U.S. commodity exporters and pharmaceutical companies are among the top traders, with Japan casting a cautious eye toward the foreign exchange markets, in the coming days.

Top exporters with significant Japanese interests includeExxon Mobil Corp(NYSE:XOM) andChevron Corp(NYSE:CVX).

The weak yen which, on Wednesday, fell to a 34-year low against the dollar, has been a boon for Japanese exporters, but it makes the country's imports more expensive.

But it's a stable economy with low — almost non-existent — levels of inflation, which make it an attractive investment location for many U.S. companies.