Investors boosted their stock-market bets in May for the first time in 4 months, TD Ameritrade says

· *TD Ameritrade clients boosted their stock-market exposure for the first time in four months, a May update to the firm's Investor Movement Index showed Monday.*
· *The index jumped to 4.35 last month from 3.9 as net buying activity ended a downturn and matched the market's broad rally.*
· *Travel companies Southwest...