Samsung Electronics’ largest union confirmed an 18-day strike. The labor action will begin on May 21, 2026. The union announced the decision on May 15, 2026, after wage and bonus negotiations collapsed.

Samsung began a warm-down process to preemptively reduce semiconductor production. The company initiated this move despite offering unconditional talks to the union.

Company shares fell by as much as 10% following the announcement. Analysts project potential financial losses in the billions of dollars. The strike threatens to disrupt the global chip supply chain.