Who has been buying Seiwa Chuo Holdings Corporation stock?

12 distinct investors have filed 6 disclosed large-shareholding filings in Seiwa Chuo Holdings Corporation (7531), most recently on 2026-05-08. 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 Seiwa Chuo Holdings Corporation have?

Seiwa Chuo Holdings Corporation has 6 buy-side and 6 sell-side disclosures on record, covering ¥3.4B ($22.1M) in total reported value, spanning 2021-12-07 to 2026-05-08.

Where does StockDrifts get Seiwa Chuo Holdings Corporation 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.

Seiwa Chuo Holdings Corporation 7531

Company

清和中央ホールディングス株式会社Seiwa Chuo Holdings Corporation

Investors

Buys

Total Value

¥3.4B ($22.1M)

Avg Return

-6.89%

Last Filing

2026-05-08

Seiwa Chuo Holdings Corporation (7531) has 6 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥3.4B ($22.1M) in reported transaction value. The earliest filing StockDrifts holds for Seiwa Chuo Holdings Corporation is dated 2021-12-07; the most recent is 2026-05-08. 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 -6.89%, 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
2026-06-03	BUY	negotiated	エスケー興産株式会社 SK Kosan Co., Ltd.	activist	575.8K	¥1,350	-4.4%	¥777M ($5.0M)
2026-05-08	BUY	Market Buy	阪上正章	activist	473.6K	¥1,471	-8.2%	¥57M ($371K)
2026-05-08	BUY	negotiated	エスケー興産株式会社	activist	575.8K	¥1,471	-8.2%	¥847M ($5.5M)
2026-05-08	BUY	Market Buy	阪上正章	activist	473.6K	¥1,471	-8.2%	¥57M ($371K)
2026-05-08	BUY	negotiated	エスケー興産株式会社	activist	575.8K	¥1,471	-8.2%	¥847M ($5.5M)
2026-03-12	BUY	Market Buy	東洋商事株式会社	unknown	149.5K	¥1,460	-1.4%	¥221M ($1.4M)
2026-03-12	BUY	Market Buy	西神製罐株式会社	unknown	200	¥1,460	-1.4%	¥296K ($2K)
2026-03-12	BUY	Market Buy	光洋機械産業株式会社	unknown	200	¥1,460	-1.4%	¥296K ($2K)
2026-03-12	BUY	Market Buy	大和製罐株式会社	unknown	377.8K	¥1,460	-1.4%	¥559M ($3.6M)
2026-03-12	BUY	Market Buy	山口興産株式会社	unknown	31.3K	¥1,460	-1.4%	¥46M ($299K)
2026-03-12	SELL	Market Buy	山口久一	passive	0	¥1,460	-1.4%	-
2026-03-12	BUY	Market Buy	株式会社ワイエムピー	passive	711.8K	¥1,460	+1.4%	¥1.1B ($6.8M)
2026-03-10	BUY	Market Buy	株式会社ワイエムピー	passive	662.2K	¥1,460	+1.4%	¥980M ($6.3M)
2026-03-10	BUY	Market Buy	山口興産株式会社	unknown	31.3K	¥1,460	-1.4%	¥46M ($299K)
2026-03-10	BUY	Market Buy	山口久一	unknown	14.1K	¥1,460	-1.4%	¥21M ($135K)
2026-03-10	SELL	Market Buy	山口裕久	passive	0	¥1,460	-1.4%	-
2026-03-10	BUY	Market Buy	西神製罐株式会社	unknown	200	¥1,460	-1.4%	¥296K ($2K)
2026-03-10	BUY	Market Buy	光洋機械産業株式会社	unknown	200	¥1,460	-1.4%	¥296K ($2K)
2026-03-10	BUY	Market Buy	大和製罐株式会社	unknown	377.8K	¥1,460	-1.4%	¥559M ($3.6M)
2026-03-10	BUY	Market Buy	東洋商事株式会社	unknown	149.5K	¥1,460	-1.4%	¥221M ($1.4M)
