Key Takeaways Shares of Sphere Entertainment, the parent company behind the Las Vegas Sphere, fell Tuesday morning after announcing an unexpected executive change. CFO David Byrnes "will be leaving the company," Sphere said, but did not give a reason. Byrnes has held the position since last December. Sphere Entertainment (SPHR) stock fell Tuesday morning after announcing the unexpected departure of Chief Financial Officer (CFO) David Byrnes, who "will continue in his current role for an interim period to fa ...