KOSPI Sets All-Time High Above 7,380 as Iran Deal Report Sends Oil Crashing

KOSPI Breaks Into Uncharted Territory — And Oil Does the Opposite

Asian equity markets staged one of their most decisive rallies of 2026 on Wednesday, May 6, as a single geopolitical headline reshuffled risk pricing across the entire region in a matter of hours. Axios reported that the White House believes it is nearing a one-page, 14-point memorandum of understanding to end the U.S.-Iran war, the closest Washington and Tehran have come to an agreement since the conflict began on February 28. The market response was immediate and dramatic: Brent crude plunged 8%, WTI fell more than 9%, and equity benchmarks from Seoul to Sydney surged on the prospect of restored energy flows through the Strait of Hormuz.

The standout was South Korea. The KOSPI closed at 7,384.56, a gain of 447.57 points (+6.45%), marking the first time in the index’s history it has traded above 7,000 — let alone approached 7,400. The day’s session effectively rewrote the Korean equity record books, and the KRX triggered a buy-side sidecar in the morning session, a circuit mechanism activated when buy orders overwhelm the market’s absorptive capacity.

Japan’s Nikkei 225, returning from its three-day Golden Week holiday, gained a more measured 0.38% to 59,513.12. Chinese mainland indices, Hong Kong, and Taiwan all posted solid gains. Every major Asian market closed in the green.

South Korea: An All-Time High Built on Two Pillars

Wednesday’s KOSPI surge was not a one-dimensional event. Two independent catalysts converged to produce the 6.45% move:

1. Iran Peace Hopes — A Direct Stake for Korea

Korea is one of the world’s largest oil importers, and the Iran war has hit the country with particular force. In the weeks leading up to today, a Korean-operated HMM vessel sustained damage in the Strait of Hormuz, and Seoul had been internally reviewing whether to participate in the U.S. “Project Freedom” naval escort operation. Trump’s announcement on Tuesday that Project Freedom would be paused — citing progress toward a deal — made that review moot and sent a sharp positive signal to Korean markets that the direct operational risk to Korean shipping was receding.

Lower oil prices translate directly into reduced production costs for Korea’s export-oriented economy. Automakers (Hyundai, Kia), petrochemical firms, and logistics companies all benefit immediately when crude falls. The 9% single-day crash in WTI crude to around $92.90/bbl is the kind of energy cost relief the Korean economy has not seen since the conflict began.

2. The AI/Chip Boom — Samsung Joins the $1 Trillion Club

Overlaid on the geopolitical relief was a powerful sector narrative. Yonhap reported that the KOSPI surge past 7,380 was “buoyed by the AI boom,” with semiconductor and AI-adjacent stocks leading the charge. According to Korea Herald’s market desk, Samsung Electronics crossed the $1 trillion market capitalization threshold during Wednesday’s session, becoming Asia’s second trillion-dollar company after TSMC.

This was not a surprise in isolation — Samsung had been on a multi-week trajectory — but the combination of sector momentum and macro relief created a self-reinforcing dynamic. The Trump administration’s reported push to build a “Pax Silica” memory chip supply chain bloc anchored around U.S. allies including South Korea and Taiwan added a further policy tailwind for Korean chipmakers.

The KOSPI 200 — which over-weights large-cap industrials and tech — gained an even larger 7.62%, closing at 1,129.63, while the KOSDAQ edged down 0.29% to 1,210.17. The KOSDAQ’s slight underperformance reflects a market rotating into blue-chip chip names rather than smaller-cap growth names. The Korean won strengthened to 1,447.8 per dollar.

A note of caution: Korea Herald noted that record short positions are shadowing the KOSPI’s historic breakout, and a second “Money Move” wave — retail investors shifting from bank savings accounts to stocks — is now accelerating. These flows can amplify both upward and downward moves.

Japan: A Cautious Return From Golden Week

The Nikkei 225 reopened Wednesday after the Golden Week holiday block (Constitution Day May 3, Greenery Day May 4, Children’s Day May 5) and gained a relatively muted 0.38% to 59,513.12. The modest gain stands in contrast to the broader Asian surge, and reflects the Nikkei’s specific sensitivity to the yen: the currency strengthened sharply on risk-on flows and potential energy trade balance improvements, with USD/JPY falling to 155.92 (-1.94, -1.22%) — a meaningful move that compresses yen-denominated export earnings for companies like Toyota, Sony, and Fanuc when translated back to dollars.