2026-01-05	BUY	Market Buy	東洋商事株式会社	unknown	149.5K	¥1,488	+0.5%	¥221M ($1.4M)
2026-01-05	BUY	Market Buy	西神製罐株式会社	unknown	200	¥1,488	+0.5%	¥296K ($2K)
2026-01-05	BUY	Market Buy	光洋機械産業株式会社	unknown	200	¥1,488	+0.5%	¥296K ($2K)
2026-01-05	BUY	Market Buy	大和製罐株式会社	unknown	377.8K	¥1,488	+0.5%	¥559M ($3.6M)
2026-01-05	BUY	Market Buy	山口興産株式会社	unknown	31.3K	¥1,488	+0.5%	¥46M ($299K)
2026-01-05	BUY	Market Buy	山口裕久	unknown	8.1K	¥1,488	+0.5%	¥12M ($77K)
2026-01-05	BUY	Market Buy	山口久一	unknown	14.1K	¥1,488	+0.5%	¥21M ($135K)
2026-01-05	SELL	Market Buy	山口久一	passive	14.1K	¥1,488	+0.5%	¥21M ($135K)
2026-01-05	BUY	Market Buy	株式会社ワイエムピー	passive	608.6K	¥1,488	-0.5%	¥901M ($5.8M)
2023-02-28	BUY	Market Buy	東洋商事株式会社 Toyo Shoji Co., Ltd.	unknown	149.5K	¥1,500	-1.3%	¥224M ($1.4M)
2023-02-28	BUY	Market Buy	西神製罐株式会社 Seishin Seikan Co., Ltd.	unknown	200	¥1,500	-1.3%	¥300K ($2K)
2023-02-28	BUY	Market Buy	光洋機械産業株式会社 Koyo Machine Industry Co., Ltd.	unknown	200	¥1,500	-1.3%	¥300K ($2K)
2023-02-28	BUY	Market Buy	大和製罐株式会社 Daiwa Seikan Co., Ltd.	unknown	377.8K	¥1,500	-1.3%	¥567M ($3.7M)
2023-02-28	BUY	Market Buy	山口久一 Hisaichi Yamaguchi	unknown	49.6K	¥1,500	-1.3%	¥74M ($480K)
2023-02-28	SELL	Market Buy	山口久一 Hisaichi Yamaguchi	passive	49.6K	¥1,500	+1.3%	¥25M ($160K)
2023-02-28	BUY	Market Buy	山口興産株式会社 Yamaguchi Kosan Co., Ltd.	unknown	31.3K	¥1,500	-1.3%	¥47M ($303K)
2023-02-28	BUY	Market Buy	山口邦子 Kuniko Yamaguchi	unknown	500	¥1,500	-1.3%	¥750K ($5K)
2023-02-28	BUY	Market Buy	山口裕久 Hirohisa Yamaguchi	passive	8.1K	¥1,500	-1.3%	¥296M ($1.9M)
2023-02-28	SELL	Market Buy	株式会社ワイエムピー Y.M.P.CO.,LTD.	passive	558.0K	¥1,500	+1.3%	¥5M ($34K)
2021-12-07	SELL	negotiated	阪上正章 Masaaki Sakagami	activist	434.4K	¥2,241	+34.0%	¥119M ($770K)
2021-12-07	BUY	Market Buy	エスケー興産株式会社 SK Kosan Co., Ltd.	activist	575.8K	¥2,241	-34.0%	¥141M ($913K)
2021-12-07	BUY	negotiated	阪上正章 Masaaki Sakagami	activist	434.4K	¥2,241	-34.0%	¥119M ($770K)

Frequently asked questions

Who has been buying Seiwa Chuo Holdings Corporation stock?: 12 distinct investors have filed 6 disclosed large-shareholding filings in Seiwa Chuo Holdings Corporation (7531), most recently on 2026-05-08. 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 Seiwa Chuo Holdings Corporation have?: Seiwa Chuo Holdings Corporation has 6 buy-side and 6 sell-side disclosures on record, covering ¥3.4B ($22.1M) in total reported value, spanning 2021-12-07 to 2026-05-08.
Where does StockDrifts get Seiwa Chuo Holdings Corporation 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 Seiwa Chuo Holdings Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.