Aha! " In the other cases, "banks" are the subjects of the verbs. "banks entered" "banks focused" In the case in question, "market share" is subject of the verb.
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Avangi "the" modifies "market share," not "investment banks'."Pardon my ignorance, but I think 'market share' does not need any article as it is clearly defined by the possessive " investment banks' ".