Pepco Holdings Inc. (POM)

[Timothy Smith]

Pepco (POM -17.9%) plunges after the District of Columbia Public Service Commission votes against its merger with Exelon (EXC -3.4%), saying the combination is not in the public interest and that the companies failed to prove beneficial to customers.

The D.C. commission was the final approval needs to complete the proposed $6.4B merger, announced in April 2014.