The sale by Berkshire Hathaway has changed the float of Apple stock, with more shares available to investors. Rules from indexes, in some cases, use float-adjusted market capitalizations, which take into account large stakes held by fund managers.

Shares of Apple Inc. advanced 1.80% to $220.69 Wednesday, on what proved to be an all-around dismal trading session for the stock market, with the NASDAQ Composite Index falling 0.31% to 17,573.30 and Dow Jones Industrial Average falling 0.

While the rest of the market has been ticking higher over the past few weeks, shares of Apple Inc. (NASDAQ: AAPL) are still under pressure. They managed to rally hard throughout August, undoing most of the damage from the market-wide selloff that took them down 17% at the start of the month,