KOSPI Surges 4.3% to Record 7,822: How the AI Boom Builds Portfolios Through Memory Chips

On May 11, South Korea's KOSPI surged 4.32% to a record 7,822 points, briefly touching 7,899. SK Hynix rallied more than 11% and Samsung Electronics gained 6.33%. The driver was specific and measurable: Korean semiconductor exports rose 43.7% year-on-year in the first ten days of May, while chip shipments for AI servers increased by nearly 150% year-on-year, reaching an all-time record. Goldman Sachs raised its 12-month KOSPI target to 9,000 on the same day; JPMorgan sees a further 25%+ upside toward 10,000.

What is HBM and why it determines the AI race

To understand why Korean chips became the primary beneficiary of the AI boom, it helps to follow the supply chain:

Nvidia designs the GPUs that train and run large language models. A modern data-center GPU — Blackwell or H100 — can process trillions of operations per second, but it needs memory that can feed data at matching speed.

Standard DRAM cannot keep up. That is why HBM — High Bandwidth Memory — was developed: three-dimensionally stacked chips connected directly to the GPU in a single package. HBM3e delivers more than 1.2 terabytes per second of bandwidth, compared to roughly 100 GB/s for standard DDR5.

Who makes HBM? Primarily SK Hynix (the global leader, supplying Nvidia) and Samsung Electronics (rapidly closing the gap). Together they control more than 90% of the market. The KOSPI record is literally the market voting on real AI infrastructure volumes.

What the numbers say

A few concrete data points that explain the scale:

• Korean semiconductor exports in the first 10 days of May: +43.7% year-on-year
• AI-server chip shipments: +150% year-on-year, an all-time record
• Samsung Electronics crossed $1 trillion in market cap on May 6 — for the first time in its history, becoming only the second Asian company after TSMC in that club
• Samsung Q1 2026 operating profit: more than 8× year-on-year, approximately $40 billion in a single quarter

Goldman Sachs forecasts corporate profit growth in South Korea of 300% year-on-year in 2026 — almost entirely from semiconductors.

Why this matters beyond Korea

The KOSPI rally is not a local Korean story. It is a barometer for the entire AI infrastructure investment cycle globally.

When technology giants — Microsoft, Google, Meta, Amazon, xAI — increase their data-center capex, the money does not flow only to American cloud providers. It flows to GPUs (Nvidia, manufactured by TSMC), to HBM memory (SK Hynix, Samsung), and to server hardware. KOSPI is one of the cleanest public-market proxies for AI capex in the world.

If AI spending slows — or if companies realize they overestimated demand — KOSPI will be among the first major indices to reflect that. The reverse is also true.

What the major banks say

• Goldman Sachs raised its 12-month KOSPI target to 9,000 (from a current level of 7,822), citing earnings growth and the premium positioning of Korean manufacturers in the HBM supply chain
• JPMorgan said the rally could extend a further 25%+, with a potential path to 10,000
• Both banks emphasize: the 150% growth in chip export volumes is not a forecast — it is already-measured data from the first weeks of May

Practical takeaway for investors

Most retail investors will not have direct access to SK Hynix or Samsung through their broker. But there are several ways to gain comparable exposure:

• Korean market ETFs — the iShares MSCI South Korea ETF (EWY) holds Samsung and SK Hynix with a combined weight exceeding 40%
• Semiconductor ETFs — SOXX, SMH, and equivalents include the full chain from Nvidia to memory suppliers
• Nvidia shares — an indirect proxy: the more GPUs Nvidia sells, the more HBM the Koreans supply

One important caution: a 4.3% move in an entire national index in a single day is an extraordinary event. Such moves incorporate already-known positive news and raise the bar for what comes next. If the next AI-capex or chip-demand data disappoints, the correction can be symmetrically sharp.

---

Sources: CNBC — KOSPI hits fresh record · UPI — KOSPI surges to 7,800 · JPMorgan via CNBC — 25%+ upside to 10,000