Despite a nearly 50-percent surge throughout 2017, at least one Wall Street analyst isn't confident that Gap Inc GPS's momentum will continue. The Analyst Oppenheimer's Anna Andreeva downgraded Gap from Outperform to Perform with a price target lowered from $33 to $30. The Thesis One of the requirements for the retailer's stock to continue growing is sales consistency across all three of its major brands — Gap, Old Navy and Banana Republic — Andreeva said in the downgrade note. Read moreThere is a breakout of the rising channel so we can expect further upside. $GPS, Gap, Inc. (The) / D