PLEASANTON -- Cloud software company Workday brought in more than $600 million in its initial public offering, then saw its stock shoot up more than 70 percent in its first day of public trading Friday. Company executives and analysts had plenty to say about the striking debut.

-- "It's a great validation of all the hard work that our employees have put in over the last seven years. Everybody is excited about this." - Aneel Bhusri, Workday's co-founder and co-CEO, in a telephone interview with the Mercury News.

-- "This is just a step along the way. This is just the start of the shift from the enterprise world to the cloud world. There is a lot more work to do. A lot more to accomplish," - Bhusri

-- "The additional money from the IPO will help us grow and expand. We have been hiring on a fairly aggressive clip and we expect that to continue. We expect to hire about 400 to 500 people by the end of 2013." - Workday Chief Financial Officer Mark Peek, in a telephone interview with the Mercury News.

-- "In all, a winning day for Workday, its investors and employees." - Sam Hamadeh, of independent data analysis firm PrivCo, in an email to the Mercury News.

-- "Today's trading evidences a "Duffield Premium" in Workday, where the Workday Co-Founder David Duffield (who sold his former HR software company PeopleSoft to Oracle (