Chinese AI chipmaker Cambricon Technologies saw a 12% decline in morning trade on Thursday, following a meteoric August rally. Its stock had more than doubled, pushing its weight on the STAR50 Index to 15%, triggering concerns of rebalancing on September 12. Semiconductor shares traded onshore fell nearly 6%, dragging the STAR50 Index down over 5%.

Cambricon issued a risk warning last week due to a sharp rise in its share price, aiming to curb speculative buying. Tech and artificial intelligence stocks have been driving China’s stock bull run, with the STAR50 Index and AI shares up 26% and 47% respectively this year. Meanwhile, China is reportedly considering measures to cool its stock market amid concerns over the recent rally.

Read more at Yahoo Finance: Shares of Chinese AI chipmaker Cambricon tumble on profit-booking