Who has been buying Hakuyosha Company, Ltd. stock?

6 distinct investors have filed 4 disclosed large-shareholding filings in Hakuyosha Company, Ltd. (9731), most recently on 2026-03-23. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.

How many insider filings does Hakuyosha Company, Ltd. have?

Hakuyosha Company, Ltd. has 4 buy-side and 6 sell-side disclosures on record, covering ¥1.2B ($7.6M) in total reported value, spanning 2021-12-07 to 2026-03-23.

Do insider buys in Japanese stocks predict returns?

Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Hakuyosha Company, Ltd. 9731

Company

株式会社白洋舎Hakuyosha Company, Ltd.

Investors

Buys

Total Value

¥1.2B ($7.6M)

Avg Return

+21.39%

Last Filing

2026-03-23

Hakuyosha Company, Ltd. (9731) has 4 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥1.2B ($7.6M) in reported transaction value. The earliest filing StockDrifts holds for Hakuyosha Company, Ltd. is dated 2021-12-07; the most recent is 2026-03-23. Across these filings the average return since disclosure is +21.39%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-03-23	BUY	unknown	株式会社みずほ銀行	strategic	127.4K	¥3,455	-1.6%	¥440M ($2.8M)
2026-03-23	BUY	unknown	みずほ信託銀行株式会社	other	84.7K	¥3,455	-1.6%	¥293M ($1.9M)
2025-07-04	BUY	Market Buy	武士道アセットマネジメント株式会社 BUSHIDO Asset Management Co., Ltd.	passive	254.0K	¥3,280	+3.7%	¥833M ($5.4M)
2024-02-07	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	127.4K	¥2,736	-24.3%	¥150M ($971K)
2024-02-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	57.9K	¥2,736	-	-
2023-06-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	182.4K	¥2,559	-	-
2023-06-07	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	57.9K	¥2,559	-32.9%	¥9M ($58K)
2023-06-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.6K	¥2,559	-32.9%	¥84M ($541K)
2022-07-22	SELL	Market Buy	第一生命保険株式会社 The Dai-ichi Life Insurance Company, Limited	passive	154.1K	¥1,280	-165.6%	¥59M ($380K)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	182.4K	¥1,851	-	-
2021-12-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	100	¥1,851	-83.7%	¥52M ($335K)
2021-12-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	61.1K	¥1,851	+83.7%	¥59M ($382K)
2021-12-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	36.3K	¥1,851	-83.7%	¥38M ($247K)

Frequently asked questions

Who has been buying Hakuyosha Company, Ltd. stock?: 6 distinct investors have filed 4 disclosed large-shareholding filings in Hakuyosha Company, Ltd. (9731), most recently on 2026-03-23. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does Hakuyosha Company, Ltd. have?: Hakuyosha Company, Ltd. has 4 buy-side and 6 sell-side disclosures on record, covering ¥1.2B ($7.6M) in total reported value, spanning 2021-12-07 to 2026-03-23.
Do insider buys in Japanese stocks predict returns?: Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.