Morning Edition

As of August 18, 2026 5:30 JST

Japan market: Open / US market: Regular session

TSE Regular Trading, Oil and Yield Pressure, and Mitsui Mining Copper Foil Expansion

Three Key Market Drivers Today

  1. On August 17, US major indices closed lower under pressure from higher crude oil and rising Treasury yields, though chipmakers advanced with the SOX index up 1.68%.

  2. USD/JPY traded in the low-159 range with the US 10-year Treasury yield at 4.724%. China July industrial output and retail sales both came in below market expectations.

  3. Mitsui Mining & Smelting unveiled plans to expand copper foil production for AI servers beyond 2030, and Oasis Management disclosed a 5.00% stake in Dentsu Soken.

The Tokyo Stock Exchange conducts regular trading on August 18. Covering disclosures from 15:30 JST on August 17 to 05:30 JST on August 18, we review Bank of Japan foreign exchange conditions, the three major US indices on August 17, and TSE Prime post-close disclosures based on primary sources.

Japan Markets

TSE Regular Trading on August 18

August 18 is not a market holiday on the JPX calendar, and the TSE conducts regular trading.

FX, Rates & Macro

FX and Macro Conditions on August 17

USD/JPY hovered in the low-159 range while the US 10-year Treasury yield rose to 4.724% and WTI crude traded at 84.66 dollars.

US Markets

Final closing values for August 17 are used.

NASDAQ-100

NDX · Close

29,995.38

−43.44−0.14% (down)

NASDAQ Composite

COMP · Close

26,644.91

−77.32−0.29% (down)

PHLX Semiconductor

SOX · Close

12,621

+208.84+1.68% (up)

US Stocks Weaken While Semiconductors Outperform

On August 17, the Dow fell 0.51% and the S&P 500 dipped 0.52%, while the SOX index gained 1.68% supported by Micron and Applied Materials.

Prime Companies

Mitsui Mining and Smelting Co., Ltd. (5706)

Outlook for Expanding Copper Foil Production Capacity Beyond 2030

Disclosed on August 17. Provided an outlook on production capacity expansion for electrodeposited copper foil for semiconductors to meet growing generative AI demand, while noting that capital expenditures are under ongoing review.

DENTSU SOKEN INC. (4812)

Oasis Management Reports 5.00% Stake

Disclosed on August 17. Large shareholding report showed fund Oasis Management holding a 5.00% stake. The stated purpose is portfolio investment and potential important management proposals depending on dialogue.

PARK24 Co., Ltd. (4666)

July Monthly Times Parking Sales at 108.9% YoY

Disclosed on August 17. Times Parking sales in July rose 8.9% YoY. The company operates 20,490 parking sites with 567,110 spaces.

Disclaimer

Market Flow presents curated public information for reference and does not provide investment advice or recommendations regarding financial instruments. It does not recommend the purchase or sale of specific financial products, nor does it provide independent future forecasts.