Japan Market Desk records the Nikkei, TOPIX, the yen, Japanese government bonds, policy and the single market mover that best explains each Tokyo session.
The Nikkei surged behind AI and semiconductor heavyweights, but TOPIX rose only modestly and declining Prime Market shares outnumbered advancers at lunch. SoftBank Group gained more than 8%, making the concentration behind the headline advance impossible to miss.
SoftBank Group was the session’s market mover. The key was not merely that the Nikkei rose, but that it did so much faster than TOPIX and the broader market. This is market reporting, not investment advice.
The Nikkei and TOPIX both rose, but by sharply different margins. Market mover: SoftBank Group (9984). Theme: AI and semiconductors · index concentration · market breadth. SoftBank Group gained more than 8%, magnifying the Nikkei’s advance, while declining Prime Market shares still outnumbered advancers at lunch.
The Nikkei lost 2.09% over the week and TOPIX fell 1.05%. Market mover: the 10-year Japanese government bond. Theme: rates · yen strength · equity valuations. The yield reached 3% for the first time since 1996 as expectations of Bank of Japan tightening met a global bond selloff.
The September 3 close left the Nikkei down 0.17% and TOPIX up 0.50%. By 12:46 p.m. on September 4, the Nikkei was up 1.14% while TOPIX had closed the morning down 0.18%. SoftBank Group surged 10.27% at lunch, amplifying a tech-led rebound.
The Nikkei was only slightly higher around 1:00 p.m., while TOPIX gained 1.04% by lunch. Trading houses and financials, led by Mitsubishi Corporation, benefited as the bond selloff paused; a firmer yen and oil near $95 restrained the Nikkei.
The Nikkei fell 2.85% and TOPIX lost 2.40%. SoftBank Group dropped 6.42% as high oil, a 10-year yield above 3% and a stronger yen intensified the retreat from AI-sensitive growth shares.
After the August 31 close, the September 1 split widened: the Nikkei was down about 1.00% near 1:00 p.m. while TOPIX was up 0.52% at lunch. Tokyo Electron and other heavyweight chip shares weighed on the Nikkei as resource and rate-sensitive shares supported TOPIX.
The Nikkei fell 1.57% by lunch and TOPIX lost 0.43%. Selling in Advantest, Tokyo Electron and SoftBank Group showed how rising U.S. yields and global chip weakness can hit the price-weighted Nikkei harder than the broader market.
The Nikkei gained 0.59% for the week while TOPIX climbed 1.95%. Banks, insurers, automakers and domestic-demand shares gave the market breadth: TOPIX rose in all five sessions and finished the week on a seven-day winning streak.
The Nikkei was about 0.72% higher and TOPIX about 1.01% higher around 1:30 p.m. Advantest led the Nikkei’s positive contribution after Nvidia’s results, even as higher interest rates complicated the valuation picture.
The Nikkei slipped 0.15% by lunch while TOPIX edged up 0.09%. Advantest swung from adding ¥301.70 to the Nikkei the previous day to subtracting ¥197.91; no new company announcement was confirmed, so explanations centered on profit-taking and expectations are necessarily inferential.
The Nikkei gained 0.56% and TOPIX 0.61% by lunch, after both had risen 0.50% the previous day. Advantest led the Nikkei’s positive contributors as lower oil, softer U.S. yields and short-covering helped turn another weak open into gains.
The Nikkei gained 0.11% and TOPIX 0.33% by lunch. Fujikura rose 6.02% and added roughly 60.74 points to the Nikkei, extending interest in optical infrastructure for AI data centers despite no confirmed new company-specific catalyst that morning.
A lower Nikkei contrasted with a higher TOPIX. SoftBank Group was down 4.57% shortly after 1:00 p.m. as concern persisted over AI investment and financing; the stock had subtracted about 161 points from the Nikkei by lunch.
The Nikkei fell 3.93% for the week and TOPIX lost 3.10%. Rising global yields, higher oil and Middle East risk amplified swings in richly valued AI and semiconductor shares, and the Tuesday-Wednesday rout outweighed Thursday’s rebound.
The Nikkei was lower late in the morning while TOPIX was roughly flat to slightly higher. Asics fell 5.59% by 11:30 a.m.; after its strong earnings-driven run, higher global yields and profit-taking tested the valuation of high-growth consumer shares.
The Nikkei rebounded and TOPIX turned higher after the previous day’s fall. Daiichi Sankyo gained about 4.7% in early trading as calmer U.S. Treasury markets restored some risk appetite, though no new company-specific catalyst was independently confirmed.
Both the Nikkei and TOPIX fell. SoftBank Group was down 9.85% at 2:02 p.m. as weakness in U.S. AI shares, reports of roughly ¥1 trillion in bond issuance and high long-term rates converged.
Both benchmarks fell. INPEX rose 3.31% as Brent crude held above $91, separating energy shares from the broader decline and bringing Japan’s energy-security and import-inflation exposure back into focus.
The Nikkei was roughly flat while TOPIX fell. Mitsui Mining & Smelting rose more than 3% as nonferrous metals led the sector rankings, supported by strong first-quarter results and demand for copper foil used in AI hardware.
Both the Nikkei and TOPIX rose. Nintendo gained about 6.3% in a public delayed quote, with five million global sales of Pokémon Pokopia reinforcing confidence in the company’s software and intellectual-property ecosystem.
Advantest was the market mover as AI chips, semiconductor-testing equipment, the weaker yen, Bank of Japan expectations and index concentration shaped the session.
Tokyo’s cash market was closed for Mountain Day. The report reviewed an August 10 session led by Advantest and assessed AI chips, the weaker yen and Japanese government bonds ahead of the next open.
Fujikura led the session as investors focused on optical infrastructure for AI data centers, the yen, Bank of Japan policy and the Nikkei’s concentration in a small group of heavyweight shares.
Lasertec was the week’s market mover. The review examined AI-semiconductor expectations, the yen and the breadth of TOPIX after a sharp one-day rally against a less secure four-day backdrop.
