(Nov. 17, 12:55 p.m.) Stop & Shop Supermarket Co. is expected to purchase two leases for Grant Union Family Market stores in Provincetown and Seekonk, Ma.

The supermarket chain, which is owned by Zaandam, Netherlands-based Royal Ahold NV, is planning to close the stores in early December for conversion into Stop & Shops, and then to reopen them in time for the holidays.

Rob Keane, media relations manager, said the turnaround should take about a week.

“This is an area that we haven’t really served,” he said.

The Provincetown store has a pharmacy, which Stop & Shop plans to keep open during the conversion and afterward.

The acquisition of these two stores should bring the chain up to 377 stores total throughout Massachusetts, Connecticut, Rhode Island, Maine, New Hampshire, New York and New Jersey.

Grand Union Family Market operates 32 stores in New York, Vermont, Massachusetts, Connecticut and Pennsylvania, according to its Web site, www.gufamilymarkets.com, and is headquartered in Ausable Forks, N.Y.

Keane said the company is offering Stop & Shop positions to associates of the Grand Union Family Markets.

Stop & Shop is also in the midst of redesigning its stores with a new logo and format changes that started in late August. By the end of the decade, all Stop & Shop stores should implement the new logo and the redesigned store platforms.