Samsung Electronics shares fell over 5% to 264,000 won after labor talks with the National Samsung Electronics Union collapsed.
The union, representing more than 50,000 workers, announced an 18‑day strike starting May 21 unless wage and bonus offers improve.
Workers demand removal of the bonus cap and larger profit share from Samsung’s AI chip business, citing SK Hynix’s higher payouts.
Samsung expressed regret over the failed talks but said it will continue dialogue with labour representatives.