Hedge funds have dramatically increased their short positions on the Japanese yen ahead of a snap election, with the scale of the buildup marking the largest in a decade, reflecting intensifying investor bets on the election outcome and its implications for fiscal policy. Data from the Commodity Futures Trading Commission shows that leveraged funds boosted their net short yen positions by 35,624 contracts in the week ending January 13, the largest weekly increase since May 2015. This sharp reversal is particularly notable, coming after hedge funds had either reduced or maintained their short yen positions for four consecutive weeks. The yen fell last week to its weakest level since July 2024, primarily influenced by the prospect of a snap election. On the 19th, Japanese Prime Minister Sanae Takaichi formally announced the dissolution of the House of Representatives on January 23, seeking a voter mandate to continue her administration, with an election scheduled for February 8. The current term for members of Japan's House of Representatives was originally set to expire in October 2028.

Traders are betting that Prime Minister Sanae Takaichi is likely to win the election, and her advocacy for more aggressive fiscal stimulus measures could lead to a further widening of Japan's fiscal deficit. Expectations of looser fiscal policy have diminished the yen's appeal, prompting hedge funds to increase their short positions. Hiroyuki Machida, head of foreign exchange and commodity sales at ANZ in Tokyo, stated, "This data is sufficient for the authorities to prove that the recent rise in the dollar-yen pair is driven by speculation. This means the conditions for forceful intervention are increasingly falling into place." The yen's depreciation has heightened market focus on the possibility of intervention by Japanese authorities. The yen's exchange rate is approaching the key level of 160 yen to the U.S. dollar, near which Japanese authorities last intervened in the foreign exchange market. Hiroyuki Machida pointed out that the latest positioning data provides authorities with ample evidence that the recent yen weakness is primarily driven by speculative activity rather than fundamental factors, offering policymakers a stronger rationale for taking forceful intervention measures.