Apple marketing chief Phil Schiller made the rounds Wednesday, speaking to The Wall Street Journal, Bloomberg and Reuters, criticizing Google's Android operating system, saying it's "fragmented," just as Samsung, Apple's chief competitor, gets set to unveil its Galaxy S4 Thursday evening. Schiller continued to disparage Android and Samsung regarding the new phone to Reuters.
(Read More: Expect the New Samsung Galaxy to Look Familiar)
"And that extends to the news we are hearing this week that the Samsung Galaxy S4 is being rumored to ship with an OS that is nearly a year old," Schiller said. "Customers will have to wait to get an update."
Google shares were lower in Thursday trading, off 0.35 percent to $822.45.
Amazon shares fell 2.9 percent to $267.13 following a downgrade from JPMorgan, citing worries over gross profit.
Analyst Doug Anmuth cut his rating on shares to "neutral" from "overweight" and lowered his price target to $300, as he believes there will be material deceleration in gross profit this year. Anmuth noted gross profit has become important because it is a proxy for revenue growth. In a note, Anmuth said gross profit will slow to 31 percent year over year as third-party sales moderate, first-party margins fall, and Amazon faces tougher comparables this year.
"We continue to believe that Amazon will gain share of overall eCommerce and become a much bigger company over time, but think the risk/reward at current levels is more balanced given slower unit trends and what we believe will be moderating gross profit growth going forward," Anmuth wrote.
CBS shares rose 2.33 percent $47.01 as the company announced an app for Apple's iOS to stream full episodes of certain CBS shows.
The CBS App is available for immediate download, and features certain shows, such as "NCIS," "The Good Wife," "CSI: Crime Scene Investigation," "How I Met Your Mother" and others. Daytime and late night programming, including "The David Letterman Show," will be available within 24 hours after initial airing, while prime-time shows will be available eight days after broadcast.
"We have been methodically and strategically finding new ways to satiate the appetite for our content on new platforms, while tapping into the tremendous revenue provided by doing so," said Leslie Moonves, president and CEO of CBS.
UBS raised its price target on the content provider to $54 from $45, citing CBS' ability to buy back one-third of its shares over the next few years, due to outdoor transactions and the company's free cash flow.