Kroger Co. said Tuesday that its home delivery service Kroger Ship has partnered with marketplace platform Mirakl starting this fall. The partnership will add 50,000 items from third-party sellers to the Kroger lineup. New items will include organic merchandise, international food, housewares and toys. Kroger stock has gained nearly 21% for the year to date while the S&P 500 index is up 4% for the period.Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.