Who has been buying Oriental Shiraishi Corporation stock?

11 distinct investors have filed 30 disclosed large-shareholding filings in Oriental Shiraishi Corporation (1786), most recently on 2026-04-06. 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 Oriental Shiraishi Corporation have?

Oriental Shiraishi Corporation has 30 buy-side and 9 sell-side disclosures on record, covering ¥12.5B ($80.9M) in total reported value, spanning 2021-04-21 to 2026-04-06.

Where does StockDrifts get Oriental Shiraishi Corporation 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.

Oriental Shiraishi Corporation 1786

Company

オリエンタル白石株式会社Oriental Shiraishi Corporation

Investors

Buys

Total Value

¥12.5B ($80.9M)

Avg Return

+15.18%

Last Filing

2026-04-06

Oriental Shiraishi Corporation (1786) has 30 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥12.5B ($80.9M) in reported transaction value. The earliest filing StockDrifts holds for Oriental Shiraishi Corporation is dated 2021-04-21; the most recent is 2026-04-06. 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 +15.18%, 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
2026-08-12	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	28.1M	¥347	+1.7%	¥511M ($3.3M)
2026-07-21	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	26.7M	¥360	-1.9%	¥530M ($3.4M)
2026-07-06	BUY	unknown	野村アセットマネジメント株式会社	other	5.2M	¥352	+2.8%	¥1.8B ($11.8M)
2026-07-06	BUY	unknown	野村證券株式会社	other	1.8M	¥352	+2.8%	¥626M ($4.0M)
2026-06-19	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	401.6K	¥334	+5.7%	¥134M ($865K)
2026-06-19	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	25.2M	¥334	+5.7%	¥501M ($3.2M)
2026-06-19	SELL	unknown	野村證券株式会社	other	-461	¥334	-	-
2026-06-19	SELL	unknown	野村アセットマネジメント株式会社	other	4.4M	¥334	-5.7%	¥385M ($2.5M)
2026-04-06	BUY	unknown	野村證券株式会社	other	1.5M	¥375	+0.5%	¥556M ($3.6M)
2026-04-06	BUY	unknown	野村アセットマネジメント株式会社	other	5.5M	¥375	+0.5%	¥2.1B ($13.4M)
2026-02-26	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	16.4M	¥418	-13.2%	¥580M ($3.7M)
2026-01-09	BUY	Market Buy	アセットマネジメントOne株式会社	other	8.3M	¥417	-12.9%	¥3.0B ($19.5M)
2026-01-09	SELL	Market Buy	みずほ証券株式会社	other	106.4K	¥417	+12.9%	¥39M ($249K)
2025-08-08	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	15.1M	¥405	-10.4%	¥613M ($4.0M)
2025-04-14	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	23.7M	¥369	-1.6%	¥553M ($3.6M)
2024-11-01	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	22.2M	¥378	-4.0%	¥572M ($3.7M)
2024-09-24	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	6.9M	¥396	-8.3%	¥2.7B ($17.7M)
2024-09-24	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	162.5K	¥396	-8.3%	¥64M ($415K)
2024-08-20	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	20.7M	¥363	+0.0%	¥524M ($3.4M)
2024-01-10	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥352	+3.1%	¥4.8B ($30.8M)
2023-11-01	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	19.2M	¥332	+9.3%	¥488M ($3.2M)
2023-10-05	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥314	+15.6%	¥4.3B ($27.5M)
2023-09-06	BUY	Market Buy	伊藤忠商事株式会社 ITOCHU Corporation	strategic	17.8M	¥331	+9.7%	¥482M ($3.1M)
2023-07-04	SELL	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥310	-17.1%	¥559M ($3.6M)
2023-06-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	2.8M	¥314	-15.6%	¥218M ($1.4M)
2023-06-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.8M	¥314	-15.6%	¥449M ($2.9M)
2023-06-05	BUY	unknown	伊藤忠商事株式会社 ITOCHU Corporation	strategic	16.3M	¥299	+21.4%	¥4.9B ($31.5M)
2023-05-02	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥331	+9.7%	¥4.5B ($28.9M)
2023-05-01	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥335	+8.4%	¥4.5B ($29.3M)
2023-04-10	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥322	+12.7%	¥4.4B ($28.2M)
2023-03-28	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥322	+12.7%	¥4.4B ($28.2M)
2023-03-27	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥318	+14.2%	¥4.3B ($27.8M)
2023-03-06	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	3.1M	¥321	+13.1%	¥90M ($583K)
2023-03-06	SELL	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	3.7M	¥321	-13.1%	¥413M ($2.7M)
2023-01-30	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥310	+17.1%	¥4.2B ($27.1M)
2023-01-12	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥288	+26.0%	¥3.9B ($25.2M)
2023-01-11	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥285	+27.4%	¥3.9B ($24.9M)
2022-12-07	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥273	+33.0%	¥3.7B ($23.9M)
2022-11-16	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥269	+34.9%	¥3.6B ($23.5M)
2022-11-15	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥266	+36.5%	¥3.6B ($23.3M)
2022-11-11	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥269	+34.9%	¥3.6B ($23.5M)
2022-11-10	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥272	+33.5%	¥3.7B ($23.8M)
2022-11-09	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥274	+32.5%	¥3.7B ($24.0M)
2022-11-09	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥274	+32.5%	¥3.7B ($24.0M)
2022-11-08	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥271	+34.0%	¥3.7B ($23.7M)
2022-11-07	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥271	+34.0%	¥3.7B ($23.7M)
2022-11-02	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥265	+37.0%	¥3.6B ($23.2M)
2022-10-26	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥267	+36.0%	¥3.6B ($23.3M)
2022-10-25	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥264	+37.5%	¥3.6B ($23.1M)
2022-10-18	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	13.6M	¥256	+41.8%	¥3.5B ($22.4M)

Showing the 50 most recent of 98 filings.

Frequently asked questions

Who has been buying Oriental Shiraishi Corporation stock?: 11 distinct investors have filed 30 disclosed large-shareholding filings in Oriental Shiraishi Corporation (1786), most recently on 2026-04-06. 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 Oriental Shiraishi Corporation have?: Oriental Shiraishi Corporation has 30 buy-side and 9 sell-side disclosures on record, covering ¥12.5B ($80.9M) in total reported value, spanning 2021-04-21 to 2026-04-06.
Where does StockDrifts get Oriental Shiraishi Corporation 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 Oriental Shiraishi Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.