Stocks making the biggest moves premarket: American Express, AutoNation, CSX and more

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Check out the companies making headlines before the bell:

American Express — American Express slid 3% after posting smaller-than-expected revenue for the previous quarter, even as earnings per share beat expectations. The company reported second-quarter earnings of $2.89 per share on revenue of $15.05 billion. Analysts polled by Refinitiv had expected per-share earnings of $2.81 on revenue of $15.48 billion.

AutoNation — Shares slid 3% even after AutoNation reported second-quarter results that beat expectations. The company beat on the top and bottom lines, reporting adjusted earnings of $6.29 per share on revenue of $6.89 billion. Analysts expected per-share earnings of $5.91 on revenues of $6.78 billion.

Sunnova Energy — The solar company shed 2% after being downgraded by BMO to market perform from outperform. BMO cited the challenging macro backdrop for residential solar and said Sunnova's debt issuances could weigh on the stock.

CSX — CSX fell 4% after the transportation company missed revenue expectations in its second quarter. CSX reported revenue of $3.7 billion, lower than the $3.74 billion consensus estimate from Refinitiv. Earnings per share came in line with consensus at 49 cents.

Capital One Financial — The financial stock rose slightly after the company posted better-than-expected earnings for the latest quarter. Capital One reported adjusted earnings of $3.52 per share, beating a Refinitiv estimate of $3.23 per share. However, its revenue missed expectations. Total deposits also decreased 2% at the end of the second quarter.

PPG Industries — PPG Industries declined 2% even after reporting strong second-quarter results. The supplier of paints, coatings and other materials posted adjusted