Why Did Warren Buffett Sell Half of His Stake in Chevron?

I am quoted in a Business Insider article:

Warren Buffett built a $4 billion Chevron stake in 6
months — then halved it last quarter. Here’s how 3
experts explain the surprise sale.

Berkshire may also have cut its Chevron position because it wanted to take some profits
off the table, David Kass, a finance professor at the University of Maryland, told Insider.
“Buffett may have decided to realize a 35% profit in a short period of time,” Kass said,
pointing out that Berkshire spent an average of $83 per Chevron share, and the
company’s stock price surged as high as $112 last quarter.
The Berkshire chief may also have determined that oil prices were more likely to fall
than rise in the coming months, weakening the near-term outlook for Chevron stock,
Kass added.

Berkshire slashed other bank holdings, and eliminated its JPMorgan and Goldman
Sachs stakes entirely last year. Those disposals might indicate that Buffett is bracing for
a wave of defaults, Kass said. The investor may have plowed over $2 billion into Bank of
America stock over 12 days last fall because he considered the lender to be less risky
than its peers, he added.
“Buffett’s exit from GS, JPM, and WFC is perhaps a reflection of his fear of very bad
outcomes from the pandemic with numerous defaults on bank loans, especially
commercial real estate loans,” Kass said. “Bank of America has less exposure to commercial real estate loans than JPM and WFC.”