Berkshire Hathaway's (NYSE: BRK.A) (NYSE: BRK.B) stock price hit an all-time high on Aug. 30 -- Warren Buffett's 94th birthday -- before proceeding to rise even higher on Sept. 3 despite a 2.1% sell-off in the S 500. The shares of the giant conglomerate are now up more than 27% year to date, outperforming both the S 500 and Nasdaq Composite by a wide margin.

Its portfolio managers have been on something of a selling spree lately -- making a large reduction in its Apple stake earlier this year and trimming its Bank of America position by 14.5% since mid-July.

However, Berkshire has maintained a sizable holding in oil and natural gas exploration and production company Occidental Petroleum (NYSE: OXY), owns American Express, Visa, and Mastercard (NYSE: MA), and initiated a position in Ulta Beauty (NASDAQ: ULTA) earlier this summer.

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Source Fool.com