Check out the companies making headlines in after-hours trading. Applied Materials — The semiconductor equipment manufacturer tumbled 11% after the current-quarter outlook missed expectations of analysts polled by LSEG. Fiscal third-quarter earnings and revenue topped estimates. UnitedHealth — The insurer jumped nearly 8% after Warren Buffett's Berkshire Hathaway revealed a new stake , according to a regulatory filing. Berkshire bought more than five million shares, amounting to a stake of more than $1.6 billion at the end of June. Sandisk — The data storage provider slumped almost 10% after posting a smaller non-GAAP gross margin than a year ago. The non-GAAP gross margin for the fourth quarter came in at 26.4% versus 36.4% a year ago. Gambling.com — The digital marketing servicer for onl

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