Pluralsight, the Utah-based education startup popular with technology professionals, has filed confidentially for an IPO, the company announced on Monday.

Pluralsight confirms that its knowledge base to comes from some 1,500+ expert authors feeding into what are over 6,500 learning courses.

Pluralsight has kept the IPO window for software companies wide open as the Utah ed tech company's shares rose 33% in its first day of trading.