TEWKSBURY, Mass. – Arthur T. Demoulas has completed his purchase of the Demoulas chain, ending one of the most unusual sagas in recent corporate history.

The Market Basket CEO and his family announced Friday that they completed the purchase of the 50.5 percent of the company that was controlled by his cousin, Arthur S. Demoulas. Arthur T., as he is widely know, offered $1.6 billion in the buyout proposal in August.

Other details of the deal weren’t disclosed.

The nearly century-old supermarket chain based in Tewksbury, Massachusetts, has 73 stores in Massachusetts, New Hampshire and Maine.

Demoulas was fired in June by a board controlled by Arthur S. The ouster led to six weeks of worker walkouts and customer boycotts that left the usually packed stores empty, saw employees protested on streets, and nearly crippled the company.

The situation in which hourly workers and customers rallied to help their CEO was so unusual that it has become a staple of business school classes.

Arthur T. Demoulas has vowed to keep Market Basket’s reputation for low prices while maintaining the relatively high pay and perks for its employees. This week he announced that the annual Christmas bonus would be paid this year despite the added debt of the buyout.

– The Associated Press