Market Movers rounded up the latest reactions on Arm Holdings from investors and analysts. The pros, including Jim Cramer , discussed the British chip design company after it began trading publicly Thursday. The company's initial public offering was priced at $51 per share but shares opened at $56.10. SoftBank took Arm private in 2016 and still holds about 90% of its outstanding shares . Arm Chief Financial Officer Jason Child and Softbank CEO Masayoshi Son joined CNBC for an exclusive interview to discuss market expectations, artificial intelligence and more . Arm Holdings closed at $63.59.