UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT
                         Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934


        Date of Report (Date of earliest event reported): March 15, 2006


                              KEYNOTE SYSTEMS, INC.
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             (Exact name of registrant as specified in its charter)


                                    Delaware
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                 (State or other jurisdiction of incorporation)



       000-27241                                             94-3226488
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      (Commission                                          (IRS Employer
      File Number)                                         Identification No.)



   777 Mariners Island Boulevard, San Mateo, California               94404
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       (Address of principal executive offices)                    (Zip Code)



                                 (650) 403-2400
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              (Registrant's telephone number, including area code)



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          (Former name or former address, if changed since last report)


     Check the appropriate box below if the Form 8-K filing is intended to
     simultaneously satisfy the filing obligation of the registrant under any of
     the following provisions (see General Instruction A.2. below):

     [ ]   Written communications pursuant to Rule 425 under the Securities Act
           (17 CFR 230.425)

     [ ]   Soliciting material pursuant to Rule 14a-12 under the Exchange Act
           (17 CFR 240.14a-12)

     [ ]   Pre-commencement communications pursuant to Rule 14d-2(b) under the
           Exchange Act (17 CFR 240.14d-2(b))

     [ ]   Pre-commencement communications pursuant to Rule 13e-4(c) under the
           Exchange Act (17 CFR 240.13e-4(c))



Item 1.01         Entry into a Material Definitive Agreement.


     On March  15,  2006,  the  Board of  Directors  of  Keynote  Systems,  Inc.
("Keynote")  approved an amendment to Keynote's 1999 Equity  Incentive Plan (the
"Plan")  whereby  without  first  obtaining the consent of the  stockholders  of
Keynote the exercise price of outstanding  options may not be reduced.  The Plan
was further  amended  such that prior to the  issuance  of new options  having a
lower  exercise  price or other  awards  authorized  under the  Plan,  issued in
substitution for cancelled  options,  the consent of the stockholders of Keynote
is also required.





                                    SIGNATURE

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                 KEYNOTE SYSTEMS, INC.



Date: March 15, 2006             By:  /s/ Andrew Hamer
                                      ------------------------------------------
                                      Andrew Hamer
                                      Vice President and Chief Financial Officer