Samsung's $1 Trillion Market Cap & KOSPI 6300 Breakthrough: 4 Reasons the AI Semiconductor Rally Is Ending the 'Korea Discount'
On February 26, 2026, KOSPI broke through 6,300 for the first time in history and Samsung Electronics joined the $1 trillion market cap club. With the combined market cap of Samsung and SK Hynix surpassing 2,000 trillion won, is the AI HBM rally by Korea's semiconductor giants driving a structural revaluation of the Korean stock market?
Why You Need to Read This Now: On February 26, 2026, Korean stock market history was rewritten. KOSPI 6307, Samsung at ₩210,000 with a $1 trillion market cap — it's time to read the structural shift hidden behind these numbers.
TL;DR
- KOSPI closed at 6307.27 on February 26, setting an all-time high (+3.67%)
- Samsung Electronics +7.13%, first breach of the ₩210,000 level · market cap surpasses $1 trillion (world rank #12)
- SK Hynix +7.96%, ₩1,099,000 — just shy of ₩1.1 million
- Samsung + SK Hynix combined market cap surpasses 2,000 trillion won
- Background: Explosive HBM demand in the AI inference era + Nvidia earnings expectations
The Facts: What Happened
On Thursday, February 26, 2026, the KOSPI index surged 3.67% to close at 6307.27, setting a new all-time high.[[1]](https://www.donga.com/news/Economy/article/all/20260226/133432473/2) This added another 300 points just weeks after KOSPI first broke the 6,000 mark.
Samsung Electronics rose 7.13% to enter the ₩210,000 range for the first time. With a market capitalization of ₩1,290.48 trillion, it surpassed $1 trillion (approximately ₩1,428 trillion) when converted, overtaking Walmart and Eli Lilly to rank #12 in global market cap. SK Hynix also surged 7.96% to ₩1,099,000 — just below ₩1.1 million — recording a market cap of ₩783.26 trillion.[[2]](https://m.news.nate.com/view/20260226n33674?issue_sq=11391)
The combined market cap of the two stocks surpassed 2,000 trillion won. Hanmi Semiconductor also soared 28.44%, approaching its daily limit-up.
The Mechanism: Why Did It Surge Now?
1) The AI Inference Era: HBM Has Become the Bottleneck
Global investment bank Macquarie raised its target price for Samsung Electronics to ₩340,000 on this day. The core argument of the Macquarie report is that "memory has become the chokepoint of the AI inference era."[[3]](https://www.chosun.com/economy/economy_general/2026/02/26/XB2UYUI2ZZF3POBJUBONQTTKZA/) The analysis that HBM (High Bandwidth Memory) is the first bottleneck encountered when AI models perform real-time inference in data centers is spreading among global investment banks.
2) Nvidia Earnings Expectations
Nvidia's earnings announcement was scheduled after the U.S. market close on February 26. Expectations for strong results from Nvidia — at the very top of the AI chip supply chain — provided a tailwind for both Samsung and SK Hynix.
3) Simultaneous Buying by Foreigners and Institutions
The fact that the index surged sharply despite foreigners net-selling over 2 trillion won on the day shows the powerful buying from institutions and retail investors. This is evidence of how strong domestic investors' expectations for a re-rating of undervalued Korean semiconductors are.[[4]](https://imnews.imbc.com/replay/2026/nw2500/article/6803592_36989.html)
4) The National Pension Service Effect
One of the biggest beneficiaries of the KOSPI rally is the National Pension Service. According to an exclusive report, the NPS is estimated to have gained 127 trillion won in unrealized profits over just two months.[[5]](https://www.mk.co.kr/news/stock/11973235)
Context & Background: 4 Reasons the Korea Discount Is Ending
| Reason | Details |
|---|---|
| Enhanced Shareholder Returns | The 3rd Commercial Act amendment (mandatory treasury share cancellation) blocks the practice of treasury shares absorbing shareholder funds |
| AI HBM Monopoly | Samsung and SK Hynix control over 95% of the global HBM market |
| Global IB Target Price Upgrades | Successive re-ratings of Korean semiconductors by Macquarie, Goldman, and others |
| Political Risk Reduction | Impeachment and insurrection trials reaching conclusion phase, reducing foreign investor uncertainty |
Foreign media have also begun paying attention to the Korean market, describing it as "a clear change after years of being overlooked."[[3]](https://www.chosun.com/economy/economy_general/2026/02/26/XB2UYUI2ZZF3POBJUBONQTTKZA/)
Outlook: Can the Rally Continue?
Optimistic Scenario: If the AI data center investment cycle continues through 2027–2028 and Samsung stabilizes yields and supply at the HBM4 mass production stage, a $2 trillion market cap is theoretically not impossible.
Risk Factors:
- Nvidia earnings shock or a sudden surge in concerns about AI investment overheating could trigger a short-term correction
- Trump tariff / IEEPA uncertainty — scenario of renewed semiconductor export restrictions
- Won appreciation could put downward pressure on export companies' earnings
- Possibility of Samsung Electronics HBM4 yield delay issues resurfacing
Duration Estimate: Short-term correction is possible, but structural demand for AI semiconductors is projected to continue long-term (1–3+ years).