Stocks making the biggest moves midday: Micron, Pioneer Natural Resources, Block, AMC and more

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Check out the companies making headlines in midday trading Monday.

Block — Shares of the payments stock lost 3% following a downgrade to market perform from outperform by KBW. The firm cited pressures from "'small risks starting to add up," including potential regulatory scrutiny of its Cash App business.

Tesla — Shares of Elon Musk's electric vehicle company fell more than 1.5% after the firm announced another price cut in the U.S., its fifth since the start of the year. The move came as tougher U.S. standards are set to reduce the $7,500 tax credit available for Tesla's Model 3. The EV maker also said Sunday it will open a new Megafactory in Shanghai that is capable of producing 10,000 Megapacks — large batteries —a year.

Pioneer Natural Resources – Shares of the fracking giant popped nearly 6% after The Wall Street Journal reported that Exxon Mobil has held informal talks to acquire Pioneer. Exxon shares fell 0.6%.

Micron Technology — Micron Technology's shares gained 8% after its rival Samsung Electronics announced that it plans to cut memory chip production in the near term. Many Wall Street analysts said the move could accelerate a return to supply-demand balance and potential rebound in the chipmaking sector. Chip giant Western Digital also added about 8%.

Excelerate Energy, EQT and other gas stocks — Shares of Excelerate Energy, EQT and other gas stocks ticked higher as natural gas futures climbed. Excelerate added more than 1%, while EQT jumped 3.7% and Matador Resources gained 2.9%. Excelerate also got a boost from a new Deutsche Bank report, wherein the firm initiated coverage of the stock, rated it a buy and said it was trading below its industry peers.

Apple, Google, Microsoft — Shares of