Ogilvy Group has adopted a “poison pill”...

Ogilvy Group has adopted a “poison pill” anti-takeover plan, which would make a takeover prohibitively expensive. The move caused shares of Ogilvy, the sixth-largest U.S. advertising agency, to drop $1.25 to $31.25 on the NASDAQ market after it announced that its board passed the plan at a special meeting. Ogilvy stock had risen sharply in recent days on takeover talk. But the New York company, whose main subsidiary is Ogilvy & Mather Worldwide, said it knew of no suitors.