Who has been buying ITbook Holdings Co.,Ltd. stock?

8 distinct investors have filed 13 disclosed large-shareholding filings in ITbook Holdings Co.,Ltd. (1447), most recently on 2026-03-10. 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 ITbook Holdings Co.,Ltd. have?

ITbook Holdings Co.,Ltd. has 13 buy-side and 25 sell-side disclosures on record, covering ¥1.8B ($11.8M) in total reported value, spanning 2022-03-25 to 2026-03-10.

Where does StockDrifts get ITbook Holdings Co.,Ltd. insider data?

From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.

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.

ITbook Holdings Co.,Ltd. 1447

Company

SAAFホールディングス株式会社ITbook Holdings Co.,Ltd.

Investors

Buys

Total Value

¥1.8B ($11.8M)

Avg Return

-35.48%

Last Filing

2026-03-10

ITbook Holdings Co.,Ltd. (1447) has 13 disclosed large-shareholding filings and 25 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥1.8B ($11.8M) in reported transaction value. The earliest filing StockDrifts holds for ITbook Holdings Co.,Ltd. is dated 2022-03-25; the most recent is 2026-03-10. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). Across these filings the average return since disclosure is -35.48%, 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
2026-07-27	BUY	Market Buy	ミツワ樹脂工業株式会社取締役社長平野正浩 Mitsuwa resin industry Ltd.	passive	2.4M	¥369	+2.7%	¥274M ($1.8M)
2026-07-23	BUY	Market Buy	ミツワ樹脂工業株式会社取締役社長平野正浩 Mitsuwa resin industry Ltd.	passive	1.7M	¥355	+6.8%	¥167M ($1.1M)
2026-07-17	BUY	Market Buy	ミツワ樹脂工業株式会社取締役社長平野正浩 Mitsuwa resin industry Ltd.	passive	1.2M	¥405	-6.4%	¥499M ($3.2M)
2026-03-10	BUY	unknown	前俊守 Toshimori Mae	strategic	1.4M	¥364	-12.9%	¥516M ($3.3M)
2026-03-10	BUY	unknown	前俊守 Toshimori Mae	activist	1.4M	¥364	-12.9%	¥516M ($3.3M)
2026-03-10	BUY	unknown	前俊守 Toshimori Mae	strategic	1.4M	¥364	-12.9%	¥516M ($3.3M)
2026-03-10	BUY	unknown	前俊守 Toshimori Mae	activist	1.4M	¥364	-12.9%	¥516M ($3.3M)
2024-08-19	BUY	private	フレンドリー・パートナーズ株式会社 Friendly Partners Co., Ltd.	passive	1.8M	¥254	+24.8%	¥75M ($481K)
2024-08-19	BUY	private	フレンドリー・パートナーズ株式会社 Friendly Partners Co., Ltd.	passive	1.8M	¥254	+24.8%	¥75M ($481K)
2024-08-02	SELL	unknown	前俊守 Toshimori Mae	strategic	1.4M	¥254	-24.8%	¥4M ($24K)
2023-12-14	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	627.5K	¥253	-25.3%	¥17M ($110K)
2023-12-14	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	505.3K	¥253	-25.3%	¥82M ($532K)
2023-12-14	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	505.3K	¥253	-25.3%	¥82M ($532K)
2023-12-14	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	627.5K	¥253	-25.3%	¥17M ($110K)
2023-12-14	SELL	unknown	前俊守 Toshimori Mae	strategic	1.4M	¥253	-25.3%	¥17M ($110K)
2023-02-21	BUY	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥414	-23.4%	¥344M ($2.2M)
2023-02-21	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	254.8K	¥414	+23.4%	¥114M ($735K)
2023-02-21	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	0	¥414	+23.4%	¥105M ($677K)
2023-02-21	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥414	+23.4%	¥25M ($161K)
2023-02-21	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	254.8K	¥414	+23.4%	¥114M ($735K)
2023-02-21	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥414	+23.4%	¥21M ($135K)
2023-02-21	BUY	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥414	-23.4%	¥344M ($2.2M)
2023-02-21	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	0	¥414	+23.4%	¥105M ($677K)
