Piper Jaffray Cos. has completed its purchase of Weeden & Co. LP, a Greenwich, Conn.-based broker/dealer focused on providing institutional clients with global trading solutions.

Weeden & Co. will now convert to and operate as Piper Jaffray & Co.

Weeden & Co. CEO Lance Lonergan will lead the combined trading platform and be Piper Jaffray's head of global equity execution.

The Minneapolis-based investment bank expects its combination with Weeden & Co. and its recently announced merger with New York-based Sandler O'Neill & Partners LP to boost its equities business.