Who has been buying Asahi Diamond Industrial Co., Ltd. stock?

11 distinct investors have filed 19 disclosed large-shareholding filings in Asahi Diamond Industrial Co., Ltd. (6140), most recently on 2024-09-17. 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 Asahi Diamond Industrial Co., Ltd. have?

Asahi Diamond Industrial Co., Ltd. has 19 buy-side and 7 sell-side disclosures on record, covering ¥10.3B ($66.3M) in total reported value, spanning 2021-10-21 to 2024-09-17.

Where does StockDrifts get Asahi Diamond Industrial 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.

Asahi Diamond Industrial Co., Ltd. 6140

Company

旭ダイヤモンド工業株式会社Asahi Diamond Industrial Co., Ltd.

Investors

Buys

Total Value

¥10.3B ($66.3M)

Avg Return

+80.29%

Last Filing

2024-09-17

Asahi Diamond Industrial Co., Ltd. (6140) has 19 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥10.3B ($66.3M) in reported transaction value. The earliest filing StockDrifts holds for Asahi Diamond Industrial Co., Ltd. is dated 2021-10-21; the most recent is 2024-09-17. 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 +80.29%, 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
2026-07-21	SELL	Market Buy	三菱UFJアセットマネジメント株式会社	passive	483.4K	¥1,136	-13.7%	¥171M ($1.1M)
2026-07-21	SELL	Market Buy	三菱UFJ信託銀行株式会社	passive	1.5M	¥1,136	-13.7%	¥396M ($2.6M)
2024-09-17	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	680.6K	¥832	+57.7%	¥566M ($3.7M)
2024-09-17	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.0M	¥832	+57.7%	¥1.6B ($10.5M)
2024-02-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.9M	¥881	+48.9%	¥1.7B ($10.9M)
2024-02-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	168.6K	¥881	-48.9%	¥37M ($236K)
2023-06-19	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	36.4K	¥811	-61.8%	¥35M ($226K)
2023-06-19	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	531.6K	¥811	+61.8%	¥31M ($197K)
2023-06-19	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.7M	¥811	+61.8%	¥9M ($56K)
2023-06-19	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	230.6K	¥811	-61.8%	¥900M ($5.8M)
2023-05-23	BUY	unknown	村上貴輝 Takateru Murakami	activist	2.1M	¥886	+48.1%	¥1.8B ($11.7M)
2023-05-23	SELL	unknown	株式会社MI2 MI2 Ltd.	unknown	0	¥886	-48.1%	¥86M ($554K)
2023-04-06	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	1.6M	¥865	-51.7%	¥513M ($3.3M)
2023-04-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.0M	¥865	+51.7%	¥140M ($902K)
2023-03-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	214.5K	¥881	+48.9%	¥189M ($1.2M)
2023-03-07	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	2.5M	¥881	+48.9%	¥2.2B ($14.4M)
2023-02-22	BUY	unknown	村上貴輝 Takateru Murakami	activist	2.6M	¥772	+70.0%	¥2.0B ($13.1M)
2023-02-22	BUY	unknown	株式会社MI2 MI2 Ltd.	activist	96.4K	¥772	+70.0%	¥74M ($480K)
2022-07-19	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	82.0K	¥619	+112.0%	¥51M ($327K)
2022-07-19	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	514.5K	¥619	+112.0%	¥100M ($645K)
2022-07-19	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.7M	¥619	+112.0%	¥255M ($1.6M)
2022-07-19	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.4M	¥619	+112.0%	¥857M ($5.5M)
2022-06-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	882.3K	¥608	+115.8%	¥17M ($109K)
2022-06-06	BUY	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	2.3M	¥608	+115.8%	¥254M ($1.6M)
2022-06-06	SELL	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	unknown	0	¥608	-115.8%	¥386M ($2.5M)
2022-03-04	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	850.3K	¥580	+126.2%	¥65M ($417K)
2022-03-04	BUY	negotiated	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	1.9M	¥580	+126.2%	¥23M ($146K)
2022-03-04	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	635.0K	¥580	-126.2%	¥368M ($2.4M)
2021-10-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	740.8K	¥669	+96.1%	¥145M ($938K)
2021-10-21	BUY	negotiated	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	1.8M	¥669	+96.1%	¥432M ($2.8M)
2021-10-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.3M	¥669	+96.1%	¥850M ($5.5M)

Frequently asked questions

Who has been buying Asahi Diamond Industrial Co., Ltd. stock?: 11 distinct investors have filed 19 disclosed large-shareholding filings in Asahi Diamond Industrial Co., Ltd. (6140), most recently on 2024-09-17. 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 Asahi Diamond Industrial Co., Ltd. have?: Asahi Diamond Industrial Co., Ltd. has 19 buy-side and 7 sell-side disclosures on record, covering ¥10.3B ($66.3M) in total reported value, spanning 2021-10-21 to 2024-09-17.
Where does StockDrifts get Asahi Diamond Industrial 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 Asahi Diamond Industrial Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.