CPO brings considerable industry experience and pedigree to the table. Startup has 2 founders and just closed Series A a few months ago.
Without knowing the specifics (how many years of experience, what kind of industry connects & their worth, current split between founders and other stake holders etc), it is difficult to estimate the equity share.
Depending on the above, a share anywhere between 10-20% should be good enough. This again varies with the monetary compensation the CPO is provided.
