(Bloomberg) — Shares of Berkshire Hathaway Inc. were left out of the stock market rally in the second quarter. Warren Buffett clearly thought the disconnect wasn’t warranted.

The famed investor spent a record $5.1 billion buying back Berkshire’s own stock in the second quarter, more than double the amount he’d ever purchased before. That came as he unloaded almost $13 billion of other companies’ shares, including airline stocks and some financials, in what was his biggest selling quarter in more than a decade.

Buffett has been building up cash this year and took a more cautious tone at his annual meeting in May as the Covid-19 pandemic has slammed the economy without putting a permanent dent in stock-market valuations. But his appetite for his own stock in the second quarter, along with recent signs that he’s been willing to put more money to work, are reasons for some optimism, according to Jim Shanahan, an analyst at Edward Jones.

“The buybacks are a relatively safe way to deploy capital in an uncertain environment,” said Shanahan, who estimated that Berkshire repurchased another $2.4 billion of shares in July. “But it’s clear that that’s not all he’s doing.”

Buffett’s cash pile surged to a record $146.6 billion at the end of June, in part from dumping all of his airline shares in April. He’s been more active lately, striking a deal for natural-gas assets in July and snapping up at least $2 billion of Bank of America Corp. stock in recent weeks through Aug. 4. Overall, Saturday’s disclosures signaled to longtime shareholder Bill Smead that Berkshire is a bit more certain about its standing in this volatile environment.

“He sees that the company itself can get through the worst body blow,” said Smead, the chief investment officer at Smead Capital Management, which oversees $1.5 billion including Berkshire shares. And his buybacks signal that “it got obvious to him how out of favor his own stock is in relation to other investments you could make in other companies.”

Berkshire’s Class A shares, which fell in line with the S&P 500 in the first three months of the year as the pandemic spread in the U.S., fell another 1.7% last quarter while the broader index rallied 20%. Buffett said in early May that repurchases weren’t more compelling than at previous times, but the buybacks in the quarter suggest his thinking shifted.

The company’s stock has rallied in July and August, with Shanahan attributing that to investors being encouraged by Berkshire’s recent deals, but it’s still underperforming in 2020. Berkshire Class A shares were down 7.4% for the year through Friday’s close, compared with the 3.7% gain in the S&P 500.

Berkshire’s operating profit slumped 10% in the second quarter to $5.5 billion. That was driven by a 42% drop in earnings from the conglomerate’s manufacturing, service and retailing businesses.

The company also took $10 billion of impairment charges related to its Precision Castparts unit. Berkshire bought Precision Castparts in 2016 in a transaction valued at $37.2 billion, making it one of Buffett’s biggest deals. Now the maker of jet-engine blades and aircraft structural components is bracing for lean times as Boeing Co. and Airbus SE cut jetliner production and less air travel reduces the need for replacement parts.

The impairment charge “reflects a very ample purchase price combined with some secular challenges,” Cathy Seifert, an analyst at CFRA Research, said in an interview. “The sense that I get from the magnitude of the writedown and the tone of some of the comments related to air travel, and the industry supporting air travel, is that there’s some demand destruction there that could be permanent or semi-permanent.”

The challenges have forced the aerospace-parts maker to undergo “aggressive restructuring,” with the company cutting its workforce by about 10,000 employees during the first half of 2020.

“We believe the effects of the pandemic on commercial airlines and aircraft manufacturers continues to be particularly severe,” Berkshire said in a regulatory filing Saturday. “In our judgment, the timing and extent of the recovery in the commercial airline and aerospace industries may be dependent on the development and wide-scale distribution of medicines or vaccines that effectively treat the virus.”