A lot of people I know have been checking the state WARN notices. Conveniently, Schwab hasn't popped up. Below is from the Department of Labor's WARN Act FAQ:
"The WARN Act requires employers with 100 or more full-time employees (not counting workers who have fewer than 6 months on the job) to provide at least 60 calendar days advance written notice of a worksite closing affecting 50 or more employees, or a mass layoff affecting at least 50 employees and 1/3 of the worksite’s total workforce or 500 or more employees at the single site of employment during any 90-day period. Not all dislocations require a 60-day notice; the WARN Act makes certain exceptions to the requirements when employers can show that layoffs or worksite closings occur due to faltering companies, unforeseen business circumstances, and natural disasters. In such instances, the WARN Act requires employers to provide as much notice to their employees as possible. "
They key part in here is the "mass layoff affecting at least 50 employees and 1/3 of the worksite’s total workforce" the "and" between the 50 employees and the 1/3 of the worksite's workforce is saying that if they lay off 32% of the workforce, WARN doesn't apply to them. It's by worksite (aka, each campus and branch). So they can lay off 499 people and not have to follow WARN. Rinse and repeat for all campuses.