The Japanese yen strengthened sharply against the U.S. dollar on Sept. 3, 2026, reviving investor interest in Japan-focused currency ETFs.

The move came as markets assessed whether authorities had conducted a rate check or were preparing for further action, while hawkish comments from Bank of Japan ("BOJ") officials strengthened expectations of higher Japanese interest rates.

Here’s How the United States Contribute to the Surge

The United States and Japan carried out a rare coordinated intervention to support the yen on July 30, 2026. The move was mainly aimed at stabilizing Japan’s currency. But the U.S. involvement also reflected concerns about the stability of the U.S. Treasury market.

Note that if Japan were to sell large amounts of U.S. Treasuries to obtain dollars for yen purchases, the resulting selling pressure could drive Treasury prices lower and push yields higher.

To reduce this risk, Japan plans to use the Federal Reserve’s FIMA repo facility to access dollar liquidity without selling Treasuries, helping limit pressure on U.S. bond markets and support global financial stability.

BOJ Policy Becomes the Key Catalyst

BOJ board member Hajime Takata said that the central bank should raise interest rates nimbly in response to intensifying inflationary pressures rather than follow a fixed schedule. BOJ Governor Kazuo Ueda has also indicated a strong possibility of a rate hike this month, according to Reuters.

ETFs in Focus

For ETF investors, the intervention carries important implications for yen ETFs, U.S. Treasury ETFs and Japan equity ETFs.

Yen ETF

Invesco Currencyshares Japanese Yen Trust (FXY Quick QuoteFXY - Free Report) is likely to benefit from the move. A stronger yen is a positive for the fund, as the fund offers direct exposure to the currency.

FXY has assets under management worth $435.40 million and an expense ratio of 0.40%. The fund trades at an average daily volume of 252,302 shares. FXY currently has a Zacks ETF Rank #2 (Buy). FXY has risen 2.7% over the past five days.

U.S. Treasury ETFs

In the immediate term, yen intervention and the use of FIMA repos are supportive for U.S. Treasury ETFs because they reduce the risks of forced Japanese Treasury selling. But if the yen strengthens further because the BOJ hikes rates, the longer-term effect could reverse as Japanese investors may repatriate funds and carry trades may unwind, pushing U.S. Treasury yields higher, thus hurting treasury ETFs’ prices.

iShares 20+ Year Treasury Bond ETF (TLT Quick QuoteTLT - Free Report) is one of the most widely traded U.S. bond ETFs. It provides exposure to long-term U.S. Treasury bonds with maturities of 20 years or more, making it a popular choice for risk-averse investors.

TLT has assets under management worth $47.30 billion and an expense ratio of 0.15%. The fund trades at an average daily volume of 27.63 million shares. TLT presently has a Zacks ETF Rank #3 (Hold). TLT has fallen 0.9% over the past five days.

Japan Equity ETFs

A stronger yen weighs on Japanese exporters because their overseas earnings become less valuable in yen terms. Japan equity ETFs’ gains may be suppressed.

iShares MSCI Japan ETF (EWJ Quick QuoteEWJ - Free Report) is the largest and one of the oldest U.S.-listed ETFs focused exclusively on Japanese equities. It gives investors broad exposure to large and mid-cap Japanese companies.

EWJ has assets under management worth $22.65 billion and an expense ratio of 0.49%. The fund trades at an average daily volume of 4.88 million shares. EWJ presently carries a Zacks ETF Rank #3. EWJ has gained 1.6% over the past five days.