<Page>

<Table>
<Caption>
--------                                  UNITED STATES SECURITIES AND EXCHANGE COMMISSION             -----------------------------
 FORM 4                                                WASHINGTON, D.C. 20549                                   OMB APPROVAL
--------                                                                                               -----------------------------
/ / CHECK THIS BOX IF NO                    STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP                OMB NUMBER:       3235-0287
    LONGER SUBJECT TO                                                                                   EXPIRES:   January 31, 2005
    SECTION 16.  FORM 4 OR    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,   ESTIMATED AVERAGE BURDEN
    FORM 5 OBLIGATIONS MAY       Section 17(a) of the Public Utility Holding Company Act of 1935 or     HOURS PER RESPONSE .... 0.5
    CONTINUE.  SEE                       Section 30(f) of the Investment Company Act of 1940           -----------------------------
    INSTRUCTION 1(b).
(Print or Type Responses)
------------------------------------------------------------------------------------------------------------------------------------
<S><C>
1. Name and Address of Reporting Person*     2. Issuer Name AND Ticker or Trading Symbol     6. Relationship of Reporting Person(s)
                                                                                                to Issuer (Check all applicable)
                                                                                                /X/  Director
   Halbrook         John            A.          Woodward Governor Company      WGOV             /X/  Officer, Include title
---------------------------------------------------------------------------------------------        Chairman, Chief Executive
    (Last)        (First)        (Middle)    3. IRS or Social Security  4. Statement for             Officer and President
                                                Number of Reporting        Month/Year           / /  10% Owner
                                                Person (Voluntary)                              / /  Other, specify
         5001 North Second Street                                            06/2002           -----------------  ------------------
--------------------------------------------                            --------------------- 7. Individual or Joint/Group Filing
                  (Street)                                              5. If Amendment,          (Check Applicable Line)
                                                                    Date of Original   /X/  Form filed by One Reporting Person
                                                                           (Month/Year)       / /  Form filed by More than One
   Rockford         IL              61111                                                          Reporting Person
------------------------------------------------------------------------------------------------------------------------------------
    (City)       (State)            (Zip)        TABLE I - NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED
------------------------------------------------------------------------------------------------------------------------------------
1. Title of Security               2. Trans-   3. Trans-     4. Securities Acquired (A)    5. Amount of     6. Owner-   7. Nature
   (Instr. 3)                         action      action        or Disposed of (D)            Securities       ship        of In-
                                      Date        Code          (Instr. 3, 4 and 5)           Beneficially     Form:       direct
                                                  (Instr. 8)                                  Owned at         Direct      Bene-
                                     (Month/                                                  End of           (D) or      ficial
                                      Day/     -------------------------------------------    Month            Indirect    Owner-
                                      Year)                               (A) or                               (I)         ship
                                                Code    V       Amount    (D)     Price       (Instr. 3        (Instr. 4) (Instr. 4)
                                                                                              and 4)
------------------------------------------------------------------------------------------------------------------------------------
Woodward Governor Company                                                                     8,650            D
Common Stock
------------------------------------------------------------------------------------------------------------------------------------
Woodward Governor Company                                                                     5,032            I          Stock Plan
Common Stock
------------------------------------------------------------------------------------------------------------------------------------
Woodward Governor Company           06/06/02       P              210        A      $56.42    1,290            I          IRA
Common Stock
------------------------------------------------------------------------------------------------------------------------------------

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

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

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

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


------------------------------------------------------------------------------------------------------------------------------------
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.                   (Over)
* If the form is filed by more than one reporting person, SEE Instruction 4(b)(v).                                 SEC 1472  (02-02)

                              POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION
                              CONTAINED IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM
                              DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.

