Archipelago Exchange (ArcaEx), the electronic equity trading arm of the US Pacific Exchange, has reached record trading volumes following the completion of its migration of over-the-counter (OTC) stocks from the Archipelago electronic communications network.

ArcaEx volume in OTC and listed trading reached nearly 500 million shares traded on May 27, with a record of more than 435 million OTC shares traded and nearly 60 million listed shares traded.