Who has been buying Showa Sangyo Co., Ltd. stock?

8 distinct investors have filed 3 disclosed large-shareholding filings in Showa Sangyo Co., Ltd. (2004), most recently on 2025-12-22. 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 Showa Sangyo Co., Ltd. have?

Showa Sangyo Co., Ltd. has 3 buy-side and 7 sell-side disclosures on record, covering ¥2.5B ($16.3M) in total reported value, spanning 2021-06-03 to 2025-12-22.

Where does StockDrifts get Showa Sangyo 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.

Showa Sangyo Co., Ltd. 2004

Company

昭和産業株式会社Showa Sangyo Co., Ltd.

Investors

Buys

Total Value

¥2.5B ($16.3M)

Avg Return

+9.32%

Last Filing

2025-12-22

Showa Sangyo Co., Ltd. (2004) has 3 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥2.5B ($16.3M) in reported transaction value. The earliest filing StockDrifts holds for Showa Sangyo Co., Ltd. is dated 2021-06-03; the most recent is 2025-12-22. 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 +9.32%, 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
2025-12-22	BUY	unknown	アセットマネジメントOne株式会社	other	335.3K	¥2,868	+10.7%	¥1.1B ($6.9M)
2025-12-22	BUY	unknown	みずほ証券株式会社	other	41.8K	¥2,868	+10.7%	¥133M ($856K)
2025-12-22	SELL	unknown	株式会社みずほ銀行	strategic	900.0K	¥2,868	-10.7%	¥2.9B ($18.4M)
2025-12-15	SELL	unknown	伊藤忠商事株式会社 ITOCHU Corporation	strategic	2.3M	¥2,854	-11.3%	¥716M ($4.6M)
2025-11-10	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	328.9K	¥2,941	-8.0%	¥660M ($4.3M)
2025-11-10	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	40.2K	¥2,941	+8.0%	¥118M ($763K)
2025-11-10	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	1.5M	¥2,941	-8.0%	¥116M ($751K)
2021-06-18	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	10.4K	¥2,980	+6.5%	¥1.5B ($9.4M)
2021-06-18	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	845.4K	¥2,980	+6.5%	¥2.5B ($16.3M)
2021-06-18	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥2,980	+6.5%	-
2021-06-18	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	249.6K	¥2,980	-6.5%	¥403M ($2.6M)
2021-06-03	SELL	subscription	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	842.5K	¥2,974	-6.8%	¥69M ($443K)
2021-06-03	BUY	subscription	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥2,974	+6.8%	-
2021-06-03	BUY	subscription	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	392.9K	¥2,974	+6.8%	¥1.2B ($7.5M)
2021-06-03	SELL	subscription	野村證券株式会社 Nomura Securities Co.,Ltd.	other	506.6K	¥2,974	-6.8%	¥618M ($4.0M)

Frequently asked questions

Who has been buying Showa Sangyo Co., Ltd. stock?: 8 distinct investors have filed 3 disclosed large-shareholding filings in Showa Sangyo Co., Ltd. (2004), most recently on 2025-12-22. 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 Showa Sangyo Co., Ltd. have?: Showa Sangyo Co., Ltd. has 3 buy-side and 7 sell-side disclosures on record, covering ¥2.5B ($16.3M) in total reported value, spanning 2021-06-03 to 2025-12-22.
Where does StockDrifts get Showa Sangyo 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 Showa Sangyo Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.