</Table>

<Page>

<Table>
<Caption>

FORM 4 (CONTINUED)          TABLE II - DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED
                                   (E.G., PUTS, CALLS, WARRANTS, OPTIONS, CONVERTIBLE SECURITIES)

------------------------------------------------------------------------------------------------------------------------
1. Title of Derivative Security     2. Conver-   3. Trans-   4. Transac-   5. Number of Deriv-      6. Date Exer-
   (Instr. 3)                          sion or      action      tion Code     ative Securities Ac-     cisable and Ex-
                                       Exercise     Date        (Instr. 8)    quired (A) or Dis-       piration Date
                                       Price of    (Month/                    posed of (D)             (Month/Day/
                                       Deriv-       Day/                      (Instr. 3, 4, and 5)     Year)
                                       ative        Year)
                                       Security

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

                                                                                                     Date      Expira-
                                                             --------------------------------------  Exer-     tion
                                                                                                     cisable   Date
                                                              Code    V        (A)        (D)
<S><C>
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $16.625      01/10/1996                                     11/18/1996   01/17/2006
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $23.50       11/18/1996                                     11/18/1996   11/17/2006
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $32.25       11/17/1997                                     11/17/1997   11/16/2007
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $32.00       01/14/1998                                     01/14/1998   01/13/2008
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $22.00       11/16/1998                                     11/16/1998   11/15/2008
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $24.75       11/16/1999                                     11/15/2000   11/15/2009
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $41.813      11/21/2000                                     11/20/2001   11/20/2010
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $49.00       10/01/2001                                     09/30/2002   09/30/2011
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Phantom                              1-for-1      11/23/2001                                    (1)           (1)
Stock Units
------------------------------------------------------------------------------------------------------------------------

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

<Caption>

------------------------------------------------------------------------------------------
7. Title and Amount of Under-       8. Price   9. Number     10. Owner-     11. Nature
   lying Securities                    of         of Deriv-      ship           of In-
   (Instr. 3 and 4)                    Deriv-     ative          Form           direct
                                       ative      Securi-        of De-         Bene-
                                       Secur-     ties           rivative       ficial
                                       ity        Bene-          Secu-          Own-
                                       (Instr.    ficially       rity:          ership
                                       5)         Owned          Direct         (Instr. 4)
                                                  at End         (D) or
                     Amount or                    of             Indi-
       Title         Number of                    Month          rect (I)
                     Shares                       (Instr. 4)     (Instr. 4)
<S><C>
------------------------------------------------------------------------------------------
Common Stock       30,960(a)                      30,960            D
------------------------------------------------------------------------------------------
Common Stock       53,600(b)                      84,560            D
------------------------------------------------------------------------------------------
Common Stock       57,794(b)                     142,354            D
------------------------------------------------------------------------------------------
Common Stock       21,721(b)                     164,075            D
------------------------------------------------------------------------------------------
Common Stock       50,000(b)                     214,075            D
------------------------------------------------------------------------------------------
Common Stock       35,000(b)(c)                  249,075            D
------------------------------------------------------------------------------------------
Common Stock       40,000(b)(c)                  289,075            D
------------------------------------------------------------------------------------------
Common Stock       50,000(b)(c)                  339,075            D
------------------------------------------------------------------------------------------
Common Stock       86,725           $49.06       425,800            D
------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------
Explanation of Responses:   (a) Stock options originally granted on January 17, 1996 under the Woodward Governor
Company 1996 Long-Term Incentive Compensation Plan remaining upon partial attainment of performance goals for
Fiscal Year 1996.
(b) Grant to reporting person of option to buy shares of common stock under the Woodward Governor Company 1996
Long-Term Incentive Compensation Plan is an exempt transaction under Rule 16b-3.
(c) Shares become exercisable at the rate of 25% per year beginning one year from date of grant.
(1) The phantom stock units were accrued under the Woodward Governor Company Unfunded Deferred Compensation
Plan No. 2 and are to be settled in 100% cash upon separation from the Company.



                        /s/ John A. Halbrook              July 8, 2002
                     -----------------------------------  ------------
                       **Signature of Reporting Person        Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly

        * If the form is filed by more than on reporting person, SEE Instruction 4(b)(v).

       ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations.
          SEE 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

    Note: File three copies of this Form, one of which must be manually signed. If space is insufficient,
          SEE Instruction 6 for procedure.


