Samsung’s union strike puts 3-4% of global DRAM supply at risk

A pay fight at the world's largest memory maker is days from becoming a supply problem for anyone who buys DRAM or NAND. Samsung Electronics (005930.KS) and its largest union returned to government-mediated talks on May 18, three days before a planned 18-day walkout set for May 21 through June 7. The same day, the Suwon District Court partially granted Samsung's injunction: strikers must keep safety and security facilities staffed and cannot let equipment or wafers degrade, with daily fines for violations. That caps the absolute worst case. It does not stop a walkout of up to roughly 50,000 workers from cutting output.

The union wants the bonus formula fixed in the contract at 15% of operating profit toward performance pay, with the cap currently set at 50% of base salary removed and discretionary one-time payouts ended. Samsung has countered with a one-time package and roughly 10 to 13% of chip-division operating profit but will not commit to a permanent formula. The benchmark is SK Hynix (000660.KS), which locked 10% of annual operating profit to workers for a decade and removed its cap, reportedly worth around $460K to $477K per head on 2026 forecasts. Samsung's workforce noticed.

Roughly 43,000 workers had signed up to strike by mid-May, with the union targeting 50,000, and the prime minister has hinted at emergency arbitration to head it off. JPMorgan models a worst-case hit to Samsung's annual operating profit near $28 billion. April's one-day action reportedly cut memory fab output 18% on the affected night shift and foundry output 58%, so the production sensitivity is established before an 18-day stoppage even begins.

TrendForce estimates a full strike removes 3-4% of global DRAM and 2-3% of NAND, against an industry inventory cushion of only four to six weeks, with DRAM already up sharply over the past year. Samsung has begun curbing wafer starts and shifting its mix toward HBM and advanced nodes, which protects its highest-margin lines and pushes commodity DRAM and client NAND further back in the queue. Spot prices move first and retail RAM and SSD pricing follows within weeks.

Drafted with AI assistance against parallel reporting.

Sources:

• DigiTimes, “Samsung and union enter new round of talks ahead of planned strike” (May 18, 2026, paywalled stub: headline and deck only)
• Korea Herald / Seoul Economic Daily, “Samsung wins partial injunction against unions ahead of strike” (May 18, 2026)
• CNBC, “Samsung strike involving 47,000 workers looms as South Korea's president urges labor deal” (May 18, 2026)
• Bloomberg, “Samsung Labor Talks Collapse as Risks to Chip Supplies Rise” / “Samsung, Labor Union to Meet in 'Last Chance' to Avert Strike” (May 12 and 17, 2026)
• Tom's Hardware, “Samsung's critical union negotiations break down” / “Samsung starts winding down chip production” (May 13 and 15, 2026)
• Fortune, “A 45,000-person labor strike at Samsung's memory chip plants could throw a wrench into the AI boom” (May 17, 2026)
• TrendForce, “Samsung's May Strike Seen Disrupting Up to 4% of DRAM Output” / “Samsung Reportedly Begins Preemptive Strike Measures on May 14” (April 27 and May 15, 2026)