Samsung, Nvidia lift S Korean stocks 8.4%

South Korean stocks jumped on May 21, with the KOSPI rising 8.42% to 7,815.59 in Seoul.

The rally came after Samsung Electronics reached a tentative wage deal that helped avert a strike, while strong earnings from Nvidia boosted chip and robotics shares.

Program trading in KOSPI 200 futures was paused for five minutes after futures stayed above 5% for more than a minute.

Institutions bought a net 2.9 trillion won (US$1.91 billion) and foreign investors sold a net 233.1 billion won (US$154 million).

Samsung rose 8.51%, SK hynix gained 11.17%, Hyundai Mobis climbed 25.23%, LG Electronics added 29.83%, Hyundai Motor rose 12.5%, and Kia gained 12.38%.

The won closed at 1,506.1 against the US dollar, up 0.7 won (US$0.0005) from the previous session.

🔗 Source: Yonhap

🧠 Food for thought

Implications, context, and why it matters.

The rally ran on heavy borrowing and relief over averted disruption

The KOSPI’s one-day jump landed in a market swinging hard 1.
Retail investors added fuel through borrowing, pushing margin loans to a record 36.4 trillion won (US$24 billion) 2.
Samsung’s tentative wage deal did more than settle a pay dispute. It headed off a planned strike after the union asked for 15% of pre-tax operating profit as a mandatory bonus pool 1.
An earlier half-day walkout cut Samsung’s memory chip output 18.4% and foundry output 58.1%. A full strike risked disrupting chip supply chains worldwide 2.

‘Physical AI’ is changing how Korea’s industrial groups are valued

Sharp gains in Hyundai and LG shares came as investors priced in a shift toward “physical AI,” which applies AI to robots and machines in the real world beyond their legacy industrial lines.
Hyundai Motor Group plans yearly capacity for 30,000 robots by 2028. It also said it would place about 25,000 Atlas humanoid robots, human-shaped robots developed by Boston Dynamics, in its factories from 2028 3.
That push lines up with Hyundai Motor Group’s pledge to invest 125.2 trillion won (US$86.7 billion) in Korea through 2030 3.
LG Electronics is turning all 29 global factories into AI-powered smart sites with Nvidia’s digital twin technology, which creates virtual copies of real factories to test and improve operations 2.