Who has been buying Ishihara Chemical Co., Ltd. stock?

5 distinct investors have filed 11 disclosed large-shareholding filings in Ishihara Chemical Co., Ltd. (4462), most recently on 2025-10-22. 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 Chemical Co., Ltd. have?

Ishihara Chemical Co., Ltd. has 11 buy-side and 7 sell-side disclosures on record, covering ¥3.1B ($19.7M) in total reported value, spanning 2021-03-22 to 2025-10-22.

Where does StockDrifts get Ishihara Chemical 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.

Ishihara Chemical Co., Ltd. 4462

Company

石原ケミカル株式会社Ishihara Chemical Co., Ltd.

Investors

Buys

Total Value

¥3.1B ($19.7M)

Avg Return

+62.05%

Last Filing

2025-10-22

Ishihara Chemical Co., Ltd. (4462) has 11 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥3.1B ($19.7M) in reported transaction value. The earliest filing StockDrifts holds for Ishihara Chemical Co., Ltd. is dated 2021-03-22; the most recent is 2025-10-22. 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 +62.05%, 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
2026-05-26	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	1.6M	¥2,713	+37.5%	¥423M ($2.7M)
2025-10-22	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	1.5M	¥2,053	+25.5%	¥311M ($2.0M)
2025-07-07	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	1.3M	¥1,920	+34.2%	¥311M ($2.0M)
2024-10-07	SELL	unknown	ニッポン・アクティブ・バリュー・ファンド (NIPPON ACTIVE VALUE FUND PLC) NIPPON ACTIVE VALUE FUND PLC	activist	200.7K	¥2,435	-5.8%	¥1.4B ($9.3M)
2024-03-25	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	109.6K	¥1,885	+36.7%	¥207M ($1.3M)
2024-03-25	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	693.2K	¥1,885	+36.7%	¥1.3B ($8.4M)
2023-10-20	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	693.2K	¥1,599	+61.1%	¥1.1B ($7.2M)
2023-10-20	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	10.2K	¥1,599	-61.1%	¥360M ($2.3M)
2023-09-25	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	693.2K	¥1,633	+57.8%	¥1.1B ($7.3M)
2023-09-25	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	234.3K	¥1,633	+57.8%	¥383M ($2.5M)
2023-09-21	BUY	unknown	ニッポン・アクティブ・バリュー・ファンド (NIPPON ACTIVE VALUE FUND PLC) NIPPON ACTIVE VALUE FUND PLC	activist	826.5K	¥1,659	+55.3%	¥1.4B ($8.8M)
2023-04-21	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	693.2K	¥1,494	+72.4%	¥1.0B ($6.7M)
2023-04-21	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	58.0K	¥1,494	-72.4%	¥283M ($1.8M)
2022-02-07	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	693.2K	¥1,322	+94.9%	¥916M ($5.9M)
2022-02-07	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	247.1K	¥1,322	+94.9%	¥327M ($2.1M)
2021-10-22	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	693.2K	¥1,428	+80.4%	¥990M ($6.4M)
2021-10-22	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	15.0K	¥1,428	-80.4%	¥459M ($3.0M)
2021-08-20	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	346.6K	¥1,324	+94.6%	¥459M ($3.0M)
2021-08-20	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	168.3K	¥1,324	+94.6%	¥223M ($1.4M)
2021-05-12	SELL	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	200	¥1,042.5	-147.1%	¥10M ($66K)
2021-05-12	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	8.3K	¥1,042.5	-147.1%	¥158M ($1.0M)
2021-05-12	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	346.6K	¥1,042.5	+147.1%	¥361M ($2.3M)
2021-03-22	SELL	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	9.4K	¥1,041.36	-147.4%	¥65M ($416K)
2021-03-22	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	346.6K	¥1,041.36	+147.4%	¥361M ($2.3M)
2021-03-22	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	159.6K	¥1,041.36	+147.4%	¥166M ($1.1M)

Frequently asked questions

Who has been buying Ishihara Chemical Co., Ltd. stock?: 5 distinct investors have filed 11 disclosed large-shareholding filings in Ishihara Chemical Co., Ltd. (4462), most recently on 2025-10-22. 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 Chemical Co., Ltd. have?: Ishihara Chemical Co., Ltd. has 11 buy-side and 7 sell-side disclosures on record, covering ¥3.1B ($19.7M) in total reported value, spanning 2021-03-22 to 2025-10-22.
Where does StockDrifts get Ishihara Chemical 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 Ishihara Chemical Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.