See the companies making headlines in midday trading. Signet Jewelers — Shares fell 11% after the jeweler issued first-quarter revenue guidance that missed Wall Street estimates. The company said it expects revenue in the range of $1.47 billion to $1.53 billion, while analysts polled by FactSet forecast $1.61 billion. Chipotle — Shares rose 6.4% to an all-time high after the Mexican restaurant chain The fast food company announced that its board of directors has approved a 50-for-1 stock split. The plan, which was presented to the public Tuesday, is expected to take effect in June if approved by shareholders. Deutsche Bank also raised its target price for the stock, citing strong growth prospects. Mobileye Global – Shares rose 6% after Volkswagen announced an expanded partnership with the auto technology company. Mobileye will provide the European automaker with new automated driving technologies. FMC – Shares of the chemical maker gained nearly 5% after receiving a buy recommendation from UBS. The bank believes shares could rise as FMC returns to or beats guidance, its profitability improves and the market sees an end to inventory drawdowns. Riot Platforms — Shares of the bitcoin miner rose 4% after JPMorgan upgraded its rating from neutral to overweight, citing its “unique combination of industry-leading energy contracts, scale and liquidity.” Best buy. The electronics retailer gained nearly 3% after Telsey raised shares to outperform the market, citing signs of stabilization and improvement thanks to a replacement cycle and new product innovations such as Ray-Ban glasses. Boeing – Shares rose more than 2% amid a flurry of reports about the struggling carrier. Bloomberg, citing unnamed sources, reported that Boeing is exploring the possible sale of at least two of its defense businesses. Reuters, citing people familiar, said Boeing was studying how Spirit AeroSystems could reduce Airbus’ exposure. Carmax – Used car inventory up 2% after switching to Needham. The investment firm said Carmax should benefit as the used car market gets more supply and lower interest rates. General Mills — Shares rose 1.7% after the food company reported third-quarter results that beat revenue and profit expectations. General Mills reported adjusted earnings of $1.17 per share on revenue of $5.10 billion. Analysts polled by LSEG expected earnings per share of $1.05 on revenue of $4.97 billion. Equinix – Shares fell more than up 4% after Hindenburg Research released a report targeting the data center company. — CNBC’s Sarah Min, Alex Harring, Jesse Pound, Lisa Khan and Michelle Fox contributed reporting.