Warren Buffett, the billionaire investor and CEO of Berkshire Hathaway, has traditionally been known for his preference for investing in well-established, profitable companies with a long track record of success. He has been famously skeptical of investing in start-ups, preferring instead to invest in established businesses with a proven track record. 

Buffett has stated that he prefers to invest in companies with a "moat" – a competitive advantage that makes it difficult for competitors to replicate their success. He believes that such companies are more likely to be successful over the long term and are less risky than start-ups.

Despite this, Buffett has made some notable investments in start-up companies over the years, including his investment in the ride-hailing company, Uber. However, these investments are relatively rare for him and tend to be the exception rather than the rule.

As for bonds and other investment instruments, Buffett is known for his preference for investing in equities, particularly value stocks. However, he has also been known to invest in bonds, particularly U.S. government bonds, as a way to preserve capital and generate income. Overall, Buffett is known for his long-term investment strategy and his willingness to patiently wait for opportunities to arise rather than chasing short-term gains.
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