Stocks making the biggest moves midday: Berkshire Hathaway, Catalent, Tyson Foods, Zscaler and more

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Check out the companies making headlines in midday trading.

Berkshire Hathaway — The conglomerate's A shares rose more than 1% as investors cheered a strong earnings report from Warren Buffett's company. On Saturday, Berkshire reported a 12.6% jump in operating earnings in the first quarter, driven by a rebound in the conglomerate's insurance business. The stock briefly topped $500,000 apiece Monday.

Catalent — Catalent shares plunged 27% after the company said it will delay the release of its fiscal third-quarter results and expects significant cuts to its 2023 guidance.

Tyson Foods — Shares plummeted 15% after the food production company posted an unexpected loss for the recent quarter and cut its revenue outlook for the year. Tyson Foods now said it anticipates between $53 billion and $54 billion in revenue for the year.

Zscaler — The cloud security stock rallied 22% on strong preliminary earnings and full-year guidance. Preliminary revenue, non-GAAP operating income and billings for the company's third quarter all came in above respective consensus estimates of analysts polled by FactSet. The company also raised its full-year guidance.

Occidental Petroleum — The energy stock fell nearly 2% after Warren Buffett knocked down speculation that Berkshire Hathaway would take full control of the oil giant. He said he doesn't know what Berkshire would do with it. The «Oracle of Omaha» has amassed a stake of 23.5%, while receiving approval to purchase up to 50% of the company.

PacWest — The regional bank stock held on to a gain of about 3% on Monday. Shares opened nearly 30% higher after PacWest slashed its dividend but said its business was still «fundamentally sound.» Other regional bank stocks also gave up