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CFO in a startup here.
Honestly, from what I can see, it does not seem like a great move to me. A lot of this would depend on your personal circumstances as well (e.g. single/married/kids, age, risk appetite). But here are the cons as I see them.
- It’s moving away from an area you’re interested in
- Less (immediate) money
- IMO career path will be slower than if you’re in a smaller firm. Mid-management in a large firm is the worst
Since you’re already CIO, to further your career I would either try and grow the company or join a growing company (you could get less pay but get equity). If you join a large bank in my experience the career doesn’t go anywhere exciting.