Apollo Management's chief economist Torsten Slok has cautioned about the potential unwinding of the yen carry trade. He pointed to recent sharp movements in speculative futures positioning. Speculative investors have reduced their net short position on the yen, which is the smallest bearish position in nearly a month. This signals potential volatility ahead for investors.

Slok's warning comes amid market speculation regarding potential intervention by Japanese and U.S. authorities to prevent further yen depreciation. This year, the Japanese currency has strengthened by 1% against the dollar. The carry trade involves borrowing in yen at low rates and investing in higher-yielding assets, a strategy that is now under scrutiny.

This matters because a rapid unwinding could trigger significant market shifts, impacting currency values and investment strategies. The Bank of International Settlements data indicates that yen lending to offshore financial centers remains high. Investors should watch the yen's performance and any policy actions by the Bank of Japan.