Warren Buffett has become one of Apple's (NASDAQ: AAPL) biggest bulls in recent years. In fact, Apple is Berkshire Hathaway's (NYSE: BRK-A) (NYSE: BRK-B) largest position by far, worth more than twice as much as the holding company's second-largest position, Bank of America. While the Oracle of Omaha is confident in Apple's fundamentals, he did express some reservations over the stock's valuation earlier this year. "We aren't buying it here," Buffett said in February when shares were trading below $175. Seeing as how the stock has rallied over 50% since then, it should come as little surprise that Berkshire Hathaway just modestly trimmed its Apple position. CEO Tim Cook introduces the iPhone 11 Pro. Image source: Apple. A 0.3% reduction Berkshire Hathaway filed its quarterly 13F last week detailing its holdings at the end of the third quarter. The regulatory filing shows that Berkshire Hathaway sold 750,650 shares in Q3. That might sound like a lot (those shares are worth nearly $200 million based on current levels), but the reduction represents a mere 0.3% of the shares that Berkshire Hathaway held at the end of the second quarter. Data source: SEC filings. Chart by author. Buffett still holds over 248.8 million shares in the tech company, currently worth approximately $65.7 billion. Berkshire Hathaway had left its Apple position alone for two quarters after selling 2.9 million shares in the fourth quarter of 2018, a decision that the famed investor attributed to one of his longtime trusted lieutenants, Ted Weschler or Todd Combs, in order to free up cash for another investment. With Apple shares continuing to march higher and numerous analysts raising price targets on Friday, it might be a while Buffett is willing to buy more shares considering his previous comments regarding valuation. Speaking of other investments Berkshire Hathaway established new positions in RH (NYSE: RH) and Occidental Petroleum (NYSE: OXY). Buffett (or his lieutenants) scooped up over 1.2 million shares of RH, the furniture maker previously known as Restoration Hardware, sending the stock soaring. RH has been struggling over the past couple of years but has been putting together a turnaround while trying to reposition itself as a lifestyle brand. Berkshire Hathaway had previously committed $10 billion to Occidental Petroleum as part of the latter company's acquisition of Anadarko Petroleum, which closed in August. As part of that deal, Occidental issued 100,000 shares of preferred stock to Berkshire Hathaway in addition to warrants to purchase 80 million shares at an exercise price of $62.50. Some analysts have criticized the Anadarko acquisition, arguing that Occidental overpaid and destroyed shareholder value in the process, but Buffett is clearly unfazed, as Berkshire Hathaway bought nearly 7.5 million common shares of Occidental during the third quarter. 10 stocks we like better than Berkshire Hathaway (A shares)When investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has quadrupled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Berkshire Hathaway (A shares) wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of June 1, 2019 Evan Niu, CFA owns shares of Apple. The Motley Fool owns shares of and recommends Apple and Berkshire Hathaway (B shares). The Motley Fool recommends RH and recommends the following options: long January 2020 $150 calls on Apple, short January 2020 $155 calls on Apple, long January 2021 $200 calls on Berkshire Hathaway (B shares), short January 2021 $200 puts on Berkshire Hathaway (B shares), and short January 2020 $220 calls on Berkshire Hathaway (B shares). The Motley Fool has a disclosure policy.Source