Stocks making the biggest moves premarket:

$Heico(HEI.US)$
— The engine and aircraft part manufacturer lost more than 5% even after topping fiscal third-quarter revenue expectations. Heico reported revenue of $723 million for the previous quarter, ahead of the $702 million expected by analysts polled by Refinitiv. Heico did report a decline in operating margins to 20.7% from 22.6% a year ago.
$NIO Inc(NIO.US)$
— Nio's stock lost more than 6% before the bell after the Chinese electric vehicle company reported a wider-than-expected loss quarterly loss. Deliveries also declined from the year-ago period.
$JM Smucker(SJM.US)$
— Shares of the snack food company rose more than 2% after J.M. Smucker's fiscal first-quarter earnings topped expectations. The company reported $2.21 in adjusted earnings per share, while analysts were looking for $2.02 per share, according to FactSet's StreetAccount. J.M. Smucker's revenue of $1.81 billion did come in under estimates of $1.84 billion, but the company raised its earnings guidance.
$Boyd Gaming(BYD.US)$
— The Chinese automaker’s U.S.-traded shares rose more than 2% Tuesday premarket, a day after it announced a 204.68% jump in net profit for the first half of 2023.
$Toyota Motor(TM.US)$
— U.S.-listed shares of Toyota Motor lost about 1% after the automaker halted production at its assembly plants in Japan due to a system malfunction.