Who has been buying Iwaki Co., Ltd. stock?

7 distinct investors have filed 12 disclosed large-shareholding filings in Iwaki Co., Ltd. (6237), most recently on 2025-10-06. 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 Iwaki Co., Ltd. have?

Iwaki Co., Ltd. has 12 buy-side and 6 sell-side disclosures on record, covering ¥2.7B ($17.3M) in total reported value, spanning 2021-06-11 to 2025-10-06.

Where does StockDrifts get Iwaki 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.

Iwaki Co., Ltd. 6237

Company

株式会社イワキIwaki Co., Ltd.

Investors

Buys

Total Value

¥2.7B ($17.3M)

Avg Return

+23.87%

Last Filing

2025-10-06

Iwaki Co., Ltd. (6237) has 12 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥2.7B ($17.3M) in reported transaction value. The earliest filing StockDrifts holds for Iwaki Co., Ltd. is dated 2021-06-11; the most recent is 2025-10-06. 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 +23.87%, 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
2026-08-05	BUY	Market Buy	Charon Finance GmbH	activist	3.8M	¥5,950	-22.1%	¥1.4B ($9.0M)
2026-07-21	BUY	Market Buy	Charon Finance GmbH	activist	3.6M	¥4,745	-2.3%	¥1.3B ($8.4M)
2026-07-01	BUY	Market Buy	Charon Finance GmbH	activist	3.3M	¥4,000	+28.8%	¥945M ($6.1M)
2026-06-26	BUY	Market Buy	ダルトン・インベストメンツ・インク(Dalton Investments, Inc.) Dalton Investments, Inc.	activist	1.5M	¥3,585	+39.2%	¥822M ($5.3M)
2025-10-06	BUY	Market Buy	Charon Finance GmbH	activist	3.1M	¥2,661	+0.4%	¥598M ($3.9M)
2025-05-26	BUY	Market Buy	Charon Finance GmbH	activist	2.8M	¥2,558	+4.4%	¥598M ($3.9M)
2024-11-11	BUY	Market Buy	Charon Finance GmbH	activist	2.6M	¥3,050	-12.4%	¥727M ($4.7M)
2024-08-19	BUY	Market Buy	Charon Finance GmbH	activist	2.4M	¥2,890	-7.6%	¥773M ($5.0M)
2024-08-01	BUY	Market Buy	Charon Finance GmbH	activist	2.1M	¥2,872	-7.0%	¥646M ($4.2M)
2024-04-30	BUY	Market Buy	Charon Finance GmbH	activist	1.9M	¥2,565	+4.1%	¥583M ($3.8M)
2024-03-22	BUY	Market Buy	Charon Finance GmbH	activist	1.7M	¥2,807	-4.8%	¥644M ($4.2M)
2024-02-16	BUY	Market Buy	Charon Finance GmbH	activist	1.4M	¥2,415	+10.6%	¥603M ($3.9M)
2024-02-16	BUY	unknown	Charon Finance GmbH	activist	1.4M	¥2,415	+10.6%	¥603M ($3.9M)
2024-02-08	BUY	negotiated	ダルトン・インベストメンツ・インク(Dalton Investments, Inc.) Dalton Investments, Inc.	activist	1.3M	¥2,343	+14.0%	¥3.0B ($19.0M)
2024-01-11	BUY	negotiated	ダルトン・インベストメンツ・インク(Dalton Investments Dalton Investments, Inc.	activist	1.3M	¥2,132	+25.3%	¥2.7B ($17.3M)
2024-01-11	SELL	negotiated	ダルトン・インベストメンツ・エルエルシー Dalton Investments LLC	activist	0	¥2,132	-25.3%	¥2.4B ($15.5M)
2023-11-16	BUY	negotiated	ダルトン・インベストメンツ・エルエルシー(Dalton Investments LLC) Dalton Investments LLC	activist	1.1M	¥1,842	+45.0%	¥2.1B ($13.4M)
2023-11-06	BUY	Market Buy	Charon Finance GmbH	activist	1.2M	¥1,927	+38.6%	¥95M ($615K)
2023-10-04	BUY	unknown	Charon Finance GmbH	activist	1.1M	¥1,769	+51.0%	¥2.0B ($12.8M)
2022-06-02	SELL	negotiated	ダルトン・インベストメンツ・エルエルシー(Dalton Investments LLC) Dalton Investments LLC	activist	892.5K	¥973	-174.5%	¥225M ($1.5M)
2022-05-27	BUY	unknown	株式会社藤中ホールディングス Fujinaka Holdings Co., Ltd.	activist	2.7M	¥975	+173.9%	¥2.6B ($17.0M)
2022-05-27	BUY	unknown	イワキ産業株式会社 Iwaki Sangyo Co., Ltd.	activist	856.8K	¥975	+173.9%	¥835M ($5.4M)
2022-05-27	SELL	unknown	藤中留美 Rumi Fujinaka	activist	1.7M	¥975	-173.9%	¥156M ($1.0M)
2022-05-27	BUY	unknown	株式会社藤中ホールディングス Fujinaka Holdings Co., Ltd.	activist	2.7M	¥975	+173.9%	¥2.6B ($17.0M)
2022-05-27	BUY	unknown	イワキ産業株式会社 Iwaki Sangyo Co., Ltd.	activist	856.8K	¥975	+173.9%	¥835M ($5.4M)
2022-05-27	SELL	unknown	藤中茂 Fujinaka Shigeru	activist	1.8M	¥975	-173.9%	¥136M ($877K)
2022-05-27	SELL	unknown	藤中茂 Fujinaka Shigeru	activist	1.8M	¥975	-173.9%	¥136M ($877K)
2022-05-27	SELL	unknown	藤中留美 Rumi Fujinaka	activist	1.7M	¥975	-173.9%	¥156M ($1.0M)
2021-06-11	BUY	negotiated	ダルトン・インベストメンツ・エルエルシー(Dalton Investments LLC) Dalton Investments LLC	activist	1.1M	¥1,011	+164.2%	¥1.1B ($7.3M)

Frequently asked questions

Who has been buying Iwaki Co., Ltd. stock?: 7 distinct investors have filed 12 disclosed large-shareholding filings in Iwaki Co., Ltd. (6237), most recently on 2025-10-06. 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 Iwaki Co., Ltd. have?: Iwaki Co., Ltd. has 12 buy-side and 6 sell-side disclosures on record, covering ¥2.7B ($17.3M) in total reported value, spanning 2021-06-11 to 2025-10-06.
Where does StockDrifts get Iwaki 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 Iwaki Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.