Just after the acquisition by Vista, 11% was laid-off. The initial target was 20%. but they did 11% so that the rest would leave on their own.
After that, layoffs happened every quarter. Now, they sold TIBCO's HQ and almost 30% of the US workforce is left. Almost everything is offshore.
PE firms come and reduce the headcount to improve profit margins. Also one more thing - Vista group of companies do an IQ and personailty test as soon as they take over a company. They said the test didn't have any say in the layoffs - but I am not so sure.
So be ready for layoffs. Start prep for interviews but don't leave without a package.