ServiceNow just posted 20% revenue growth and raised guidance for the year. So why has the stock has fallen nearly 13% this year? Is ServiceNow overvalued or a bargain?

ServiceNow reported third-quarter results on Wednesday that blew past Wall Street's expectations and its board approved a five-for-one stock split.

ServiceNow just posted 20% revenue growth and raised guidance for the year. So why has the stock has fallen nearly 13% this year? Is ServiceNow overvalued or a bargain?