NEW YORK (CNNMoney.com) -- Warren Buffett's legendary Berkshire Hathaway joined the S&P 500 index after markets closed Friday.
Class B (BRKB) shares of Berkshire Hathaway fell during the first half of Friday's session, tracking the broader market, but began to climb in the afternoon and spiked during the last hour of trading. It ended 1.25% higher on the day, at $77.65 per share on volume of 66.4 million shares, 91% higher than the average 5.5 million.
Friday afternoon's surge in the stock's price and trading volume was a result of S&P 500 index fund managers buying the stock before close, said Fred Dickson, chief market strategist at D.A. Davidson & Co.
Companies added to the S&P 500 usually experience a boost in stock price because money managers that run index funds tied to the benchmark need to own it.
Shareholders of Berkshire Hathaway approved a 50-for-1 split of Class B common stock last month, so the company could offer shares to investors in Burlington Northern Santa Fe (BNI, Fortune 500), which it agreed to buy in November for $34 billion. Berkshire completed its purchase of the railroad company Friday.
The split cut the price of Class B shares from more than $3,300 a pop, to a more affordable $66, and paved the way for Berkshire to finally join a major stock index.
Berkshire will officially begin trading on the S&P 500 Tuesday, since the market is closed Monday in observance of President's Day.
One criteria for joining the S&P 500 Index is that the stock must be widely available. The index is a common proxy for the U.S. stock market, and major index funds that track the blue chip index hold shares of its companies.
Investors need someone they can bring home to mother instead of bad boys (or girls) that may make their heart beat faster. Boring beats bold in this market. Here are 10 dependable stocks we love. Southwest (ticker symbol: LUV) is one. More
Cheap oil and slow global growth may not be the only culprits of the global market turmoil. There's growing concern that central banks are spooking the markets too. More
Women coders do better than men in a gender-blind study that examines GitHub requests. More
Why is Donald Trump missing from Bleacher Creatures' new line of presidential candidates plush dolls? More