The possessive form for the noun finance is finance's. However, the term finance is a concept noun. The noun as a possessive would only be used as the study or field of finance.
* It is possible to use the plural noun "finances" to mean someone's personal financial dealings. In that case, the plural possessive could be used, as in His finances' collapse led to his breakdown. However, the adjective form is probably better (His financial collapse) or the avoidance of the possessive (The collapse of his finances).
Finance can already be used as a verb in the right context. For example "to finance something or someone" is an action and therefore a verb.
The possessive form for the singular noun dollar is dollar's.
The possessive form for the noun banker is banker's.
The possessive form of the singular noun equity is equity's.
The noun or verb finance has the derivative adjective form financial. The adverb form is financially.
The possessive form of the word dictionary is dictionary's.
The singular possessive form is word's, for example the word's definition.
possessive form for the word holders: holders'
the possessive form of the word Cathie: Cathie's
possessive form of the word Cathi: Cathi's
possessive form of the word Congress: Congress'
possessive form of the word glass: glass'
The possessive form of the word "month" is "month's."
The possessive form is Lindbergh's.
The possessive form is weaver's.
The possessive form for the interrogative pronoun who is whose.
The singular possessive form of jury is jury's