During an interview on CNBC, Icahn reiterated that he hasn't sold a single share of Netflix but also noted that given the recent run-up, he "won't say it's a no-brainer" to buy.
While some traders interpreted Icahn's words to be bullish, StockTwits user Tstrar noted otherwise.
"$NFLX holding not buying is what Icahn is saying, get a grip," she said.
And gemczar21 added that "when Ichan dumps you will be the last to know."
Shares of Merck also advanced after the drug maker announced that it plans to cut 8,500 more jobs worldwide.