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* Thomas J. Perkins, co-founder of venture capital firm Kleiner Perkins Caufield & Byers, resigned as a director of Hewlett-Packard Co., reducing the board to 10 members.

* Quest Diagnostics Inc. said it received a subpoena from the California attorney general’s office for documents related to billing to the state’s Medicaid program.

* Triad Hospitals Inc. plans to offer its doctors equity stakes in most of its 51 hospitals around the country.

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