Title: Warren Buffett
Content:  for himself, and three for his sister Doris Buffett (who also became a philanthropist). At 15, Warren made more than $175 monthly delivering Washington Post newspapers. In high school, he invested in a business owned by his father and bought a 40-acre farm worked by a tenant farmer. He bought the land when he was 14 years old with $1,200 of his savings. By the time he finished college, Buffett had accumulated $9,800 in savings (about $0 today). In 1947, Buffett entered the Wharton School of the University of Pennsylvania. He would have preferred to focus on his business ventures, but his father pressured him to enroll. Warren studied there for two years and joined the 
Title: Warren Buffett
Content:  Buffett invested in PetroChina Company Limited and in a rare move, posted a commentary on Berkshire Hathaway's website stating why he would not divest over its connection with the Sudanese civil war that caused Harvard to divest. He sold this stake soon afterwards, sparing him the billions of dollars he would have lost had he held on to the company in the midst of the steep drop in oil prices beginning in the summer of 2008. In October 2008, Buffett invested $230 million for 10% of battery maker BYD Company, which runs a subsidiary of electric automobile manufacturer BYD Auto. In less than one year, the investment reaped over 500% return. In May 2018, BYD's shares had a substantial fall with a total net investment loss of $9 billion. This was Buffett's worst investment in China.
Title: Warren Buffett
Content:  Warren Edward Buffett (born August 30, 1930) is an American business magnate, investor, and philanthropist. He is currently the chairman and CEO of Berkshire Hathaway. He is considered one of the most successful investors in the world and has a net worth of over $102.1 billion as of December 2021, making him the world's tenth-wealthiest person. Buffett was born in Omaha, Nebraska. He developed an interest in business and investing in his youth, eventually entering the Wharton School of the University of Pennsylvania in 1947 before transferring to and graduating from the University of Nebraska at 19. He went on to graduate from Columbia Business School, where he molded his investment philosophy 
Title: History of private equity and venture capital
Content:  At the time of Buffett's investment, Berkshire Hathaway was a textile company, however, Buffett used Berkshire Hathaway as an investment vehicle to make acquisitions and minority investments in dozens of the insurance and reinsurance industries (GEICO) and varied companies including: American Express, The Buffalo News, the Coca-Cola Company, Fruit of the Loom, Nebraska Furniture Mart and See's Candies. Buffett's value investing approach and focus on earnings and cash flows are characteristic of later private equity investors. Buffett would distinguish himself relative to more traditional leveraged buyout practitioners through his reluctance to use leverage and hostile techniques in his investments.
Title: Early history of private equity
Content:  At the time of Buffett's investment, Berkshire Hathaway was a textile company, however, Buffett used Berkshire Hathaway as an investment vehicle to make acquisitions and minority investments in dozens of the insurance and reinsurance industries (GEICO) and varied companies including: American Express, The Buffalo News, the Coca-Cola Company, Fruit of the Loom, Nebraska Furniture Mart and See's Candies. Buffett's value investing approach and focus on earnings and cash flows are characteristic of later private equity investors. Buffett would distinguish himself relative to more traditional leveraged buyout practitioners through his reluctance to use leverage and hostile techniques in his investments.
Title: Warren Buffett
Content:  Sachs try to find me." In November 2011, it was announced that over the course of the previous eight months, Buffett had bought 64 million shares of International Business Machine Corp (IBM) stock, worth around $11 billion. This unanticipated investment raised his stake in the company to around 5.5 percent—the largest stake in IBM alongside that of State Street Global Advisors. Buffett had said on numerous prior occasions that he would not invest in technology because he did not fully understand it, so the move came as a surprise to many investors and observers. During the interview, in which he revealed the investment to 
Title: Warren Buffett
Content:  the concept of value investing pioneered by Benjamin Graham. He attended New York Institute of Finance to focus his economics background and soon after began various business partnerships, including one with Graham. He created Buffett Partnership, Ltd in 1956 and his firm eventually acquired a textile manufacturing firm called Berkshire Hathaway, assuming its name to create a diversified holding company. In 1978, Charlie Munger joined Buffett as vice-chairman. Buffett has been the chairman and largest shareholder of Berkshire Hathaway since 1970. He has been referred to as the "Oracle" or "Sage" of Omaha by global media. He is noted for his adherence to value investing, and his personal frugality despite his immense 
Title: May 1965
Content: Warren Buffett, an investor from Omaha, Nebraska and a recent millionaire, completed three years of purchasing stock in the Berkshire Hathaway Company, a financially ailing textile manufacturer, achieved a controlling interest, and fired the former president, Seabury Stanton. Buffet's initial motivation was revenge against Stanton for an insult that arose when Stanton verbally offered to buy Berkshire's existing stock at the rate of $11.50 per share, but then sent a written agreement changing the terms to $11.375 per share.  Over the next decades, Buffet would transform Berkshire Hathaway into a $500 billion conglomerate that now owns GEICO Insurance, Dairy Queen restaurants, Helzberg Diamonds, the Fruit of the Loom company and large shares of other corporations. ; Born: ; Linda Evangelista, Canadian model, in St. Catharines, Ontario ; Kiyoyuki Yanada, Japanese voice actor, in Tokyo ; Died: ; Hubertus van Mook, 70, Governor-General of the Dutch East Indies from 1942 to 1948, prior to its independence as Indonesia ; I. T. A. Wallace-Johnson, 71, Sierra Leonean workers' leader, journalist, activist, and founder of the United National People's Party, was killed in an auto accident while in Ghana 
Title: Jeffrey Tarrant
Content:  In early 2008, Warren Buffett bet Protégé Partners that over a 10-year period, the S&P 500 Index would outperform a portfolio of hedge funds. For the bet, done through the Long Now Foundation, Protégé built an index of five funds that invest in hedge funds, placing its bet on the average returns of those funds after all fees. Buffett bet on a low-cost S&P 500 index fund sold by Vanguard. Each side put up $320,000, with the money used to buy a US Treasury bond that would be worth $1 million at the conclusion of the bet, on December 31, 2017. The $1 million will be donated to the winner’s choice of charity. In 2012, after the bonds appreciated faster than expected and interest rates fell, the two sides agreed to buy 11,200 Berkshire Hathaway B shares, which at the end of 2017 were worth $2.22 million. Buffett won the bet, and that amount was donated to Girls Inc. of Omaha.
Title: Warren Buffett
Content:  1957, Buffett operated three partnerships. He purchased a five-bedroom stucco house in Omaha, where he still lives, for $31,500. In 1958 the Buffetts' third child, Peter Andrew, was born. Buffett operated five partnerships that year. In 1959, the company grew to six partnerships and Buffett met future partner Charlie Munger. By 1960, Buffett operated seven partnerships. He asked one of his partners, a doctor, to find ten other doctors willing to invest $10,000 each in his partnership. Eventually, eleven agreed, and Buffett pooled their money with a mere $100 original investment of his own. In 1961, Buffett revealed that 35% of the partnership's assets were invested in the Sanborn Map Company. 

Question: what did warren buffett invest in?
Answer: Berkshire Hathaway.