You're not powerless. You can certainly fight back.
The whole point of the layoffs are to keep the already struggling Cigna stock value up. The goal of this is to please investors and because the CEO, David Cordani, is payed mostly in stocks (no really, look it up on the SEC website).
If you are an employee you might have a 401k. A 401k is a collection of stocks used for retirement. Your 401k likely has at least one fund invested mostly in Cigna stock. When you are layed off, or maybe even before, transfer those Cigna funds to something else/better. Your retirement account will be better invested and you have undone any stock benefit of them laying you off.