Qualcomm Inc’s (QCOM.O) President Derek Aberle, under pressure from activist hedge fund Jana Partners to improve the licensing and chip design firm’s stock performance, on Thursday sounded a cautionary note about a potential breakup of the company. Stressing that the board and management do not expect to complete a review of a possible split until the end of the year, Aberle told Reuters that Qualcomm agrees with Jana that its stock is undervalued.