Why is Samsung Electronics stock plunging today?

Samsung Electronics shares plummeted nearly 6.0% to ₩205,000 on Thursday, as investors rapidly exited semiconductor stocks. This sharp decline followed disappointing U.S. earnings overnight and a Democrat victory in the midterm elections. While the latter outcome initially boosted markets, concerns emerged that new regulatory oversight could slow the construction of AI data centers, subsequently affecting demand for high-bandwidth memory and server chips.

The situation worsened for tech companies, with ARM and Qualcomm reporting weak earnings in the September quarter, sparking further unease about long-term artificial intelligence chip demand. These events piled on top of existing headwinds for Samsung Electronics, which has struggled to execute significant share buybacks due to South Korea's financial-industrial separation regulations.

The absence of this buyback program disappointed investors, especially after the company's Q3 results were released, leaving the stock without a crucial technical support mechanism.

Furthermore, Samsung Electronics faced internal challenges as a sixth labor union formally registered at the company, deepening divisions between the semiconductor and finished-products divisions over performance pay. The broader market context also contributed to the selling pressure, with South Korea's KOSPI falling 5%, prompting a trading halt, and Nasdaq 100 futures slipping 0.7% in Asian trade.