Direct Edge, the fourth largest U.S. equities market has signed a memorandum of understanding with Plus Markets, a London-based small-cap exchange, Financial News reports.

The deal could allow U.S.-based customers to trade some of the 7,500 equities available on Plus, and U.K. customers to trade Direct Edge's U.S. securities.

Direct Edge is a broker-owned trading system that executes about 10% of all U.S. equities trades. Other transatlantic deals between exchanges in recent years include U.S.’s Nasdaq's acquisition of Nordic stock exchange, OMX and the NYSE’s deal to buy European exchange group, Euronext.

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