Warren Buffett's luck changed this year, allowing him to spend a record sum on stocks and end his deal drought. Here are his 6 highlights of 2022.

Buffett published his famous annual letter to Berkshire shareholders in February.

The investor vented his frustration with Berkshire's mammoth $144 billion cash pile, blaming a lack of bargains in the stock market. He also celebrated the "Four Giants" among Berkshire's businesses: insurance, railroads, energy, and its enormous Apple stake.

Moreover, Buffett appeared to respond to criticism of his tax practices by noting Berkshire paid $3.3 billion of federal income tax in 2021 — nearly 1% of all the corporate income taxes collected by the US government that year.

Here's a roundup of the best quotes from Buffett's letter, and here are the key insights it contained.

Buffett struck a deal to buy Alleghany for nearly $12 billion in March. Berkshire completed its takeover of the insurer in October, ending a years-long drought on the acquisition front.

The investor showcased his trademark approach to dealmaking, which prizes trust and simplicity. He proposed the merger over dinner with Alleghany's CEO, who previously ran a Berkshire subsidiary, and the pair formally announced a deal less than two weeks later.

Buffet also refused to budge on the deal terms, and when Alleghany enlisted Goldman Sachs as a financial advisor, he insisted the investment bank's fee was subtracted from Berkshire's offer price.

Berkshire plowed a net $41 billion into stocks in the first quarter of 2022, setting a new record for its quarterly spending on equities.

Buffett and his team built large stakes in HP, Chevron, Occidental Petroleum, Citigroup, Paramount, and Taiwan Semiconductor in the first nine months of 2022. Berkshire also spent over $5 billion on buybacks and made other sizeable purchases, lifting its spending on stocks and acquisitions for the year to an astounding $70 billion or so.

Buffett hosted Berkshire's annual shareholder meeting in his hometown of Omaha, Nebraska in April, after two years of virtual gatherings due to the pandemic.

The investor called out the reckless speculation in the stock market, underlined the grave threat posed by inflation, and declared he wouldn't pay $25 for all the bitcoin in the world.

Here's a roundup of the best quotes from the meeting, and here are the key takeaways. Insider also visited Berkshire's "Bazaar of Bargains," and interviewed several CEOs of subsidiaries, including See's Candies' Pat Egan, Dairy Queen's Troy Bader, Brooks Runnings' Jim Weber, Borsheims' Karen Goracke, and Cort's Jeff Pederson.

Buffett made some big moves in 2022 that deserve special attention. For example, he poured a total of about $30 billion into Chevron and Occidental, propelling the pair of oil-and-gas companies onto the list of Berkshire's most-valuable holdings.

The investor and his team also revealed in November they had boosted their billion-dollar bets on Japan's five largest trading houses.

In contrast, they sold BYD shares for the first time in 14 years. Berkshire has now slashed its position in the Chinese electric-vehicle maker by around 22%, and pocketed an estimated $1.2 billion profit from the disposals.

Buffett made his usual annual donation of Berkshire stock in June, dividing the $4 billion gift between the Bill & Melinda Gates Foundation and four of his family's charities.

Unexpectedly, he contributed a further $759 million worth of Berkshire stock to his three children's foundations for Thanksgiving, saying he was proud of their charitable work and wanted to show his appreciation.