MicroStrategy (MSTR -9.5%) dives after announcing: 1) Vice-chairman Sanju Bansal is being replaced as COO by services chief Bob Watts. 2) CTO Jeffrey Bedell has been replaced by engineering VP Peng Xiao. 3) Paul Zolfaghari, formerly COO at startup ParAccel, has been named President, along with legal chief Jonathan Klein. BMO is downgrading to Market Perform: it's unhappy with the COO change, and believes it could be a response to poor results. It also thinks the BI software market is slowing down - bad news for rivals QLIK and BIRT.