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2025年10月08日

Investors Trading Trends in Japanese Stock Market:An Analysis for September 2025

金融研究部 研究員 森下 千鶴

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In September 2025, the Nikkei 225 rose for the sixth consecutive month, reaching a new all-time high. In early September, the market gained momentum, supported by the rise in U.S. equities led by high-tech stocks and growing expectations for expansionary fiscal policies under the next administration following Prime Minister Ishiba’s resignation. The Nikkei surpassed 44,000 on the 11th and exceeded 45,000 on the 18th. Although the index temporarily declined on the 19th after the Bank of Japan announced plans to sell ETFs and J-REITs, reassurance that the pace of sales would be gradual helped the market recover quickly. Toward the end of the month, while the rapid pace of gains and a pause in yen depreciation led to some consolidation, the Nikkei maintained high levels and ended the month at 44,933. By investor type, business corporations were net buyers, while trust banks, foreign investors, and individuals were net sellers (as shown in Figure 1).
Figure1 Trading Trends by Major Types of Investors
The trading by type of investors in September 2025 (September 1 to 26) shows that business corporations were the largest net buyers, with a total net purchase of 693.5 billion yen in cash equities and futures (as shown in Figure 2). Stable buying, mainly through share buybacks, continued, marking their 52nd consecutive month of net buying.
Figure2 Business cos. as net buyers for 52 consecutive months
On the other hand, trust banks were the largest net sellers in September, with a total net sale of 1.31 trillion yen in cash equities and futures (as shown in Figure 3). This was likely reflecting pension fund rebalancing amid the firm stock market.
Figure3  Trust banks Remain Net Sellers
In September, foreign investors turned to net sellers for the first time in five months, with a total net sale of 956.5 billion yen in cash equities and futures (as shown in Figure 4).
Figure4 Foreign Investors: Net Sellers for the first time in Five Months
Furthermore, individuals were also net sellers, with a total net sale of 243.1 billion yen in cash equities and futures (as shown in Figure 5). Profit-taking dominated as the Nikkei traded near record-high levels.
Figure5 Individuals: Net Sellers for Seven Consecutive Months

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(2025年10月08日「研究員の眼」)

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金融研究部   研究員

森下 千鶴 (もりした ちづる)

研究・専門分野
株式市場・資産運用

経歴
  • 【職歴】
     2006年 資産運用会社にトレーダーとして入社
     2015年 ニッセイ基礎研究所入社
     2020年4月より現職

    【加入団体等】
     ・日本証券アナリスト協会検定会員
     ・早稲田大学大学院経営管理研究科修了(MBA、ファイナンス専修)

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【Investors Trading Trends in Japanese Stock Market:An Analysis for September 2025】【シンクタンク】ニッセイ基礎研究所は、保険・年金・社会保障、経済・金融・不動産、暮らし・高齢社会、経営・ビジネスなどの各専門領域の研究員を抱え、様々な情報提供を行っています。

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