Japan’s corporate sector faces a mixed picture from the Iran deal prospects. Komatsu, the construction equipment giant, had already warned that profits would fall 16% due to Iran-war-related supply chain costs and U.S. tariffs. A Hormuz reopening removes one headwind, but the tariff drag remains. Meanwhile, Japan is actively diversifying its energy sourcing toward Angola and African markets as a structural hedge — a strategy that will continue regardless of the Iran deal outcome.

China, Hong Kong, and Taiwan: The Chip Frenzy Connects the Region

Nikkei Asia headlined the day’s move as “Asian markets rally as Trump signals optimism for Iran deal,” and noted that “South Korea, Taiwan shares hit fresh highs amid chip frenzy.” Taiwan’s TAIEX rose 0.91% to 41,138.85, not far below its recent record territory, with TSMC and the broader Taiwan semiconductor supply chain continuing to draw investor confidence from the AI-driven capex cycle.

China’s Shanghai Composite gained 1.17% to 4,160.17, while the tech-heavy Shenzhen Component surged 2.33% to 15,459.62 — outperforming most regional peers. Beijing called on Iran to pursue a ceasefire, a diplomatic posture that aligns China’s stated interests with a de-escalation scenario. The Hang Seng Index gained 1.22% to 26,213.78.

Across the semiconductor supply chain, the Trump administration’s reported initiative to ease the memory chip crunch via a new supply chain alliance with the Philippines (“Pax Silica”) provided incremental positive context. Japan’s JSR announced plans to build a photoresist plant in Taiwan specifically to supply TSMC — a concrete sign that chip supply chain investment continues to accelerate regardless of macro headwinds.

The Macro Backdrop: Key Variables in Play

Beyond the Iran headlines, Wednesday’s session was shaped by a cluster of macro forces that investors should keep tracking:

Oil prices: Brent at $100.98 (-8.09%) and WTI at $92.90 (-9.16%) represent the largest single-day decline since the war began. The move is partly a catch-up — oil had already settled down 3.9%+ in the previous session. Copper gained 2.97%, a risk-on signal consistent with improved global growth expectations.
Currencies: The yen at 155.9/$ and the won at 1,447.8/$ both firmed, reflecting improved current account outlooks for both oil-importing nations as energy costs fall. The DXY dollar index weakened on a risk-on tone.
U.S. macro carryover: The previous week’s session on May 1 carried through — the Fed held rates at its May meeting with an 8-4 vote, core PCE remained elevated at 3.2%, but Apple’s strong earnings and Nasdaq’s resilience established a positive baseline for Asian risk appetite.
AI capex cycle: The persistent narrative of AI infrastructure spending — with TSMC, Samsung, and SK Hynix as primary beneficiaries — continues to provide a secular tailwind for Northeast Asian equities that is independent of the Iran situation.

What to Watch Next

The next 48–72 hours are critical. According to the Axios report, the U.S. expects Iran to respond on several key points of the 14-point framework within 48 hours. Markets are priced for resolution — if Iran’s response is non-committal or negotiations stall, oil could snap back sharply, and today’s equity gains would face a significant reversal test.

Five things to monitor:

Iran’s response to Washington’s 14-point memorandum (due within 48 hours per Axios)
KOSPI short positioning: Record short interest means a continued squeeze is possible, but also that a reversal could be vicious
BOK rate path: Lower oil sharply improves Korea’s inflation outlook; markets will reprice the Bank of Korea’s inflation trajectory and rate cut timeline
USD/JPY and the Nikkei correlation: If the yen continues strengthening toward 154–153, Nikkei earnings estimates will need downward revision despite the broader risk-on tone
Hormuz shipping normalization: Even if a deal is struck, ING’s commodities head Warren Patterson warned that “normalization in shipping and trade flows would still take weeks and weeks” — physical supply recovery will lag the market’s forward pricing

Track the global economic calendar for this week’s remaining U.S. data releases and any Fed commentary that could interact with the oil-driven inflation reset.

References

Track the data behind today’s moves

Today’s session was driven by oil prices, AI capex, and geopolitical risk repricing — all variables you can monitor in real time. Check crude oil prices, the Core PCE inflation trend, and the upcoming economic calendar on ECONPLEX to stay ahead of the next catalyst.

KOSPI Sets All-Time High Above 7,380 as Iran Deal Report Sends Oil Crashing — Asia Markets May 6, 2026