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Based on your description, the only way that he could assert an exclusive right to the list is if purchased the rights to it from your original mutual employer.
Based on your description, the party that would have the legal right to the list would be the bank, since the list was generated as, ostensibly, a service provide to certain bank customers, during the term of each of your employment.
I stated "purchased" the rights above, but I should clarify that to say "obtained" the rights from the bank. That could occur through some kind of agreement during his employment or upon separation.
However, without those rights, neither of you would have a better claim to ownership than the other.
Thus, going forward, I would demand to see proof of assignment of ownership from the company prior to relinquishing the point.
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Not that I know of as far the ownership rights. Thank you!
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