Nymex Holdings is expected to issue $300m of shares to members of its metals futures division Comex, after an agreement on Thursday for Comex gold, silver and copper futures to trade electronically.

Nymex Holdings, owner of energy futures exchange, the New York Mercantile Exchange, said Comex’s 772 members would each receive 8,400 shares prior to the planned initial public offering of Nymex, which is expected in November.