Who has been buying Kato Works Co.,Ltd. stock?

10 distinct investors have filed 5 disclosed large-shareholding filings in Kato Works Co.,Ltd. (6390), most recently on 2025-11-20. 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 Kato Works Co.,Ltd. have?

Kato Works Co.,Ltd. has 5 buy-side and 8 sell-side disclosures on record, covering ¥561M ($3.6M) in total reported value, spanning 2021-03-17 to 2025-11-20.

Where does StockDrifts get Kato Works 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.

Kato Works Co.,Ltd. 6390

Company

株式会社加藤製作所Kato Works Co.,Ltd.

Investors

Buys

Total Value

¥561M ($3.6M)

Avg Return

+64.73%

Last Filing

2025-11-20

Kato Works Co.,Ltd. (6390) has 5 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥561M ($3.6M) in reported transaction value. The earliest filing StockDrifts holds for Kato Works Co.,Ltd. is dated 2021-03-17; the most recent is 2025-11-20. 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 +64.73%, 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
2025-11-20	SELL	Market Buy	第一生命保険株式会社 The Dai-ichi Life Insurance Company, Limited	passive	489.4K	¥1,213	-19.0%	¥198M ($1.3M)
2024-05-08	SELL	negotiated	りそなアセットマネジメント株式会社 Resona Asset Management Co., Ltd.	other	58.2K	¥1,359	-6.2%	¥161M ($1.0M)
2024-05-08	BUY	negotiated	株式会社りそな銀行 Resona Bank, Limited.	strategic	573.3K	¥1,359	+6.2%	¥779M ($5.0M)
2023-11-01	SELL	unknown	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	unknown	0	¥1,199	-20.4%	¥708M ($4.6M)
2023-09-25	SELL	Market Buy	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	passive	591.0K	¥1,261	-14.4%	¥397M ($2.6M)
2023-09-01	SELL	Market Buy	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	passive	905.6K	¥1,322	-9.2%	¥144M ($932K)
2022-03-08	BUY	Market Buy	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	activist	1.0M	¥758	+90.4%	¥93M ($603K)
2022-01-31	BUY	Market Buy	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	activist	891.4K	¥820	+76.0%	¥105M ($677K)
2021-09-17	BUY	Market Buy	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	activist	762.9K	¥918	+57.2%	¥116M ($751K)
2021-09-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	264.7K	¥926	+55.8%	¥11M ($70K)
2021-09-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	49.0K	¥926	+55.8%	¥45M ($293K)
2021-09-07	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	129.7K	¥926	-55.8%	¥156M ($1.0M)
2021-08-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	463.1K	¥1,000	+44.3%	¥457M ($2.9M)
2021-08-06	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	11.5K	¥1,000	-44.3%	¥23M ($152K)
2021-04-21	BUY	Market Buy	タワー投資顧問株式会社 Tower Investment Management Co., Ltd.	activist	636.8K	¥1,045	+38.1%	¥665M ($4.3M)
2021-03-17	SELL	unknown	日本バリュー・インベスターズ株式会社 Nippon Value Investors KK	other	266.8K	¥964.123	-49.7%	¥324M ($2.1M)

Frequently asked questions

Who has been buying Kato Works Co.,Ltd. stock?: 10 distinct investors have filed 5 disclosed large-shareholding filings in Kato Works Co.,Ltd. (6390), most recently on 2025-11-20. 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 Kato Works Co.,Ltd. have?: Kato Works Co.,Ltd. has 5 buy-side and 8 sell-side disclosures on record, covering ¥561M ($3.6M) in total reported value, spanning 2021-03-17 to 2025-11-20.
Where does StockDrifts get Kato Works 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 Kato Works Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.