PARKER DRILLING CO /DE/
SC 13G, 1996-01-29
DRILLING OIL & GAS WELLS
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*
 
                            Parker Drilling Company
- --------------------------------------------------------------------------------
                               (Name of Issuer)

                                 Common Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                   701081101
                       --------------------------------
                                (CUSIP Number)

Check the following box if a fee is being paid with this statement [_]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*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 1 OF 11 PAGES
<PAGE>
 
- ---------------------------                       ------------------------------
CUSIP No. 701081101                   13G              Page  2  of  11  Pages
- ---------------------------                       ------------------------------
- --------------------------------------------------------------------------------
  1  NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 
     John Hancock Mutual Life Insurance Company
     I.R.S. No. 04-1414660
- --------------------------------------------------------------------------------
  2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a)  [_]
                                                             (b)  [_] 
                             
     N/A
- --------------------------------------------------------------------------------
  3  SEC USE ONLY
- --------------------------------------------------------------------------------
  4  CITIZENSHIP OR PLACE OF ORGANIZATION
 
     Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
              5  SOLE VOTING POWER
  Number of  
   Shares        -0-
              ------------------------------------------------------------------
Beneficially  6  SHARED VOTING POWER
  Owned by   
    Each         -0-
              ------------------------------------------------------------------
  Reporting   7  SOLE DISPOSITIVE POWER
   Person    
    With         -0-
              ------------------------------------------------------------------
              8  SHARED DISPOSITIVE POWER
 
                 -0-
- --------------------------------------------------------------------------------
  9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
                                              
     None, except through its indirect, wholly-owned subsidiaries, NM Capital
     Management, Inc. and John Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
  10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                                                      
      N/A
- --------------------------------------------------------------------------------
  11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
 
     See line 9, above.
- --------------------------------------------------------------------------------
  12 TYPE OF REPORTING PERSON*
 
     IC, BD, IA, HC
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 2 OF 11 PAGES
<PAGE>
 
- ---------------------------                       ------------------------------
CUSIP No. 701081101                   13G              Page  3  of  11  Pages
- ---------------------------                       ------------------------------
- --------------------------------------------------------------------------------
  1  NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 
     John Hancock Subsidiaries, Inc.
     I.R.S. No. 04-2687223
- --------------------------------------------------------------------------------
  2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  [_]
                                                            (b)  [_]
     N/A
- --------------------------------------------------------------------------------
  3  SEC USE ONLY
- --------------------------------------------------------------------------------
  4  CITIZENSHIP OR PLACE OF ORGANIZATION
 
     Delaware
- --------------------------------------------------------------------------------
              5  SOLE VOTING POWER
  Number of         
   Shares        -0-
              ------------------------------------------------------------------
Beneficially  6  SHARED VOTING POWER
  Owned by          
    Each         -0-
              ------------------------------------------------------------------
  Reporting   7  SOLE DISPOSITIVE POWER
   Person           
    With         -0-
              ------------------------------------------------------------------
              8  SHARED DISPOSITIVE POWER
 
                 -0-
- --------------------------------------------------------------------------------
  9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
                             
     None, except through its indirect, wholly-owned subsidiaries, NM Capital
     Management, Inc. and John Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
  10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                             
      N/A
- --------------------------------------------------------------------------------
  11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
 
     See line 9, above.
- --------------------------------------------------------------------------------
  12 TYPE OF REPORTING PERSON*
 
     HC
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 3 OF 11 PAGES
<PAGE>
 
- ---------------------------                       ------------------------------
CUSIP No. 701081101                   13G              Page  4  of  11  Pages
- ---------------------------                       ------------------------------
- --------------------------------------------------------------------------------
  1  NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 
     John Hancock Asset Management
     I.R.S. No.   04-3279774
- --------------------------------------------------------------------------------
  2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ] 
                                                                    (b) [ ] 
     N/A
- --------------------------------------------------------------------------------
  3  SEC USE ONLY
- --------------------------------------------------------------------------------
  4  CITIZENSHIP OR PLACE OF ORGANIZATION
 
     Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
              5  SOLE VOTING POWER
  Number of         
   Shares        -0-
              ------------------------------------------------------------------
Beneficially  6  SHARED VOTING POWER
  Owned by          
    Each         -0-
              ------------------------------------------------------------------
  Reporting   7  SOLE DISPOSITIVE POWER
   Person           
    With         -0-
              ------------------------------------------------------------------
              8  SHARED DISPOSITIVE POWER
 
                 -0-
- --------------------------------------------------------------------------------
  9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
                                              
     None, except through its indirect, wholly-owned subsidiaries, NM Capital
     Management, Inc. and John Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
  10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                                                      
     N/A
- --------------------------------------------------------------------------------
  11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
 
     See line 9, above.
- --------------------------------------------------------------------------------
  12 TYPE OF REPORTING PERSON*
 
     HC
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 4 OF 11 PAGES
<PAGE>
 
- ---------------------------                       ------------------------------
CUSIP No. 701081101                   13G              Page  5  of  11  Pages
- ---------------------------                       ------------------------------
  1  NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 
     The Berkeley Financial Group
     I.R.S. No. 04-3145626
- --------------------------------------------------------------------------------
  2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  [_]
                                                            (b)  [_]
     N/A
- --------------------------------------------------------------------------------
  3  SEC USE ONLY
- --------------------------------------------------------------------------------
  4  CITIZENSHIP OR PLACE OF ORGANIZATION
 
     Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
              5  SOLE VOTING POWER
  Number of         
   Shares        -0-
              ------------------------------------------------------------------
Beneficially  6  SHARED VOTING POWER
  Owned by          
    Each         -0-
              ------------------------------------------------------------------
  Reporting   7  SOLE DISPOSITIVE POWER
   Person           
    With         -0-
              ------------------------------------------------------------------
              8  SHARED DISPOSITIVE POWER
 
                 -0-
- --------------------------------------------------------------------------------
  9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
                                              
     4,957,371: 4,869,571 through its direct, wholly owned subsidiary, NM
     Capital Management, Inc. and 87,800 through its direct, wholly-owned
     subsidiary, John Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
  10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                             
     N/A
- --------------------------------------------------------------------------------
  11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
 
     8.8%
- --------------------------------------------------------------------------------
  12 TYPE OF REPORTING PERSON*
 
     HC
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 5 OF 11 PAGES
<PAGE>
 
- ---------------------------                       ------------------------------
CUSIP No. 701081101                   13G              Page  6  of  11  Pages
- ---------------------------                       ------------------------------
  1 NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 
    NM Capital Management, Inc.
    I.R.S. No. 85-0268885
- --------------------------------------------------------------------------------
  2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  [_]
                                                            (b)  [_]
     N/A
- --------------------------------------------------------------------------------
  3  SEC USE ONLY
- --------------------------------------------------------------------------------
  4  CITIZENSHIP OR PLACE OF ORGANIZATION
 
     New Mexico
- --------------------------------------------------------------------------------
              5  SOLE VOTING POWER
  Number of         
   Shares        2,214,581                                                      
              ------------------------------------------------------------------
Beneficially  6  SHARED VOTING POWER
  Owned by          
    Each         -0-                                                            
              ------------------------------------------------------------------
  Reporting   7  SOLE DISPOSITIVE POWER
   Person           
    With         4,869,571                                                      
              ------------------------------------------------------------------
              8  SHARED DISPOSITIVE POWER
 
                 -0-
- --------------------------------------------------------------------------------
  9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 
 
     4,869,571
- --------------------------------------------------------------------------------
  10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
 
     N/A
- --------------------------------------------------------------------------------
  11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
 
     8.6%
- --------------------------------------------------------------------------------
  12 TYPE OF REPORTING PERSON*
 
     IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 6 OF 11 PAGES
<PAGE>
 
     The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative.  If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any tittle of each person who signs the statement shall be typed or
printed beneath his signature.

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.

    Attention:  Intentional misstatements or omissions of fact constitute
Federal criminal violations (See 18 U.S.C. 1001)


     Item 1(a)  Name of Issuer:
                -------------- 
                Parker Drilling Co.

