Check out the companies making headlines before the market opens. Domino's Pizza – The company's second-quarter results were mixed, causing its shares to plunge more than 13%. Domino's reported earnings of $4.03 per share, beating LSEG's estimate of $3.68 per share. However, revenue was in line with expectations at $1.1 billion. U.S. comparable store sales also grew slightly less than expected. United Airlines — Shares of United Airlines rose 1.5% in premarket after the airline said profit rose 23% last quarter. However, United also shared a disappointing outlook for the current quarter and said it expects adjusted earnings per share to be in a range of $2.75 to $3.25. Analysts surveyed by London Stock Exchange Group (LSEG) expected earnings of $3.44 per share. Discover Financial Services — The stock rose 3.5% after reporting better-than-expected second-quarter results. The banking and payments company reported earnings of $6.06 per share on revenue of $4.54 billion. Analysts polled by London Stock Exchange Group (LSEG) expected earnings of $3.07 per share on revenue of $4.17 billion. Warner Bros. Discovery — Shares of Warner Bros. Discovery rose nearly 6% after the Financial Times reported that the company was considering boosting its troubled stock. The company is considering a range of options, including spinning off its digital streaming and studio businesses, people familiar with the matter said. Alaska Air Group — Shares of Alaska Air Group fell more than 1% after the airline reported lower-than-expected second-quarter revenue. The company also narrowed its full-year profit guidance to $3.50 to $4.50 per share, while analysts polled by FactSet had forecast earnings of $4.52 per share. Blackstone — Shares of Blackstone fell 2% after the investment company's second-quarter revenue and profit fell short of expectations. Blackstone reported distributable earnings of 96 cents per share on segment revenue of $2.52 billion. Analysts polled by FactSet expected earnings of 98 cents per share on revenue of $2.58 billion. Beyond Meat – Shares of the alternative meat producer fell 12%. Beyond Meat has reached out to a group of bondholders to begin discussions around restructuring its balance sheet, the Wall Street Journal reported, citing people familiar with the matter. Taiwan Semiconductor — Shares of U.S.-listed Taiwan Semiconductor rose 1.2% after the chipmaker reported better-than-expected second-quarter results. The company's revenue was NT$673.51 billion and revenue was NT$247.85 billion. Analysts surveyed by LSEG expected net profit of NT$238.8 billion and revenue of NT$657.58 billion. Alcoa — The aluminum company rose 1.1%. Alcoa's adjusted earnings per share were 16 cents, beating analysts' expectations of 9 cents per share, according to LSEG. Revenue was also higher than expected, at $2.91 billion, compared with analysts' expectations of $2.84 billion. Toast — Shares of the restaurant technology stock rose more than 3% after Mizuho upgraded the stock to outperform from neutral. The investment firm said that as Toast continues to grow in scale, it may be able to negotiate lower fees with credit card companies. Kinder Morgan — Kinder Morgan shares fell 2% after the company reported quarterly results that missed expectations. The pipeline operator reported second-quarter adjusted earnings of 25 cents a share, below the 26 cents a share expected by analysts polled by FactSet. Revenue also fell short of expectations. Elf Beauty – The beauty stock rose 3.5% after Baird upgraded its performance to outperform from neutral. The company sees healthy brand momentum, continued distribution expansion and international opportunities as catalysts. The company also raised its price target to $230 from $210, which would represent a nearly 35% upside from Wednesday's closing price. Gap — Shares of Gap rose 2.4% after Morgan Stanley upgraded the retailer to overweight from equal. The investment bank also named Gap one of its favorite retail picks, citing its healthy revenue growth and profitability. —CNBC’s Michelle Fox, Jesse Pond and Samantha Subin contributed reporting