Would love to see specific numeric information on offer packages, negotiations, counter-offers, and final accepted offer, if the author feels comfortable disclosing such information.
I bet you can get a really nice offer when you get six big tech companies to bid over you.
You can probably negotiate toward the top of each pay band, but that's about it. I'm assuming the OP was an L4, you can research the pay bands for that level.
Salary is restricted to pay band, but RSUs are not, at least not at my company anyway. I've heard of some pretty insane RSU grants well beyond what would be typical for a given pay band (absent negotiation).
I bet you can get a really nice offer when you get six big tech companies to bid over you.