Thousands of tech employees are reeling as the value of their stock compensation, which soared in the past two years, has come crashing back to earth in recent months.

Some companies whose stocks have fallen by half or more in the past year, including Zoom and DocuSign, are taking action to make up the difference for employees, including boosting cash retention bonuses or modifying the value of restricted stock units they previously granted, according to interviews and a regulatory filing. Others, including Robinhood and Netflix, may need to make similar moves or risk employee departures amid the tight labor market.