Japan’s activist investing market is entering a more challenging phase, with hedge funds finding it increasingly difficult to unlock value after several years of strong returns driven by sweeping corporate governance reforms, according to a report by Bloomberg.
While Japan remains the world’s second-largest market for shareholder activism after the US and continues to attract international capital, many of the easiest opportunities have already been exploited. The companies that remain are often those that have proved resistant to shareholder engagement, making campaigns longer, more costly and less likely to deliver rapid gains.
The report cites data compiled by Bloomberg as showing that stocks held by activist investors have underperformed the TOPIX index by an average of four percentage points during the first seven months of 2026, ending a four-year run of outperformance. The success rate of activist campaigns involving private equity-backed investments has also declined sharply, with only around 36% generating positive outcomes compared with nearly three-quarters in 2022.
Japan became a focal point for activist hedge funds following governance reforms introduced earlier this decade that encouraged companies to improve capital efficiency, unwind cross-shareholdings and increase shareholder returns. Many firms responded with larger share buybacks, higher dividends and balance sheet restructuring, creating significant opportunities for activist investors.
However, market participants now believe the remaining opportunities are considerably harder to execute.
Portfolio managers say the first phase of Japan’s governance reforms largely focused on companies holding excessive cash balances, non-core assets and inefficient capital structures. As those issues have been addressed across much of the market, activists are increasingly targeting businesses that have shown little willingness to compromise.
Recent campaigns illustrate the tougher environment. Oasis Management has struggled to persuade consumer goods company Kao to adopt its proposed reforms despite a multi-year engagement, while Elliott Investment Management has yet to receive a public response from Kansai Electric Power following calls for the utility to divest non-core assets.
At the same time, the universe of potential activist targets continues to shrink. Around one-third of TOPIX constituents now trade below book value, down from roughly half the index in 2022, reflecting both stronger corporate governance and higher Japanese equity valuations.
Larger activist hedge funds also face another constraint: growing assets under management require them to pursue bigger companies where potential returns may be less pronounced than in smaller-cap opportunities that characterised the earlier stages of Japan’s governance transformation.
The competitive landscape has also intensified as more activist managers have entered the market. Investors note that broad gains in Japanese equities, helped in part by the global artificial intelligence rally, have made it harder for activist portfolios to outperform benchmark indices.
At the same time, many Japanese companies have become more proactive in engaging with shareholders without waiting for activist intervention. Share buyback activity has increased significantly across the market, reducing the need for confrontational campaigns to unlock capital returns.
Corporate attitudes toward activism also appear to be hardening. While executives generally acknowledge that activist investors have contributed to improved governance standards, some companies are increasingly resisting campaigns they view as disruptive or overly aggressive.
Adding to the uncertainty is a subtle shift in Japan’s political landscape. Prime Minister Sanae Takaichi’s administration has emphasised long-term corporate value creation and expressed concerns about excessive short-term shareholder pressure. Proposed changes to governance rules and shareholder proposal processes have prompted some investors to question whether the regulatory environment will remain as supportive of activist strategies as it was during the initial reform period.
