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Shares of Twitter are far too overvalued to own, especially given implied growth expectations for the social media company, Cantor Fitzgerald Managing Director Youssef Squali said Wednesday.
"What we're coming up with is the fact that it is almost impossible, really, for management to be able to hit those numbers within the time frame" that investors are going to expect, he said.
Squali downgraded Twitter stock to sell, with a price target of $32 a share.
(Read more: Apple dominates retail trading in 2013: TD survey)
He based the rating on a review of the company's fundamentals, Squali told CNBC's "Halftime Report. "
"Frankly, I would hate to be Twitter's CFO right now, looking at reporting earnings in about a month's time and having to justify valuation at this level and give new investors reason to pile up here," he added.
Josh Brown of Ritholtz Wealth Management took issue with the downgrade.
(Read more: It's past time to short gold, Dennis Gartman says)
"Why was it a buy rating before today? There's no consistency as to the timing other than, 'Hey, it's a new year. Let's reset expectations.' It's a smart political move by the analyst," he said. "I don't think it really carries much weight as far as a change of an opinion. [Twitter] has always been overvalued."
Brown said that he owns shares of Twitter.
"I hope it gets killed after they report. I'll double my position," he said. "I just don't think that it will."
OptionMonster's Jon Najarian still saw upside for Twitter.
(Read more: Top 3 cheap stocks for 2014: Pro)
"I intend to hold it for a couple of months," he said. "Feb. 5 is going to loom large for my portfolio, as far as this earnings announcement."
Mike Murphy also remained a long-term bull on Twitter.
"I think there's going to come a time where people throw in the towel on Twitter when there's some sort of hiccup, and you're going to see a major hit in the stock," he said. "Because there is real growth there, there's a reason to own the company."