In part. Biden mandated that all fed contractors have to have the vaccines and that (as I understand it) still stands. You might think that just hits people in companies like Raytheon that do government work as their core business. Not so. for example Southwest Airlines said they had to do it because they have contracts to transport government personnel. Nowhere near their core business but they do have contracts with US government so ...
It has tendrils into many, many industries and it's still a thing.