Millipore's statement comes two days after Bloomberg reported that Thermo Fisher Scientific had made a $6 billion bid for the firm.
Millipore confirmed that it has hired Goldman Sachs as its financial advisor and Cravath, Swaine & Moore as its legal advisor to assist the board in its evaluation.
Millipore also said that it has not set a timetable for completing the evaluation and cannot assure that it will lead to any transaction.
In early Wednesday trade on the New York Stock Exchange, shares of Millipore were up 3 percent at $91.50. Its shares are up 28 percent for the week.