A new report says Unity is cutting around 1,800 jobs, or about 25 percent of the its employees, according to a regulatory filing and internal company memo obtained by Reuters on Monday.

This is reportedly the largest round of layoffs in the software company’s history—far larger than what happened in November of last year—and it will be completed by the end of March. Unity has gone through three prior rounds of layoffs within the last 12 months.

“We are … reducing the number of things we are doing in order to focus on our core business and drive our long-term success and profitability,” interim CEO Jim Whitehurst wrote in an internal memo obtained by Reuters. The memo was sent to all Unity employees on January 8.