Quantum is trading 10.11% down at $27.35 as investors weigh the October 9 termination of CFO William White and the appointment of Chief Accounting Officer Hiral Patel as principal financial officer. - Quantum gave no reason for White’s departure. - The company expects to meet or exceed fiscal second-quarter guidance, anticipates filing its 10-Q on time, and says operations should not be disrupted. - Broader indices were mixed, providing no clear market-wide explanation for the selloff.