Who has been buying Bookoff Group Holdings Limited stock?

7 distinct investors have filed 1 disclosed large-shareholding filings in Bookoff Group Holdings Limited (9278), most recently on 2026-03-04. 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 Bookoff Group Holdings Limited have?

Bookoff Group Holdings Limited has 1 buy-side and 4 sell-side disclosures on record, covering ¥918M ($5.9M) in total reported value, spanning 2021-06-04 to 2026-03-04.

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.

Bookoff Group Holdings Limited 9278

Company

ブックオフホールディングス株式会社Bookoff Group Holdings Limited

Investors

Buys

Total Value

¥918M ($5.9M)

Avg Return

+43.56%

Last Filing

2026-03-04

Bookoff Group Holdings Limited (9278) has 1 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥918M ($5.9M) in reported transaction value. The earliest filing StockDrifts holds for Bookoff Group Holdings Limited is dated 2021-06-04; the most recent is 2026-03-04. Across these filings the average return since disclosure is +43.56%, 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
2026-03-04	BUY	unknown	株式会社小学館	strategic	540.3K	¥1,783	-	¥963M ($6.2M)
2026-03-04	BUY	unknown	株式会社集英社	strategic	540.3K	¥1,783	-	¥963M ($6.2M)
2026-03-04	SELL	unknown	株式会社小学館	strategic	540.3K	¥1,783	-53.2%	¥524M ($3.4M)
2026-03-04	SELL	unknown	株式会社集英社	strategic	540.3K	¥1,783	-53.2%	¥524M ($3.4M)
2025-03-28	SELL	unknown	大日本印刷株式会社 Dai Nippon Printing Co.,Ltd.	other	0	¥1,529	-78.7%	¥2.0B ($12.6M)
2025-03-28	BUY	unknown	丸善雄松堂株式会社 Maruzen Yushodo Co., Ltd.	other	612.0K	¥1,529	+78.7%	¥918M ($5.9M)
2025-03-28	SELL	unknown	株式会社図書館流通センター TRC Library Service Inc.	other	375.0K	¥1,529	-78.7%	¥572M ($3.7M)
2023-11-08	BUY	unknown	株式会社講談社 Kodansha Co., Ltd.	other	833.3K	¥1,033	-	-
2023-11-08	BUY	unknown	株式会社小学館 Shogakukan,Inc	other	833.3K	¥1,033	-	-
2023-11-08	BUY	unknown	株式会社集英社 Shueisha Co., Ltd.	other	833.3K	¥1,033	-	-
2023-11-08	BUY	unknown	株式会社図書館流通センター TRC Library Service Inc.	other	750.0K	¥1,033	-	-
2023-11-08	BUY	unknown	丸善雄松堂株式会社 Maruzen Yushodo Co., Ltd.	other	1.2M	¥1,033	-	-
2023-11-08	BUY	unknown	大日本印刷株式会社 Dai Nippon Printing Co.,Ltd.	other	1.3M	¥1,033	-	-
2022-04-25	BUY	Market Buy	株式会社ハードオフコーポレーション HARD OFF CORPORATION Co.,Ltd.	passive	1.4M	¥1,006	-	-
2022-04-22	BUY	unknown	株式会社講談社 Kodansha Co., Ltd.	other	833.3K	¥1,050	-	-
2022-04-22	BUY	unknown	大日本印刷株式会社 Dai Nippon Printing Co.,Ltd.	other	1.3M	¥1,050	-	-
2022-04-22	BUY	unknown	丸善雄松堂株式会社 Maruzen Yushodo Co., Ltd.	other	1.2M	¥1,050	-	-
2022-04-22	BUY	unknown	株式会社図書館流通センター TRC Library Service Inc.	other	750.0K	¥1,050	-	-
2022-04-22	BUY	unknown	株式会社集英社 Shueisha Co., Ltd.	other	833.3K	¥1,050	-	-
2022-04-22	BUY	unknown	株式会社小学館 Shogakukan,Inc	other	833.3K	¥1,050	-	-
2021-06-04	BUY	unknown	大日本印刷株式会社 Dai Nippon Printing Co.,Ltd.	other	1.3M	¥922	-	-
2021-06-04	BUY	unknown	丸善雄松堂株式会社 Maruzen Yushodo Co., Ltd.	other	1.2M	¥922	-	-
2021-06-04	BUY	unknown	株式会社図書館流通センター TRC Library Service Inc.	other	750.0K	¥922	-	-
2021-06-04	BUY	unknown	株式会社講談社 Kodansha Co., Ltd.	other	833.3K	¥922	-	-
2021-06-04	BUY	unknown	株式会社集英社 Shueisha Co., Ltd.	other	833.3K	¥922	-	-
2021-06-04	BUY	unknown	株式会社小学館 Shogakukan,Inc	other	833.3K	¥922	-	-
2021-06-04	BUY	unknown	丸善雄松堂株式会社 Maruzen Yushodo Co., Ltd.	other	1.2M	¥922	-	-
2021-06-04	BUY	unknown	株式会社図書館流通センター TRC Library Service Inc.	other	750.0K	¥922	-	-
2021-06-04	BUY	unknown	株式会社講談社 Kodansha Co., Ltd.	other	833.3K	¥922	-	-
2021-06-04	BUY	unknown	株式会社集英社 Shueisha Co., Ltd.	other	833.3K	¥922	-	-
2021-06-04	BUY	unknown	株式会社小学館 Shogakukan,Inc	other	833.3K	¥922	-	-
2021-06-04	BUY	unknown	大日本印刷株式会社 Dai Nippon Printing Co.,Ltd.	other	1.3M	¥922	-	-

Frequently asked questions

Who has been buying Bookoff Group Holdings Limited stock?: 7 distinct investors have filed 1 disclosed large-shareholding filings in Bookoff Group Holdings Limited (9278), most recently on 2026-03-04. 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 Bookoff Group Holdings Limited have?: Bookoff Group Holdings Limited has 1 buy-side and 4 sell-side disclosures on record, covering ¥918M ($5.9M) in total reported value, spanning 2021-06-04 to 2026-03-04.
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.