AT&T downgrade, BridgeBio Pharma's heart treatment, PepsiCo shares slip: Trending stocks

AT&T shares dip following a Citi downgrade citing a Wall Street Journal report on the internet-cable provider's toxic lead cables. BridgeBio Pharma's stock jumps after positive data in its new heart treatment trials. Lastly, PepsiCo shares slide on a downgrade by Morgan Stanley analysts.