Aetna Chairman And CEO Adopts 10b5-1 Plan

HARTFORD, Conn., August 8, 2007 — Aetna (NYSE: ΑET) announced today that Ronald A. Williams, the company’s chairman and CEO, has adopted a prearranged trading plan in accordance with guidelines specified by Rule 10b5-1 under the Securities and Exchange Act of 1934, and the company’s policies with respect to insider sales.

Rule 10b5-1 permits officers and directors of public companies to adopt pre-determined plans for selling specified amounts of stock. The plans may be entered into only when the officer or director is not in possession of material, nonpublic information and may be used to gradually diversify investment portfolios over a period of time.

Under Williams’ Rule 10b5-1 plan, he will systematically exercise employee stock options beginning in the third quarter of 2007 and sell 800,000 shares as part of his personal financial planning. This represents approximately 9 percent of Williams’ current equity interests in the company.

Aetna is one of the nation’s leading diversified health care benefits companies, serving approximately 34.9 million people with information and resources to help them make better informed decisions about their health care. Aetna offers a broad range of traditional and consumer-directed health insurance products and related services, including medical, pharmacy, dental, behavioral health, group life, long-term care and disability plans, and medical management capabilities. Our customers include employer groups, individuals, college students, part-time and hourly workers, health plans and government-sponsored plans.

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