NEW YORK — Sears will close dozens more stores as sales shrink and losses grow, an announcement that has become a familiar refrain as the company retrenches.

The beleaguered retailer, which operates Kmart and Sears stores, said it has identified about 100 stores that are no longer turning a profit, and the majority of those locations will be shuttered soon.

Sears released a list of 63 stores that it said will close in September. It said earlier in the day there would be 72 closed, but said some were being re-evaluated.

After this round of closures, the company will have about 800 stores, down from about 1,000 at the end of last year and far below the 2012 peak of 4,000 stores.

Sears also posted a quarterly loss of $424 million and said store closings already underway contributed to a drop of more than 30 percent in revenue. That marks more than five years of straight quarterly sales drop, according to FactSet.

Sales at established stores, a key gauge of a retailer’s health, tumbled nearly 12 percent, down 9.5 percent at Kmart stores and 13.4 percent at Sears.

Rob Riecker, Sears’ chief financial officer, said in a prerecorded call that the company’s stores are “a critical component in our transformation.”

But to meet customer needs and improve financial results, Sears must close poorly performing stores and “focus on our best stores, including our newer smaller-store formats,” he said, according to a transcript of the call.

The latest closings underscore the problems at Sears, which was once a powerhouse retailer that survived two world wars and the Great Depression but has been calving off pieces of itself as it burns through money.

“The demise of Sears has felt like a prolonged, drip, drip, drip as evidenced by the string of quarterly sales numbers,” said Mark Hamrick, Bankrate.com senior economic analyst. “Essentially, it has been injury by a thousand cuts, whether by failing to staff stores to provide customers with good experiences or by failing to stock better quality merchandise in its stores.”

Chairman and CEO Edward Lampert, who combined Sears and Kmart in 2005 after helping to bring the latter out of bankruptcy, has long pledged to save the famed retailer, which started in the 1880s as a mail-order catalog firm.

But the stores have remained an albatross. And Kenmore, the retailer’s renowned appliance brand, became the latest potential sale after ESL Investments, the company’s largest shareholder, headed by Lampert, said it might be interested in buying it.

Sears also announced recently that shoppers could buy tires on Amazon.com, have them shipped to a Sears Auto Center and then bring in their car to get them installed.

Amazon began selling Sears’ Kenmore brand of ovens, washers and other appliances last year.

For the period that ended May 5, Sears lost $3.93 per share. It earned $245 million, or $2.29 per share, a year earlier, a quarter that included a $492 million gain tied to the sale of the Craftsman brand.

The financial results stand out amid higher consumer confidence and a solid economy. Walmart, Best Buy and other department stores such as Macy’s have posted rosier results.

Shares of Sears Holdings Corp. ended 12 percent lower Thursday at $2.81.