Foreign exchange intervention cannot save the yen, and the return of pension funds to Japan may become the sharp sword of breaking the deadlock of depreciation. The cost may be global stock and bond volatility.

Did Japan finally pick up the emergency hammer and smash the glass dome with "strengthening the yen here" written on it? Japanese Finance Minister Matsuyama Kohzuki created a real surprise on Friday. She announced at the end of a routine press conference that the government would promote relevant policies to encourage large-scale pension funds to increase their investment in Japanese domestic assets. She revealed few details and did not directly mention the yen. However, in Japan, a country where almost all policies, from economic growth plans to Japan's central bank's rate hike arrangements, are carefully leaked to the media in advance, the sudden announcement of this news by a top-level finance ministry official indicated that Matsuyama Kohzuki wanted to preserve the unexpected effect, rather than frequently using US Treasury assets to intervene in the foreign exchange market as speculators expected. The market responded as well, with the yen appreciating towards 161 yen to 1 US dollar, and Japanese domestic bond prices also showing an upward trend. In the eyes of Japanese finance ministry and even Bank of Japan policymakers, the first step to repairing the yen may not be to once again extend the "intervention hand," but to encourage the massive Japanese pension fund assets held overseas to flow back into domestic assets. Between April 28 and May 27, the Japanese Finance Ministry has spent a record 11.73 trillion yen (727 billion US dollars) to defend the yen, but after that, the yen quickly depreciated to near a 40-year low, turning the Japanese government's trillion-yen intervention during the period mentioned above into a bubble. The US dollar briefly broke above 162 yen this week, meaning the yen was approaching its weakest level since 1986. Wall Street financial giant Goldman Sachs raised its 12-month US dollar to yen forecast from 155 to 165, essentially admitting that "historic undervaluation" does not mean an immediate bottom, and the 200 yen level has shifted from "unthinkable" to a significant tail risk in the medium-term investment view. The real policy signal released by the Japanese government is that the yen defense battle may shift from short-term foreign exchange market price intervention to a more sustainable national balance sheet restructuring. Even if only 2% to 5% of total assets are transferred back to Japan from overseas, a mechanical calculation is equivalent to about 5.9 trillion to 14.7 trillion yen, a scale comparable to the 11.73 trillion yen spent by the Japanese authorities during the period from April 28 to May 27 for foreign exchange intervention. The differentiating factor is that direct intervention involves a large-scale purchase of yen over a period of time, while pension fund adjustments can result in a more stable flow of capital through measures such as reducing overseas asset purchases, increasing currency hedging, and increasing domestic asset holdings. Nevertheless, in the eyes of significant Western economies such as the United States, the yen's appreciation may not only compress the profits of Japanese export companies, leading to inflation in major consumer countries such as the US, but also the reduction in overseas assets by the Japanese government's pension investment fund (GPIF) may also lead to a severe sell-off in US bonds and global stock markets. The inflow of Japanese pension funds may become the "real savior" of the yen: 29.36 trillion yen in funds may reshape Japan's stock, bond, and foreign exchange pricing. Despite this, the idea has been circulating in the market for months: the government can push for the Government Pension Investment Fund, which manages around 293.6 trillion yen (approximately $1.81 trillion) in assets, as well as other pension funds that follow its investment portfolio to allocate more of their investments into domestic assets. This is the most sensible step to support the yen. For over two years, we have been hearing that the Bank of Japan must raise interest rates to narrow the interest rate differential with the United States in order to promote yen appreciation. However, after five consecutive rate hikes, with the policy rate target reaching its highest level since 1995, the yen is now weaker than it was during the negative interest rate period. For years, this reality has been disconnected from the fundamentals; what is truly needed now is a change in market narrative. The same is true for South Korea: despite a faster and higher increase in borrowing costs, the country's currency has not been supported. At the same time, foreign exchange intervention can only be a short-term tool. Japan launched interventions during the Golden Week holiday period where market liquidity was thin, achieving significant short-term effects. This strategy made the Japanese government appear quite wise in the short term; however, it did not fundamentally change the direction of the yen. Encouraging the Government Pension Investment Fund to adjust its allocation is not only beneficial for the yen. A large and stable domestic buyer can help stabilize the volatile Japanese government bond market and suppress concerns about the exaggeration of Japan's fiscal situation through stable demand. More importantly, at a time when Japan urgently needs significant investments in building AI computing infrastructure and revitalizing semiconductor production capabilities to return to its heyday, Japan should benefit more from the returns it can obtain domestically rather than continuing to invest capital overseas. Former Prime Minister Shinzo Abe's push for the Government Pension Investment Fund to increase its overseas investment was the correct policy for Japan at a time when the country was in a deflationary state. At that time, Japan's 10-year government bond yield was only 0.5%, and the Nikkei 225 index was hovering around 15,000 points. The adjustments made at that time resulted in the funds withdrawing from Japanese government bonds, which once accounted for two-thirds of their investment portfolio, and reallocating them to overseas bonds and domestic and foreign stocks. This strategy proved effective: thanks to long-term and careful investment choices, the future outlook of Japan's pension fund system has significantly improved. However, the current situation is entirely different. The fund still has about half of its assets allocated overseas, meaning it can bring back some of these funds domestically without sacrificing diversification. After experiencing nearly zero interest rates for decades, Japan has entered into a "room with interest rates," where domestic assets are now attractive enough to keep more funds within the country; otherwise, Japanese