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July 2 (Reuters) - Convenience store retailer Cumberland Farms filed for an initial public offering in the U.S. on Thursday, adding to a busy summer for new stock market entrants as favorable market conditions spur a steady pipeline of new listings.

After years of muted activity driven by higher interest rates and market volatility, the U.S. IPO market has reopened broadly, with companies from a wider range of industries returning to public markets.

Cumberland Farms, which operates more than 3,200 sites across the U.S. and Europe, is aiming to trade on the Nasdaq, under the ticker symbol "CMBY."

BofA Securities, Goldman Sachs and Jefferies are the lead underwriters of the IPO.