 FOLSOM, Calif.--BUSINESS WIRE--PowerSchool NYSE: PWSC today announced that the underwriters of its initial public offering have exercised in full their option to purchase from PowerSchool an additional 5,921,052 shares of its Class A common stock at the initial public offering price, less underwriting discounts and commissions. The sale of these additional shares of Class A common stock closed on August 10th, following the closing on July 30th of the sale of 39,473,685 shares of PowerSchool 