The stock market, Medicare Advantage rates and 'political intelligence'

The Wall Street Journal: Tip On Policy Shift Jolted Health Shares
Alerted by a private message about a potential coming change in government health-care policy, certain investors earlier this week sparked a frenzy of trading in some of the industry's largest companies. The last-minute action, which drove the shares sharply higher before the close of trading, is throwing a spotlight on the controversial "political intelligence" industry, the subject of a report due Thursday by the investigative arm of Congress (Mullins and McGinty, 4/3).