Keystone Acquisition Corp. (NASDAQ:KEYYU – Get Free Report) was the target of a large decline in short interest during the month of July. Keystone Acquisition Stock PerformanceShares of Keystone Acquisition stock traded up $0.06 during trading hours on Tuesday, reaching $10.20. Keystone Acquisition has a one year low of $10.00 and a one year high of $10.47. Get Keystone Acquisition alerts:Analyst Ratings ChangesSeparately, Wall Street Zen upgraded Keystone Acquisition to a “hold” rating in a research note on Saturday, June 6th. See AlsoReceive News & Ratings for Keystone Acquisition Daily - Enter your email address below to receive a concise daily summary of the latest news and analysts' ratings for Keystone Acquisition and related companies with MarketBeat.com's FREE daily email newsletter.