                                                                                                                   SEC 1472 (02-02)
</Table>
[{"type": "4", "sequence": "1", "filename": "form4_halbrook06rev.txt", "description": "HALBROOK06LIVE", "secsgml_size_bytes": 15256}]
--------                                  UNITED STATES SECURITIES AND EXCHANGE COMMISSION             -----------------------------
 FORM 4                                                WASHINGTON, D.C. 20549                                   OMB APPROVAL
--------                                                                                               -----------------------------
/ / CHECK THIS BOX IF NO                    STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP                OMB NUMBER:       3235-0287
    LONGER SUBJECT TO                                                                                   EXPIRES:   January 31, 2005
    SECTION 16.  FORM 4 OR    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,   ESTIMATED AVERAGE BURDEN
    FORM 5 OBLIGATIONS MAY       Section 17(a) of the Public Utility Holding Company Act of 1935 or     HOURS PER RESPONSE .... 0.5
    CONTINUE.  SEE                       Section 30(f) of the Investment Company Act of 1940           -----------------------------
    INSTRUCTION 1(b).
(Print or Type Responses)
------------------------------------------------------------------------------------------------------------------------------------
1. Name and Address of Reporting Person*     2. Issuer Name AND Ticker or Trading Symbol     6. Relationship of Reporting Person(s)
                                                                                                to Issuer (Check all applicable)
                                                                                                /X/  Director
   Halbrook         John            A.          Woodward Governor Company      WGOV             /X/  Officer, Include title
---------------------------------------------------------------------------------------------        Chairman, Chief Executive
    (Last)        (First)        (Middle)    3. IRS or Social Security  4. Statement for             Officer and President
                                                Number of Reporting        Month/Year           / /  10% Owner
                                                Person (Voluntary)                              / /  Other, specify
         5001 North Second Street                                            06/2002           -----------------  ------------------
--------------------------------------------                            --------------------- 7. Individual or Joint/Group Filing
                  (Street)                                              5. If Amendment,          (Check Applicable Line)
                                                                    Date of Original   /X/  Form filed by One Reporting Person
                                                                           (Month/Year)       / /  Form filed by More than One
   Rockford         IL              61111                                                          Reporting Person
------------------------------------------------------------------------------------------------------------------------------------
    (City)       (State)            (Zip)        TABLE I - NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED
------------------------------------------------------------------------------------------------------------------------------------
1. Title of Security               2. Trans-   3. Trans-     4. Securities Acquired (A)    5. Amount of     6. Owner-   7. Nature
   (Instr. 3)                         action      action        or Disposed of (D)            Securities       ship        of In-
                                      Date        Code          (Instr. 3, 4 and 5)           Beneficially     Form:       direct
                                                  (Instr. 8)                                  Owned at         Direct      Bene-
                                     (Month/                                                  End of           (D) or      ficial
                                      Day/     -------------------------------------------    Month            Indirect    Owner-
                                      Year)                               (A) or                               (I)         ship
                                                Code    V       Amount    (D)     Price       (Instr. 3        (Instr. 4) (Instr. 4)
                                                                                              and 4)
------------------------------------------------------------------------------------------------------------------------------------
Woodward Governor Company                                                                     8,650            D
Common Stock
------------------------------------------------------------------------------------------------------------------------------------
Woodward Governor Company                                                                     5,032            I          Stock Plan
Common Stock
------------------------------------------------------------------------------------------------------------------------------------
Woodward Governor Company           06/06/02       P              210        A      $56.42    1,290            I          IRA
Common Stock
------------------------------------------------------------------------------------------------------------------------------------

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

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

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

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

------------------------------------------------------------------------------------------------------------------------------------
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.                   (Over)
* If the form is filed by more than one reporting person, SEE Instruction 4(b)(v).                                 SEC 1472  (02-02)

                              POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION
                              CONTAINED IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM
                              DISPLAYS A CURRENTLY VALID OMB CONTROL NUMBER.
FORM 4 (CONTINUED)          TABLE II - DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED
                                   (E.G., PUTS, CALLS, WARRANTS, OPTIONS, CONVERTIBLE SECURITIES)