     Item 1(b)  Address of Issuer's Principal Executive Offices:
                ----------------------------------------------- 
                Parker Building        
                Eight East Third Street
                Tulsa, OK  74103        

     Item 2(a)  Name of Person Filing:
                --------------------- 
                This filing is made on behalf of John Hancock Mutual Life
                Insurance Company ("JHMLICO"), JHMLICO's direct, wholly-owned
                subsidiary, John Hancock Subsidiaries, Inc. ("JHSI"), JHSI's
                direct, wholly-owned subsidiary, John Hancock Asset Management
                ("JHAM"), JHAM wholly-owned subsidiary, The Berkeley Financial
                Group ("TBFG") and TBFG's direct, wholly-owned subsidiary, NM
                Capital Management, Inc. ("NM").

     Item 2(b)  Address of the Principal Offices:
                -------------------------------- 
                The principal business offices of JHMLICO, JHSI and JHAM are
                located at John Hancock Place, P.O. Box 111, Boston, MA 02177.
                The principal business offices of TBFG is located at 101
                Huntington Avenue, Boston, Massachusetts 02199. The principal
                business office of NM is 6501 Americas Parkway, Suite 950,
                Albuquerque, NM 87110-5372.

     Item 2(c)  Citizenship:
                ---------------------------
                JHMLICO, JHAM and TBFG were organized and exist under the laws
                of the Commonwealth of Massachusetts. JHSI was organized and
                exists under the laws of the State of Delaware. NM was organized
                and exists under the laws of the State of New Mexico.

     Item 2(d)  Title of Class of Securities:
                ---------------------------- 
                Common Stock.

     Item 2(e)  CUSIP Number:
                ------------ 
                701081101

     Item 3     If the Statement is being filed pursuant to Rule 13d-1(b), or
                -------------------------------------------------------------  
                13d-2(b), check whether the person filing is a:
                -----------------------------------------------

                JHMLICO:  (a) (X) Broker or Dealer registered under (S)15 of
                                  the Act.

                          (c) (X) Insurance Company as defined in (S)3(a)(19) of
                                  the Act.

                          (e) (X) Investment Adviser registered under (S)203 of
                                  the Investment Advisers Act of 1940.

 
                               PAGE 7 OF 11 PAGES
 


 


 



<PAGE>
 
                          (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).
 
                JHSI      (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).
 
                JHAM      (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).
 
                TBFG      (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).
 
                NM        (e) (X) Investment Adviser registered under (S)203 of
                                  the Investment Advisers Act of 1940.
 
     Item 4     Ownership:
                ------------
 
                (a)  Amount Beneficially Owned: NM beneficially owns 4,869,571
                     shares of Common Stock in various advisory accounts. In
                     addition to the shares owned by NM, John Hancock Advisers,
                     Inc. ("JHA"), an Investment Adviser registered under (S)203
                     of the Investment Advisers Act of 1940 and a direct, 
                     wholly-owned subsidiary of TBFG, beneficially owns 87,800
                     shares of Common Stock. Through their parent-subsidiary
                     relationship to NM and JHA, JHMLICO, JHSI, JHAM and TBFG
                     have indirect, beneficial ownership of these same shares.
                     
                     The JHA shares are held by the: 

                     John Hancock Special Value Fund, an open-end diversified
                     management company registered under S8 of the Investment
                     Company Act. Under an Advisory Agreement dated October 1,
                     1993, JHA has beneficial ownership of the 74,200 shares
                     held in the fund. 
                     
                     John Hancock Institutional Series Trust-John Hancock
                     Fundamental Value Fund an open-end diversified management
                     company registered under S8 of the Investment Company Act.
                     Under an Advisory Agreement dated April 3, 1995, JHA has
                     beneficial ownership of the 13,600 shares held in the fund.
 
                (b)  Percent of Class:
                     -----------------
                     TBFG - 8.8%
                     NM   - 8.6%
                     JHA  -  .2%
 
                (c)  (i)    sole power to vote or to direct the vote:
                            NM  - 2,214,581                          
                            JHA -    87,800                           

                     (ii)   shared power to vote or to direct the vote:   -0-

                     (iii)  sole power to dispose or to direct the disposition
                            of:
                            NM  - 4,869,571
                            JHA -    87,800

                     (iv)   shared power to dispose or to direct the disposition
                            of:    -0-



                               PAGE 8 OF 11 PAGES
<PAGE>
 
     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:
                --------------------------------------------------------------- 
                See Item 4(a).

