1. Semiconductors

The competitive centre of gravity in memory chips is shifting as the industry moves into HBM4 (High Bandwidth Memory, fourth generation). Design, foundry manufacturing, and advanced packaging are now as consequential as the chips themselves. Samsung Electronics is producing HBM4 base dies at its own foundries using 4nm and 2nm processes. SK Hynix, by contrast, is relying on TSMC's 12nm and 5nm nodes. Micron, meanwhile, is co-developing customised HBM with Nvidia. On the packaging front, Amkor Technology has signed a multi-year advance-payment contract with Nvidia worth $1.5bn.

2. Substrates

Samsung Electro-Mechanics announced on 28th September that it would invest a total of 6.78 trillion won in expanding capacity for FC-BGA (flip-chip ball grid array) substrates used in AI servers and data centres. Of that sum, 4.27 trillion won — equivalent to 43.6% of the company's equity — will go into its Sejong plant in South Korea, with a further 2.51 trillion won directed to its Vietnamese subsidiary. The Sejong production line is scheduled to begin mass output in September 2028, with total investment in that facility expected to reach roughly 8 trillion won by 2040. The financing structure involves global big-tech customers covering a portion of the capital expenditure in exchange for guaranteed long-term supply. On the same day, the company also disclosed a major single supply contract, though neither the counterparty nor the contract value was made public. Its shares closed up 1.28% at 1,581,000 won on 2nd October.

3. Shipbuilding

Samsung Heavy Industries secured an order for two large gas carriers from a Bermuda-based shipowner, valued at 307.4bn won. The company's cumulative commercial vessel orders for the year now stand at 44 ships worth $7.5bn — equivalent to 132% of its full-year target of $5.7bn. On the same day, HD Hyundai Heavy Industries closed up 4,500 won (1.05%) at 433,500 won, buoyed by news of a tentative labour agreement and the launching ceremony of an Aegis destroyer. Samsung Heavy Industries rose 1.91% to 19,700 won, while Hanwha Ocean gained 0.25% to 78,800 won.

4. Internet

Kakao entered the subscription wars on 1st October with its first integrated membership product, priced at 4,900 won per month. The offering takes aim directly at rivals Naver Plus and Coupang's Rocket WOW membership. Benefits include up to 70,000 shopping points per month, a choice between an emoji subscription or 130GB of cloud storage, cashback on stock-trading commissions, and handset screen-damage cover worth up to 70,000 won. New subscribers also receive domestic equities worth 4,900 won as a sign-up incentive.

5. Retail

A shortened Chuseok holiday — South Korea's major autumn festival, which ran for just four days this year, from 24th to 27th September — kept more consumers at home and away from overseas travel, channelling spending into domestic retail. Major department stores posted sales roughly 20% higher than a year earlier. Shinsegae led with a 21.6% rise, followed by Hyundai Department Store at 20.3% and Lotte Department Store at approximately 20%. Luxury jewellery (up 73%), watches (up 50.7%), large home appliances (up 50.2%), and children's goods (up 25%) were among the strongest categories.

6. Capital Markets

The KOSPI — South Korea's main stock index — closed at 7,003.74 on 2nd October, up 32.39 points (0.46%). The tech-heavy KOSDAQ slipped 1.00 point (0.11%) to 893.29. Share buybacks by Samsung Electronics and SK Hynix provided meaningful support, with corporate treasury buyers recording net purchases of 1.4886 trillion won and helping to underpin the index. Retail investors were net sellers of 1.8125 trillion won, foreign investors sold a net 83.4bn won, while domestic institutions bought a net 410.5bn won.