2023-02-21	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥414	+23.4%	¥25M ($161K)
2023-02-21	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥414	+23.4%	¥21M ($135K)
2023-02-21	BUY	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥414	-23.4%	¥288M ($1.9M)
2023-02-21	BUY	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥414	-23.4%	¥288M ($1.9M)
2022-11-28	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥417	+24.0%	¥25M ($162K)
2022-11-28	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	529.8K	¥417	+24.0%	¥115M ($741K)
2022-11-28	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥417	+24.0%	¥25M ($162K)
2022-11-28	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	420.0K	¥417	+24.0%	¥160M ($1.0M)
2022-11-28	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥417	+24.0%	¥21M ($136K)
2022-11-28	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥417	+24.0%	¥21M ($136K)
2022-09-01	BUY	private	フレンドリー・パートナーズ株式会社 Friendly Partners Co., Ltd.	passive	1.5M	¥405	-21.7%	¥616M ($4.0M)
2022-08-30	BUY	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥415	-23.6%	¥344M ($2.2M)
2022-08-30	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	750.0K	¥415	+23.6%	¥108M ($699K)
2022-08-30	BUY	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥415	-23.6%	¥289M ($1.9M)
2022-08-29	SELL	unknown	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥432	+26.6%	¥972K ($6K)
2022-08-29	SELL	unknown	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	1.0M	¥432	+26.6%	¥76M ($489K)
2022-08-29	SELL	unknown	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	696.3K	¥432	+26.6%	¥39M ($251K)
2022-06-30	BUY	Market Buy	株式会社HATASE HOLDINGS 代表取締役畑瀬匡甫 HATASE HOLDINGS Co., Ltd. CEO Kyosuke Hatase	passive	1.1M	¥547	-42.0%	¥627M ($4.0M)
2022-06-23	BUY	Market Buy	株式会社HATASE HOLDINGS HATASE HOLDINGS Co., Ltd.	passive	1.2M	¥516	-38.6%	¥616M ($4.0M)
2022-06-02	SELL	Market Buy	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	829.9K	¥495	+36.0%	¥9M ($57K)
2022-06-02	BUY	Market Buy	株式会社NEW ART HOLDINGS NEW ART HOLDINGS Co., Ltd.	corporate	782.6K	¥495	-36.0%	¥109M ($701K)
2022-06-02	BUY	Market Buy	ニューアートインベストメントリミテッド New Art Investment Limited	corporate	1.2M	¥495	-36.0%	¥71M ($458K)
2022-04-06	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	14.8K	¥492	-35.6%	¥1M ($9K)
2022-04-06	BUY	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	24.9K	¥492	-35.6%	¥11M ($70K)
2022-04-05	BUY	unknown	前俊守 Toshimori Mae	strategic	1.4M	¥511	-38.0%	¥703M ($4.5M)
2022-04-05	BUY	unknown	前俊守 Toshimori Mae	strategic	1.4M	¥511	-38.0%	¥703M ($4.5M)
2022-03-30	BUY	Market Buy	株式会社ホワイトストーン Whitestone Co., Ltd.	corporate	815.0K	¥628	-49.5%	¥85M ($551K)

Showing the 50 most recent of 57 filings.

Frequently asked questions

Who has been buying ITbook Holdings Co.,Ltd. stock?: 8 distinct investors have filed 13 disclosed large-shareholding filings in ITbook Holdings Co.,Ltd. (1447), most recently on 2026-03-10. 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 ITbook Holdings Co.,Ltd. have?: ITbook Holdings Co.,Ltd. has 13 buy-side and 25 sell-side disclosures on record, covering ¥1.8B ($11.8M) in total reported value, spanning 2022-03-25 to 2026-03-10.
Where does StockDrifts get ITbook Holdings Co.,Ltd. insider data?: From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
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.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for ITbook Holdings Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.