Copyright Bloomberg

BYD Co.’s Hong Kong-listed shares are heading for their longest streak of monthly declines since 2018 as investors grow increasingly skeptical about the company’s ability to fend off competition in China. Ahead of earnings expected later Thursday, the stock has fallen 32% from a peak in May, wiping off more than $45 billion in market value. Traders have been questioning BYD’s momentum in its home country as vehicle sales from peers like Geely Automobile Holdings Ltd. and Zhejiang Leapmotor Technology Co. have surged.