They often know what is going to happen soon after it has been decided. Sniff around and make up your own mind. Many of them are natural and desirable activities of healthy companies. As a group these people have more money and ego invested in the company than you. These are often a cover for early rounds of layoffs.
Personnel are most technology company's single largest expense item.
Any staff reduction can have a huge impact on the burn rate. These are indicators that the need for cash in the short term is so great that it's worth risking the long term health of the organization. From these you can devise a reasonable strategy. There are two ends to the strategy spectrum. They are hang on at all costs or bail out at the first sign of trouble.