Knight Capital Group board ended a day-long meeting Monday without a decision on the company's future, amid expectations that a bidding war between the brokerage's two suitors could still escalate, according to people involved in the talks.

Getco and Virtu Financial both made roughly hour-long presentations to the Jersey City, New Jersey-based brokerage's board on Monday, and answered questions about their firms and their differing visions for a merger with Knight, the people said.