PRINCIPAL SECURITY HOLDERS

The following table sets forth information concerning those persons known to the Company to be the beneficial owners of more than 5% of the common stock of the Company.

Name and Address of Beneficial Owner Amount and Nature
Of Beneficial
Ownership
October 18, 2007		  

Percent
of Class
Allianz Global Investors of America LP      1,446,6601            8.6 % 
680 Newport Center Dr. Suite 250
Newport Beach, CA 92660
NWQ Investment Management Co, LLC   1,166,4032     6.9 % 
2049 Century Park East 16th Floor
Los Angeles, CA 90067
Barclays Global Investors UK Holdings Limited   1,007,6783     6.0 % 
1 Churchill Place
Canary Wharf
London, England
Mario L. Crivello   898,5934     5.3 % 
San Diego, CA
  1. As of June 30, 2007, Allianz Global Investors of America LP (“Allianz”) filed a report on Form 13F with the Securities and Exchange Commission to report beneficial ownership of 1,446,660 shares. Allianz reported shared investment discretion with respect to all shares, sole voting authority with respect to 373,200 shares, shared voting authority with respect to 1,048,060 shares and no voting authority with respect to 25,400 shares. Beneficial ownership information as of October 17, 2007 is unavailable.
  2. As of June 30, 2007, NWQ Investment Management Co., LLC (“NWQ”) filed a report on Form 13F with the Securities and Exchange Commission to report beneficial ownership of 1,166,403 shares. NWQ reported shared investment discretion with respect to all shares, shared voting authority with respect to 990,252 shares and no voting authority with respect to 176,151 shares. Beneficial ownership information as of October 17, 2007 is unavailable.
  3. As of June 30, 2007, Barclays Global Investors UK Holdings Limited (“Barclays”) filed a report on Form 13F with the Securities and Exchange Commission to report beneficial ownership of 1,007,678 shares. Barclays reported shared investment discretion with respect to all shares, sole voting authority with respect to 874,300 shares and no voting authority with respect to 133,378 shares. Beneficial ownership information as of October 17, 2007 is unavailable.
  4. Mr. Crivello has sole voting and investment power over 766,404 shares held in trust for the benefit of others. He also has sole voting and investment power over 14,780 shares held as custodian for others and 101,609 shares held directly. Mr. Crivello also has the right to acquire 15,800 shares upon exercise of stock options.

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