savers may miss out on the opportunities for domestic economic recovery. In the stock market, shareholder returns have increased significantly, corporate governance reforms continue to progress, and the Nikkei index has risen to around 70,000 points. While the volatility of Japanese government bonds may be high, headlines proclaiming "soaring to a 30-year high" should not be concerning. After nearly 30 years of suppressed benchmark interest rates, these fluctuations are merely bumps on the road to normalizing financial environments and monetary policy paths. The absolute level of Japanese government bond yields is not astonishing, and increased holdings by the government pension investment fund may even lead to a slight decrease in yields. However, the yield spread between Japanese and US government bonds has significantly narrowed, and for a fund paying its pensions in yen, continuing to chase diminishing yields and US dollar asset premiums in overseas markets while facing exchange rate risks may no longer provide sufficient justification. Reduced outflows of overseas funds, thereby easing yen pressure, will only be an incidental benefit of this policy. However, the government must proceed with caution. It is not much of a secret that the current government actually wants the yen to remain relatively weak and sees around 150 yen to 1 US dollar as the ideal range, as this level would encourage domestic investment as advocated by Prime Minister Koizumi. Officials will be vigilant to prevent the market from adjusting too quickly in the opposite direction, so as not to disrupt corporate capital expenditure plans. Currently, it is unclear what the specific plans of Matsuyama Kohzuki are. The Government Pension Investment Fund is regulated by the Ministry of Health, Labour, and Welfare, and there are no arrangements for a portfolio rebalancing in the near future. Any attempts to push for a rebalancing of the portfolio are likely to be viewed negatively as government intervention in pension savings and would require a significant amount of political capital, as well as a cautious approach; a similar adjustment in the past took several months of review before being implemented. However, from a directional perspective, this is a move that aligns with the interests of all parties involved. If Japan aims to build an industrial country post-deflation era, then the capital group formed by domestic and overseas investments in Japan should share in the benefits. From capital outflow to investing in Japan: If the world's largest pension fund switches direction, it may trigger a new round of yen appreciation and global asset reconfiguration. As mentioned earlier, the real policy signal released by the Japanese government is that the yen defense battle may shift from short-term foreign exchange market price intervention to a more sustainable national balance sheet restructuring. As of the end of March 2026, the Government Pension Investment Fund (GPIF) manages approximately 293.6 trillion yen (about $1.8 trillion) in assets, with roughly equal allocations to domestic bonds, foreign bonds, domestic stocks, and foreign stocks, meaning about half of its funds are still allocated overseas. Even if only 2% to 5% of total assets are transferred back to Japan from overseas, a mechanical calculation is equivalent to about 5.9 trillion to 14.7 trillion yen, a scale comparable to the 11.73 trillion yen spent by the Japanese authorities during the period from April 28 to May 27 for foreign exchange intervention. However, the real difference lies in the fact that direct intervention involves a one-time purchase of yen, while pension fund adjustments can result in a more stable flow of capital through measures such as reducing overseas asset purchases, increasing currency hedging, and increasing domestic asset holdings. This also explains why the market quickly responded but still refuses to fully believe that this "trillion-dollar ace" will be played out. After Matsuyama Kohzuki's statement, the yen briefly appreciated by about 0.6% to 161.44 yen to 1 US dollar, and the yield on Japan's 10-year government bond fell by 10 basis points to 2.775%, indicating that traders have begun to price in the possibility of a "return of domestic long-term buyers." However, the government has not disclosed the target allocation ratios, execution timetable, whether funds will be transferred back from overseas assets or only adjusting incoming cash flows, or whether there will be an increase in currency hedging ratios. The primary responsibility of the GPIF is still to achieve long-term returns on pension funds with the necessary minimum risk rather than serving as a tool for the Ministry of Finance's foreign exchange intervention. Therefore, without specific weight adjustments and institutional procedures, the policy statement can only temporarily change the negative narrative of the continuing depreciation of the yen and is not enough to completely reverse the trend. If the policy is actually implemented, the impact on Japanese assets will show significant differentiation. The yen will gain more reliable medium-term support than verbal intervention, Japanese government bond yields will decrease due to increased stable demand, mitigating the risk of long-term yield rate control caused by expansionary fiscal policy; overall, Japanese stocks will also benefit from the inflow of funds from domestic institutions, but the appreciation of the yen may weaken the overseas profits of export companies, so it will be more favorable for domestic companies engaged in financial services, domestic consumption, capital expenditure, corporate governance reforms, and increasing shareholder returns rather than favoring all constituents of the Nikkei 225 index indiscriminately. Global markets should also not underestimate the spillover effects. If the GPIF gradually reduces its allocation to foreign bonds and stocks, the marginal demand of Japanese funds for US government bonds and other overseas risky assets may diminish, leading to the closure of some yen carry trade financing transactions; this will undoubtedly exert significant potential pressure on global long-term government bond yields and overvalued AI-powered technology stock assets. However, as long as the adjustment is done gradually over several years, the main outcome is more likely to be the normalization of Japanese asset valuations, moderate yen appreciation, and a marginal rebalancing of global capital flows, rather than significant liquidity shocks. The key indicator to watch is not the next speech by the finance ministry, but whether the GPIF formally changes its basic investment portfolio, the weight of overseas assets, and currency hedging policiesonly when funds truly flow back into Japan will this "trillion-dollar ace" transform from policy rhetoric into a capital force capable of altering global asset pricing.