Is my employer selling my personal information?

I’ve lately been getting a lot of official-looking mail with my employer’s logo on it or something like “a special offer for employees of firm XYZ” with my company’s information in it. Only, turns out, it’s almost always advertisements for car insurance, life insurance, or other sales pitches that have nothing to do with my company or my work. Neither are these advertisements from the work-sponsored health insurance, but rather completely different third parties. So my question: how likely is …

employer information personal personal information privacy selling