     Item 7     Identification and Classification of the Subsidiary which
                ---------------------------------------------------------
                Acquired the Security Being Reported on by the Parent Holding
                -------------------------------------------------------------
                Company:
                --------
                See Items 2(a), 3 and 4.

     Item 8     Identification and Classification of Members of the Group:
                --------------------------------------------------------- 
                Not applicable.

     Item 9     Notice of Dissolution of a Group:
                -------------------------------- 
                Not applicable.

     Item 10    Certification:
                ------------- 
                By signing below the undersigned certifies that, to the best of
                its 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 9 OF 11 PAGES
<PAGE>
 
                                   SIGNATURE

     After reasonable inquiry and to the best of its knowledge and belief, each
of the undersigned certifies that the information set forth in this statement is
true, complete and correct.
 



                             JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY       
                             By: /s/ John T. Farady
                                 --------------------------------------  
                             Name: John T. Farady
                                   ------------------------------------
Dated: January 24, 1996      Title: Senior Vice President & Treasurer
       ----------------             -----------------------------------
                        


                             JOHN HANCOCK SUBSIDIARIES, INC.                  
                             By: /s/ John T. Farady                           
                                 -------------------------------------- 
                             Name: John T. Farady                             
                                   ------------------------------------ 
Dated: January 24, 1996      Title: Treasurer                                 
       ----------------             ----------------------------------- 


                             JOHN HANCOCK ASSET MANAGEMENT                     
                             By: /s/ James H. Young
                                 ---------------------------------------
                             Name: James H. Young
                                   -------------------------------------
Dated: January 23, 1996      Title: Secretary
       ----------------             ------------------------------------


                             THE BERKELEY FINANCIAL GROUP                     
                             By: /s/ Susan S. Newton                          
                                 ---------------------------------------
                             Name: Susan S. Newton                            
                                   -------------------------------------
Dated: January 24, 1996      Title: Vice President                            
       ----------------             ------------------------------------


                             NM CAPITAL MANAGEMENT, INC.               
                             By: /s/ Susan S. Newton                   
                                 ---------------------------------------   
                             Name: Susan S. Newton                     
                                   -------------------------------------  
Dated: January 24, 1996      Title: Assistant Secretary                 
       ----------------             ------------------------------------  
                            



                              PAGE 10 OF 11 PAGES
<PAGE>
 
                                                               EXHIBIT A

                             JOINT FILING AGREEMENT
                             ----------------------


     John Hancock Mutual Life Insurance Company, John Hancock Subsidiaries,
Inc., The Berkeley Financial Group and NM Capital Mangement, Inc. agree that the
Schedule 13G Amendment No. 1, to which this Agreement is attached, relating to
the Common Stock of Parker Drilling Co., is filed on behalf of each of them.

   
                             JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY       
                             By: /s/ John T. Farady
                                 --------------------------------------  
                             Name: John T. Farady
                                   ------------------------------------
Dated: January 24, 1996      Title: Senior Vice President & Treasurer
       ----------------             -----------------------------------
                        


                             JOHN HANCOCK SUBSIDIARIES, INC.                  
                             By: /s/ John T. Farady                           
                                 -------------------------------------- 
                             Name: John T. Farady                             
                                   ------------------------------------ 
Dated: January 24, 1996      Title: Treasurer                                 
       ----------------             ----------------------------------- 


                             JOHN HANCOCK ASSET MANAGEMENT                     
                             By: /s/ James H. Young
                                 ---------------------------------------
                             Name: James H. Young
                                   -------------------------------------
Dated: January 23, 1996      Title: Secretary
       ----------------             ------------------------------------


                             THE BERKELEY FINANCIAL GROUP                     
                             By: /s/ Susan S. Newton                          
                                 ---------------------------------------
                             Name: Susan S. Newton                            
                                   -------------------------------------
Dated: January 24, 1996      Title: Vice President                            
       ----------------             ------------------------------------


                             NM CAPITAL MANAGEMENT, INC.               
                             By: /s/ Susan S. Newton                   
                                 ---------------------------------------   
                             Name: Susan S. Newton                     
                                   -------------------------------------  
Dated: January 24, 1996      Title: Assistant Secretary                 
       ----------------             ------------------------------------



                              PAGE 11 OF 11 PAGES


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