The Dedham retailer iParty Corp. said its stock, which has traded at 25 cents or less for a year, could be delisted if it doesn’t take action to raise the share price by May 20, 2013.

The seller of party goods said Friday that it has received a letter from the New York Stock Exchange market officials saying that iParty stock is not in compliance with exchange guidelines due to its “low selling price for a substantial period of time.”