[Silhouette]

Unfortunately, it sounds like the current company culture is toxic and most likely beyond hope of redemption. Unless you have

(a) enough influence with the company leadership to make a real difference to the culture in the immediate future

AND

(b) the company has good prospects if only the management issues could be resolved

AND

(c) the risk of staying is balanced by a huge potential upside for you personally (such as already having a potentially life-changing level of equity AND a bulletproof contract)

then I would suggest you make plans to leave as well. Loyalty is a fine character trait, but so is pragmatism. There's no need to burn bridges or screw anyone, just find a better option, give a reasonable amount of notice, and do what you reasonably can to hand over to whoever is taking over your responsibilities for as long as you're still there.