The company PluralSight raised $310 million in its initial public offering, pricing shares above the high end of its range. Pluralsight offers more than 6,700 courses. At the end of the first quarter the company had 14,830 business customers, and at the end of last year it had more than 695,000 end users. In the first quarter 82 percent of Pluralsight’s billings came from business customers.