------------------------------------------------------------------------------------------------------------------------
1. Title of Derivative Security     2. Conver-   3. Trans-   4. Transac-   5. Number of Deriv-      6. Date Exer-
   (Instr. 3)                          sion or      action      tion Code     ative Securities Ac-     cisable and Ex-
                                       Exercise     Date        (Instr. 8)    quired (A) or Dis-       piration Date
                                       Price of    (Month/                    posed of (D)             (Month/Day/
                                       Deriv-       Day/                      (Instr. 3, 4, and 5)     Year)
                                       ative        Year)
                                       Security

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

                                                                                                     Date      Expira-
                                                             --------------------------------------  Exer-     tion
                                                                                                     cisable   Date
                                                              Code    V        (A)        (D)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $16.625      01/10/1996                                     11/18/1996   01/17/2006
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $23.50       11/18/1996                                     11/18/1996   11/17/2006
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $32.25       11/17/1997                                     11/17/1997   11/16/2007
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $32.00       01/14/1998                                     01/14/1998   01/13/2008
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $22.00       11/16/1998                                     11/16/1998   11/15/2008
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $24.75       11/16/1999                                     11/15/2000   11/15/2009
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $41.813      11/21/2000                                     11/20/2001   11/20/2010
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Nonqualified                         $49.00       10/01/2001                                     09/30/2002   09/30/2011
Stock Option
(right to buy)
------------------------------------------------------------------------------------------------------------------------
Phantom                              1-for-1      11/23/2001                                    (1)           (1)
Stock Units
------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------
7. Title and Amount of Under-       8. Price   9. Number     10. Owner-     11. Nature
   lying Securities                    of         of Deriv-      ship           of In-
   (Instr. 3 and 4)                    Deriv-     ative          Form           direct
                                       ative      Securi-        of De-         Bene-
                                       Secur-     ties           rivative       ficial
                                       ity        Bene-          Secu-          Own-
                                       (Instr.    ficially       rity:          ership
                                       5)         Owned          Direct         (Instr. 4)
                                                  at End         (D) or
                     Amount or                    of             Indi-
       Title         Number of                    Month          rect (I)
                     Shares                       (Instr. 4)     (Instr. 4)
------------------------------------------------------------------------------------------
Common Stock       30,960(a)                      30,960            D
------------------------------------------------------------------------------------------
Common Stock       53,600(b)                      84,560            D
------------------------------------------------------------------------------------------
Common Stock       57,794(b)                     142,354            D
------------------------------------------------------------------------------------------
Common Stock       21,721(b)                     164,075            D
------------------------------------------------------------------------------------------
Common Stock       50,000(b)                     214,075            D
------------------------------------------------------------------------------------------
Common Stock       35,000(b)(c)                  249,075            D
------------------------------------------------------------------------------------------
Common Stock       40,000(b)(c)                  289,075            D
------------------------------------------------------------------------------------------
Common Stock       50,000(b)(c)                  339,075            D
------------------------------------------------------------------------------------------
Common Stock       86,725           $49.06       425,800            D
------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------
Explanation of Responses:   (a) Stock options originally granted on January 17, 1996 under the Woodward Governor
Company 1996 Long-Term Incentive Compensation Plan remaining upon partial attainment of performance goals for
Fiscal Year 1996.
(b) Grant to reporting person of option to buy shares of common stock under the Woodward Governor Company 1996
Long-Term Incentive Compensation Plan is an exempt transaction under Rule 16b-3.
(c) Shares become exercisable at the rate of 25% per year beginning one year from date of grant.
(1) The phantom stock units were accrued under the Woodward Governor Company Unfunded Deferred Compensation
Plan No. 2 and are to be settled in 100% cash upon separation from the Company.

                        /s/ John A. Halbrook              July 8, 2002
                     -----------------------------------  ------------
                       **Signature of Reporting Person        Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly

        * If the form is filed by more than on reporting person, SEE Instruction 4(b)(v).

       ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations.
          SEE 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

    Note: File three copies of this Form, one of which must be manually signed. If space is insufficient,
          SEE Instruction 6 for procedure.

                                                                                                                   SEC 1472 (02-02)