Superior information has kept the company's gross return on auction sales close to 9% for the past seven years.

FORBES: Heavy metal

In some editions, a Weekend Investor article Saturday about Mitt Romney's tax return incorrectly said the percentage of the sales price attributable to the home office wouldn't be eligible for the income-tax exclusion.

WSJ: Corrections & Amplifications

One of Apple Sales International's parent companies, Apple Operations International, hasn't filed a corporate tax return in the past five years anywhere, the Senate panel found.

WSJ: Apple Pays No Tax on Much of Its Overseas Income, Senate Panel Finds