You're company decided to give you a pay cut. They wrapped that present around reasons like a buy out, but that's what they did. Who cares if it's your new management or old management, it's your employer and that was what they chose to do.

It's no different than if they said hey, we're going to pay you less money every paycheck, because <reasons>.

All you can do is ask if your remaining pay is worth the work you do.

This is why legitimate companies vest quarterly or more frequently. Your 0.01% equity stake is does not make you a powerful investor.

Holy crap that would suck, how many staff did they loose when they decided to screw with peoples pay like that?

I would think, as a company, you would just be shooting yourself in the foot unless you did something like increased base-pay to cover the loss of RSUs.