B. Riley Financial, a diversified financial services company, withdrew its $231m offer for SPOK, which engages in the provision of communication solutions. "While we remain very interested in acquiring Spok, we are not willing to hold open an offer for an indeterminate amount of time while the Board rebuffs calls to explore strategic options for a company whose assets have languished under their oversight. As such, we are withdrawing our current proposal to acquire Spok," Bryant Riley, B. Riley Financial Chairman and Co-CEO.