X0303 4 2009-07-15 1 0001094739 FINISAR CORP FNSR 0001273984 BUSE DAVE 1389 MOFFETT PARK DRIVE SUNNYVALE CA 94089-1134 1 Sr. VP/GM Network Tools Common Stock 2009-07-15 2009-07-15 4 F 0 6561 0.516 D 40139 D On July 15, 2009, the Reporting Person vested in 18,350 restricted stock units ("RSUs") and as a result acquired 18,350 shares of common stock of the Issuer pursuant to the Reporting Person's March 10, 2009 grant of RSUs. This Form 4 reports the disposition of shares withheld by the Issuer pursuant to the RSUs' grant agreement in order to satisfy the Reporting Person's withholding obligations for various taxes due upon the vesting of the RSUs. The Issuer will pay the taxes on behalf of the Reporting Person. David Buse 2009-07-17