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

7 distinct investors have filed 11 disclosed large-shareholding filings in Atomix Co.,Ltd. (4625), most recently on 2025-03-21. 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 Atomix Co.,Ltd. have?

Atomix Co.,Ltd. has 11 buy-side and 5 sell-side disclosures on record, covering ¥446M ($2.9M) in total reported value, spanning 2021-03-25 to 2025-03-21.

Where does StockDrifts get Atomix 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.

Atomix Co.,Ltd. 4625

Company

アトミクス株式会社Atomix Co.,Ltd.

Investors

Buys

Total Value

¥446M ($2.9M)

Avg Return

+24.48%

Last Filing

2025-03-21

Atomix Co.,Ltd. (4625) has 11 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥446M ($2.9M) in reported transaction value. The earliest filing StockDrifts holds for Atomix Co.,Ltd. is dated 2021-03-25; the most recent is 2025-03-21. 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 +24.48%, 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
2026-07-15	BUY	Market Buy	アトミクス取引先持株会理事長楠本慶太 Keita Kusumoto	strategic	1.0M	¥750	+5.2%	¥58M ($375K)
2026-07-15	BUY	unknown	アトミクス取引先持株会理事長楠本慶太 Keita Kusumoto	strategic	1.0M	¥750	+5.2%	¥58M ($375K)
2025-03-21	BUY	unknown	三宅秀夫 Hideo Miyake	other	404.3K	¥624	+29.8%	¥252M ($1.6M)
2023-12-15	BUY	unknown	アトミクス取引先持株会理事長楠本慶太 Keita Kusumoto	strategic	961.9K	¥646	+25.4%	¥48M ($311K)
2023-12-15	BUY	Market Buy	アトミクス取引先持株会理事長楠本慶太 Keita Kusumoto	strategic	961.9K	¥646	+25.4%	¥48M ($311K)
2022-06-10	SELL	unknown	アトミクス取引先持株会理事長大井明朗 Akio Ooi	strategic	0	¥651	-24.4%	¥552M ($3.6M)
2022-06-10	BUY	unknown	アトミクス取引先持株会理事長楠本慶太 Keita Kusumoto	strategic	887.4K	¥651	+24.4%	¥578M ($3.7M)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.1M	¥652	+24.2%	¥708M ($4.6M)
2022-04-12	BUY	Market Buy	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.2M	¥652	+24.2%	¥63M ($409K)
2022-04-12	BUY	Market Buy	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.3M	¥652	+24.2%	¥64M ($413K)
2022-04-12	SELL	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.2M	¥652	-24.2%	¥85M ($548K)
2022-04-12	SELL	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	790.0K	¥652	-24.2%	¥236M ($1.5M)
2022-04-12	BUY	Market Buy	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	793.0K	¥652	+24.2%	¥122M ($789K)
2022-04-12	BUY	Market Buy	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	866.5K	¥652	+24.2%	¥48M ($308K)
2022-04-12	BUY	Market Buy	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	957.9K	¥652	+24.2%	¥59M ($384K)
2022-04-12	SELL	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	774.2K	¥652	-24.2%	¥119M ($771K)
2022-04-12	BUY	Market Buy	アトミクス持株会理事長大井明朗 AKIO OOI	strategic	848.0K	¥652	+24.2%	¥48M ($308K)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.1M	¥652	+24.2%	¥708M ($4.6M)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.3M	¥652	+24.2%	¥64M ($413K)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	1.2M	¥652	+24.2%	¥85M ($548K)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	790.0K	¥652	+24.2%	¥235M ($1.5M)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	793.0K	¥652	+24.2%	¥122M ($786K)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	866.5K	¥652	+24.2%	¥48M ($308K)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	957.9K	¥652	+24.2%	¥60M ($387K)
2022-04-12	BUY	unknown	アトミクス取引先持株会理事長大井明朗 AKIO OOI	strategic	774.2K	¥652	+24.2%	¥120M ($774K)
2022-04-12	BUY	unknown	アトミクス持株会理事長大井明朗 AKIO OOI	strategic	848.0K	¥652	+24.2%	¥48M ($311K)
2021-05-18	BUY	Market Buy	東京中小企業投資育成株式会社 Tokyo Small and Medium Business Investment&Consultation CO.,LTD.	passive	700.0K	¥675	+20.0%	¥83M ($533K)
2021-05-18	BUY	Market Buy	東京中小企業投資育成株式会社 Tokyo Small and Medium Business Investment&Consultation CO.,LTD.	passive	700.0K	¥675	+20.0%	¥83M ($536K)
2021-03-25	BUY	unknown	西川正洋 Masahiro Nishikawa	unknown	280.5K	¥616.384	+31.4%	¥173M ($1.1M)
2021-03-25	SELL	unknown	西川不動産株式会社 Nishikawa Real Estate Co., Ltd.	strategic	0	¥616.384	-31.4%	¥6M ($39K)
2021-03-25	BUY	unknown	西川正洋 Masahiro Nishikawa	strategic	280.5K	¥616.384	+31.4%	¥173M ($1.1M)

Frequently asked questions

Who has been buying Atomix Co.,Ltd. stock?: 7 distinct investors have filed 11 disclosed large-shareholding filings in Atomix Co.,Ltd. (4625), most recently on 2025-03-21. 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 Atomix Co.,Ltd. have?: Atomix Co.,Ltd. has 11 buy-side and 5 sell-side disclosures on record, covering ¥446M ($2.9M) in total reported value, spanning 2021-03-25 to 2025-03-21.
Where does StockDrifts get Atomix 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 Atomix Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.