositive power as to
304,667 shares of Common Stock and may be deemed to have shared voting and
dispositive power as to 17,618 shares of Common Stock (collectively, the
"Non-Family Shares"). All of the Non-Family Shares are held of record by PNC
Bank, National Association in the ordinary course of business, as sole trustee,
co-trustee or executor of fiduciary accounts other than the Fiduciary Trusts and
the Other Family Trusts, as sole trustee or co-trustee of charitable trusts, or
as custodian or agent. The PNC Financial Services Group, Inc. and PNC Bank,
National Association, as trustee, executor, custodian and agent, report their
respective beneficial ownership of the Trust Shares, the shares of Common Stock
held of record by the Other Family Trusts, and the Non-Family Shares on a
Schedule 13G filed with the Securities and Exchange Commission.(9)

         Each of the Fiduciary Trusts has the right to receive cash dividends
and distributions of property except voting securities in respect of the Trust
Shares formerly held of record by it, and the Voting Trustee will instruct the
Company to pay such dividends and distributions directly to the respective
Fiduciary Trusts. (See Sections 2 and 10 of Trust Agreement.)

         Except as set forth in this Item 5, none of the persons named in Item 2
has had any transactions in shares of the Common Stock in the last 60 days.

------------------
(8)  This Family Member also has a right to purchase 2,306,178 shares of Common
     Stock that are held of record by nine Other Family Trusts.

(9)  PNC Bank, National Association, as trustee or co-trustee of the Fiduciary
     Trusts, and The PNC Financial Services Group, Inc. include their beneficial
     ownership as to the Trust Shares on their Schedule 13G because the Trust
     Shares may be withdrawn from the Voting Trust by the Fiduciary Trusts,
     generally within 60 days. (See Item 6 of the Initial Schedule 13D.) Such
     right of withdrawal may be deemed to continue the beneficial ownership of
     the Trust Shares by PNC Bank, National Association, as trustee or
     co-trustee of the Fiduciary Trusts, that existed prior to the establishment
     of the Voting Trust.
<PAGE>   17
CUSIP No. 377316 10 4                                        Page 17 of 20 pages

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
         TO SECURITIES OF THE ISSUER

         In addition to the matters described in Item 5, the following
additional information is provided regarding contracts, arrangements,
understandings and relationships with respect to shares of Common Stock. Under
the Trust Agreement, the Trust Shares will be voted by the Voting Trustee in
accordance with the Trust Agreement. (See Items 2 and 5 above and Sections 5 and
11 of Trust Agreement.) The Voting Trust will continue until it is terminated by
action of the Voting Trustee or the withdrawal of all the Trust Shares in
accordance with the Trust Agreement. (See Section 4 of Trust Agreement.)

         A Fiduciary Trust generally may withdraw the Trust Shares deposited by
it, and may deposit additional shares of Common Stock into the Voting Trust.
(See Sections 8 and 9 of Trust Agreement.) Prior to the withdrawal of any Trust
Shares for sale, such Trust Shares must first be offered to the Company pursuant
to any stock repurchase plan of the Company then in effect. (See Section 8(a)(i)
of Trust Agreement.) No Trust Shares may be withdrawn from the Voting Trust, and
no shares of Common Stock may be added to the Voting Trust, if such withdrawal
or addition would trigger any rights under provisions then applicable to the
Company of 15 Pa.C.S. Subch. 25E-J or any successor or similar provisions of the
Pennsylvania Business Corporation Law (the "BCL"). (See Sections 8(d), 9(d) and
10(g) of Trust Agreement.) Subject to the foregoing right of first refusal in
favor of any Company stock repurchase plan and the limitations on withdrawals
that may result if rights would be triggered under Subch. 25E-J of the BCL, the
Trust Shares may be withdrawn for sale or other transfer subject to certain
notice requirements, and may be withdrawn without delay at any time subject to
the approval of the Trust Agent. (See Item 5 above and Section 8(a) of Trust
Agreement.)

         The Group Constituents serve staggered three-year terms. (See Section 6
of Trust Agreement.) A Group Constituent may resign at any time, and any vacancy
created by such resignation or the death or disability of a Group Constituent
will be filled by vote of certain Family Members of that Group. (See Sections 6
and 7 of Trust Agreement.) As discussed in Item 5 above, the Trust Agent may for
a time occupy such a vacancy. (See Section 7 of Trust Agreement.)

         None of the Constituents or the Trust Agent will receive any
compensation or commissions for acting as such but will be reimbursed for any
reasonable out-of-pocket expenses that may be incurred in such capacities, and
will be indemnified against any liabilities that may be incurred as a result of
carrying on the business of the Voting Trust except where the conduct of the
Constituent or Trust Agent constitutes self-dealing, willful misconduct, gross
recklessness or bad faith. (See Sections 15 and 16 of Trust Agreement.)

         An aggregate of 701,950 Trust Shares has been pledged to PNC Bank,
National Association as collateral for loans made to the settlors of three
revocable Fiduciary Trusts. (See Item 3 above.) If such loans were in default
and PNC Bank, National Association, as lender, exercised its rights under the
respective standard default provisions of the loan documents, PNC Bank, National
Association could cause such Trust Shares to be withdrawn from the Voting Trust
and obtain sole voting and dispositive power as to such Trust Shares. (See
Sections 3 and 13 of Trust Agreement.)
<PAGE>   18
CUSIP No. 377316 10 4                                        Page 18 of 20 pages

         Except as disclosed in this statement, there are no contracts,
arrangements, understandings or relationships (legal or otherwise) among the
persons named in Item 2 or between such persons and any other person with
respect to any securities of the Company.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

         The following document was filed as an exhibit to the Initial Schedule
13D filed by the Voting Trust and the Voting Trustee on July 2, 1993 (File No.
5-12158) and is hereby incorporated by reference:

               P. H. Glatfelter Family Shareholders Voting Trust dated as of
July 1, 1993.
<PAGE>   19
CUSIP No. 377316 10 4                                        Page 19 of 20 pages


                                    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.

                                 P. H. GLATFELTER FAMILY
                                 SHAREHOLDERS' VOTING TRUST established
                                 pursuant to agreement dated as of July 1, 1993

                                 BY:    PNC BANK, NATIONAL ASSOCIATION,
                                        AS TRUST AGENT


September 13, 2001               By:     /s/ Jonathan D. Scott
       Date                                       Name:  Jonathan D. Scott
                                                  Title: Vice President
<PAGE>   20
CUSIP No. 377316 10 4                                        Page 20 of 20 pages


                                    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.

                                   VOTING TRUSTEE OF P. H. GLATFELTER
                                   FAMILY SHAREHOLDERS' VOTING TRUST
                                   established pursuant to agreement dated as of
                                   July 1, 1993

                                   BY:  PNC BANK, NATIONAL ASSOCIATION,
                                        AS TRUST AGENT

September 13, 2001                      By:  /s/ Jonathan D. Scott
       Date                                          Name:  Jonathan D. Scott
                                                     Title: Vice President




</TEXT>
</DOCUMENT>
