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Ishihara Sangyo Kaisha,Ltd. 4028

Company
石原産業株式会社Ishihara Sangyo Kaisha,Ltd.
Investors
6
Buys
8
Total Value
¥9.3B ($60.0M)
Avg Return
+99.23%
Last Filing
2025-05-13

Ishihara Sangyo Kaisha,Ltd. (4028) has 8 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥9.3B ($60.0M) in reported transaction value. The earliest filing StockDrifts holds for Ishihara Sangyo Kaisha,Ltd. is dated 2022-09-22; the most recent is 2025-05-13. 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 +99.23%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-05-13SELLunknown
村上貴輝
Takateru Murakami
activist1.4M¥1,761-58.3%¥284M ($1.8M)
2025-05-13SELLunknown
株式会社MI2
MI2 Ltd.
activist160.6K¥1,761-58.3%¥498M ($3.2M)
2024-04-19BUYMarket Buy
野村アセットマネジメント株式会社
Nomura Asset Management Co., Ltd.
other1.5M¥1,773+57.3%¥2.6B ($16.6M)
2024-04-19BUYMarket Buy
ノムラ インターナショナル ピーエルシー
NOMURA INTERNATIONAL PLC
other291.9K¥1,773+57.3%¥93M ($601K)
2024-03-26BUYunknown
株式会社MI2
MI2 Ltd.
activist445.0K¥1,699+64.1%¥756M ($4.9M)
2024-03-26BUYunknown
村上貴輝
Takateru Murakami
activist1.6M¥1,699+64.1%¥2.7B ($17.5M)
2023-08-03BUYunknown
野村アセットマネジメント株式会社
Nomura Asset Management Co., Ltd.
other1.9M¥1,329+109.8%¥2.5B ($16.1M)
2023-08-03BUYunknown
ノムラ インターナショナル ピーエルシー
NOMURA INTERNATIONAL PLC
other238.0K¥1,329+109.8%¥316M ($2.0M)
2023-07-21SELLunknown
日興アセットマネジメント株式会社
Nikko Asset Management Co.,Ltd.
other506.8K¥1,323-110.7%¥171M ($1.1M)
2023-07-21SELLunknown
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.
other1.2M¥1,323-110.7%¥363M ($2.3M)
2022-09-22BUYunknown
日興アセットマネジメント株式会社
Nikko Asset Management Co.,Ltd.
other635.3K¥1,049+165.8%¥666M ($4.3M)
2022-09-22BUYunknown
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.
other1.4M¥1,049+165.8%¥1.5B ($9.8M)

Frequently asked questions

Who has been buying Ishihara Sangyo Kaisha,Ltd. stock?
6 distinct investors have filed 8 disclosed large-shareholding filings in Ishihara Sangyo Kaisha,Ltd. (4028), most recently on 2025-05-13. 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 Ishihara Sangyo Kaisha,Ltd. have?
Ishihara Sangyo Kaisha,Ltd. has 8 buy-side and 4 sell-side disclosures on record, covering ¥9.3B ($60.0M) in total reported value, spanning 2022-09-22 to 2025-05-13.
Where does StockDrifts get Ishihara Sangyo Kaisha,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 Ishihara Sangyo Kaisha,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.