Palantir declined as much as 18% on Wednesday after the high-flying tech firm was downgraded to "Under-weight" by Morgan Stanley.  An "Under-weight" rating is equivalent to a Sell rating on Wall Street. The downgrade came after Morgan Stanley downgraded Palantir to "Equal-weight" from "Over-weight" last month.
Palantir plummets 18% after Morgan Stanley downgrades company on questionable valuation following massive run