Now I have all the confirmed macro events and calendar dates. Let me write the post.

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The month in Asia Pacific markets

Asia Pacific markets split cleanly in two during May 2026 — the semiconductor-exposed north surged while the commodity- and consumption-heavy south stalled. South Korea’s KOSPI led the region at +28.4%, closing at 8,476.2, followed by Taiwan’s TWSE at +14.9% (44,732.9) and Japan’s Nikkei 225 at +11.9% (66,329.5). At the other end, Hong Kong’s Hang Seng fell 2.3% to 25,182.4, India’s Nifty 50 dropped 1.9% to 23,547.8, and Shanghai’s Composite slipped 1.1% to 4,068.6. Australia’s ASX 200 barely moved, adding 0.8% to 8,731.7 against the headwind of a third consecutive RBA rate hike. Singapore’s Straits Times gained 2.5% to 5,037.9, steady as usual.

The single dominant theme was AI-driven semiconductor demand. Every market with a large chip supply-chain weight rallied hard; every market without one treaded water or fell.

Winners and losers

SK Hynix (000660.KS) was the standout mover in all of Asia Pacific, climbing 81.4% in a single month as the company’s HBM memory chips — the bottleneck component inside every AI accelerator — pushed its market capitalisation past the trillion-dollar mark. Samsung Electronics (005930.KS) followed at +43.8%, and Hyundai Motor (005380.KS) added 36.7% as Korean retail investors flooded leveraged semiconductor ETFs. In Taiwan, MediaTek (2454.TW) rose 65.1% after doubling its 2026 data-centre revenue forecast to $2 billion, while Hon Hai Precision (2317.TW) gained 31.7% and ASE Technology (3711.TW) added 27.8% — the entire AI packaging chain repricing at once.

Japan’s contribution came through SoftBank Group (9984.T, +43.5%), which surged over 30% in two sessions after Nvidia’s blockbuster Q1 earnings confirmed the AI infrastructure cycle SoftBank is betting on. Tokyo Electron (8035.T) added 18.1%.

The decliners told a different story. CSL Limited (CSL.AX) fell 22.3%, the worst in the 92-stock scan. Hikvision (002415.SZ) dropped 13.9% and Wuliangye (000858.SZ) lost 12.6% — Chinese consumer and tech names under pressure from absent stimulus and EU trade friction. PetroChina (601857.SS) and CNOOC (0883.HK) fell 11.0% and 10.1% respectively as crude corrected. State Bank of India (SBIN.NS) declined 8.1% alongside the broader Nifty selloff.

What drove May 2026

Three forces defined the month. First, the AI memory supercycle entered a new phase. SK Hynix and Samsung together now comprise over half of KOSPI’s market capitalisation — a concentration that explains nearly all of Korea’s 28.4% index-level move. The demand pull from Nvidia’s supply chain repriced every node from wafer fab to advanced packaging.

Second, the Trump–Xi Beijing summit on May 14–15 produced Boeing orders and agricultural purchase commitments but left the existing 30% US tariff on Chinese goods untouched. Trump told reporters he “didn’t discuss tariffs.” The market read: no escalation, but no relief either. China’s Hang Seng sold off 1.6% on May 15 as the outcome landed.

Third, central banks stayed tight. The RBA hiked 25 basis points to 4.35% on May 5 — its third consecutive increase this year — responding to inflation at 4.6%. The Bank of Korea held at 2.50% on May 28 in a 5-2 vote where two members voted to hike, a hawkish tilt under new Governor Shin Hyun-song. The PBoC held both LPR rates unchanged on May 20 for the twelfth consecutive month, offering zero new stimulus.

June 2026 outlook

The setup heading into June is bifurcated. Korea and Taiwan carry strong momentum but extreme concentration risk — a single disappointing HBM order book update could reverse weeks of gains. China and India enter the month looking for a catalyst that May failed to deliver.

The calendar is back-loaded. The Reserve Bank of India announces its MPC decision on June 5, with the repo rate expected to hold at 5.25% for a third straight meeting — the rupee and crude are the variables to watch. Then comes the busiest 48-hour window of the quarter: the Bank of Japan meets June 15–16 (current rate 0.75%, with three dissenters wanting 1.00% at the April meeting), the RBA decides on the same day, and the US Federal Reserve concludes its meeting on June 17. All three decisions land within one Asia trading session on the morning of June 18 — a volatility event for FX and equity futures across the region.

The PBoC’s monthly LPR fixing on June 20 is the next read on whether Beijing will finally break its 12-month hold. China’s NBS Manufacturing PMI at month-end rounds out the data calendar. On the trade front, the USTR’s Section 301 four-year review comment window opens June 24 — the first procedural step that could signal a shift in the US tariff framework ahead of the November truce expiry.

What we’re watching

Korea’s concentration test. KOSPI added 28.4% on two stocks. Any air pocket in HBM orders, DRAM pricing, or Nvidia guidance will test whether the index has breadth underneath. The absence of a Bank of Korea meeting in June means no policy circuit-breaker if the won moves sharply.

The June 16–17 triple bank window. BOJ, RBA, and FOMC within 48 hours. The Nikkei’s reaction to any BOJ hawkish signal, and the Australian dollar’s path after a potential RBA pause, will set the regional tone into Q3.

China’s stimulus question. Twelve months without an LPR cut while the Shanghai Composite drifts lower. The June 20 fixing and end-of-month PMI will either confirm stasis or finally deliver a policy shift.

India’s rupee anchor. The Nifty’s 1.9% May decline traced directly to the rupee’s weakness past 96/USD. The RBI’s June 5 decision — and more importantly its forward guidance on FX intervention — is what matters for the equity market.