ServiceNow (NOW 2.29%) stock is moving higher in Tuesday's trading. The software specialist's share price was up 1.9% as of 2:30 p.m. ET, and been up as much as 3.1% earlier in the day.Two investment firms updated their valuation forecasts for ServiceNow today and lowered their respective price targets on the stock. But despite the downward forecast revisions, investors are buying shares because the new targets still suggest significant upside potential.Two analyst firms stay bullish on ServiceNow despite t ...