Roblox stock drops after pulling down China app for retooling – MarketWatch Roblox Corp. shares dropped Friday following a report that the social-gaming company’s app in China will be unavailable for an undetermined period after being shut down in December. Roblox [RBLX, -5.41%](/investing/stock/RBLX?mod=MW_story_quote) shares fell as much as 7% in Friday trading and were last down 5% at $84.59. Shares are more than 80% higher than the $45 reference price established when the company went public in March , but nearly 40% lower than their peak close of $134.72 in mid-November. Back in December, Roblox pulled its app for a...