Who has been buying Seiwa Electric Mfg. Co., Ltd. stock?

5 distinct investors have filed 7 disclosed large-shareholding filings in Seiwa Electric Mfg. Co., Ltd. (6748), most recently on 2026-04-02. 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 Electric Mfg. Co., Ltd. have?

Seiwa Electric Mfg. Co., Ltd. has 7 buy-side and 9 sell-side disclosures on record, covering ¥289M ($1.9M) in total reported value, spanning 2021-03-30 to 2026-04-02.

Where does StockDrifts get Seiwa Electric Mfg. 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.

Seiwa Electric Mfg. Co., Ltd. 6748

Company

星和電機株式会社Seiwa Electric Mfg. Co., Ltd.

Investors

Buys

Total Value

¥289M ($1.9M)

Avg Return

+35.00%

Last Filing

2026-04-02

Seiwa Electric Mfg. Co., Ltd. (6748) has 7 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥289M ($1.9M) in reported transaction value. The earliest filing StockDrifts holds for Seiwa Electric Mfg. Co., Ltd. is dated 2021-03-30; the most recent is 2026-04-02. 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 +35.00%, 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
2026-07-03	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥725	+0.3%	¥725M ($4.7M)
2026-06-30	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥699	+6.6%	¥699M ($4.5M)
2026-06-30	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥699	+6.6%	¥699M ($4.5M)
2026-04-02	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥743	+2.4%	¥743M ($4.8M)
2026-03-31	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥722	+5.4%	¥722M ($4.7M)
2026-01-08	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥940	-18.4%	¥940M ($6.1M)
2026-01-08	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥940	-18.4%	¥940M ($6.1M)
2025-10-06	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥811	-5.4%	¥811M ($5.2M)
2025-10-06	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥811	-5.4%	¥811M ($5.2M)
2025-07-10	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥604	+27.0%	¥604M ($3.9M)
2025-07-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	unknown	0	¥567	-35.3%	¥13M ($82K)
2025-07-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	141.0K	¥567	+35.3%	¥80M ($516K)
2025-07-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥567	-35.3%	¥285M ($1.8M)
2025-07-02	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥559	+37.2%	¥559M ($3.6M)
2025-04-02	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥531	+44.4%	¥531M ($3.4M)
2025-04-01	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥524	+46.4%	¥524M ($3.4M)
2025-01-08	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥523	+46.6%	¥523M ($3.4M)
2025-01-06	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥524	+46.4%	¥524M ($3.4M)
2024-10-03	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥537	+42.8%	¥537M ($3.5M)
2024-10-01	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥536	+43.1%	¥536M ($3.5M)
2024-07-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	22.4K	¥582	+31.8%	¥13M ($84K)
2024-07-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	141.0K	¥582	+31.8%	¥82M ($529K)
2024-07-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	502.5K	¥582	+31.8%	¥292M ($1.9M)
2024-07-03	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥592	+29.6%	¥592M ($3.8M)
2024-07-02	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥608	+26.1%	¥608M ($3.9M)
2024-06-21	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	15.1K	¥559	-37.2%	¥43M ($277K)
2024-06-21	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	141.0K	¥559	+37.2%	¥79M ($509K)
2024-06-21	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	501.6K	¥559	+37.2%	¥740K ($5K)
2024-06-21	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	unknown	0	¥559	-37.2%	¥40M ($258K)
2024-04-03	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥564	+36.0%	¥564M ($3.6M)
2024-03-29	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥567	+35.3%	¥567M ($3.7M)
2024-01-09	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥488	+57.2%	¥488M ($3.1M)
2023-12-27	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥487	+57.5%	¥487M ($3.1M)
2023-10-12	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥491	+56.2%	¥491M ($3.2M)
2023-10-12	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥491	+56.2%	¥491M ($3.2M)
2023-07-11	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥540	+42.0%	¥540M ($3.5M)
2023-07-11	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥540	+42.0%	¥540M ($3.5M)
2023-04-06	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥474	+61.8%	¥474M ($3.1M)
2023-03-31	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥472	+62.5%	¥472M ($3.0M)
2023-01-06	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥434	+76.7%	¥434M ($2.8M)
2022-12-28	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥434	+76.7%	¥434M ($2.8M)
2022-10-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	90.8K	¥438	-75.1%	¥53M ($344K)
2022-10-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	141.0K	¥438	+75.1%	¥62M ($398K)
2022-10-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	500.0K	¥438	-75.1%	¥7M ($45K)
2022-10-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	72.0K	¥438	+75.1%	¥32M ($203K)
2022-10-04	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥434	+76.7%	¥434M ($2.8M)
2022-10-04	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥434	+76.7%	¥434M ($2.8M)
2022-07-04	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥492	+55.9%	¥492M ($3.2M)
2022-07-04	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥492	+55.9%	¥492M ($3.2M)
2022-04-01	BUY	unknown	公益財団法人京都青少年育成スポーツ財団 KYOTO JUNIOR SPORTS GUIDANCE FOUNDATION	other	1.0M	¥527	+45.5%	¥527M ($3.4M)

Showing the 50 most recent of 71 filings.

Frequently asked questions

Who has been buying Seiwa Electric Mfg. Co., Ltd. stock?: 5 distinct investors have filed 7 disclosed large-shareholding filings in Seiwa Electric Mfg. Co., Ltd. (6748), most recently on 2026-04-02. 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 Electric Mfg. Co., Ltd. have?: Seiwa Electric Mfg. Co., Ltd. has 7 buy-side and 9 sell-side disclosures on record, covering ¥289M ($1.9M) in total reported value, spanning 2021-03-30 to 2026-04-02.
Where does StockDrifts get Seiwa Electric Mfg. 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 Seiwa Electric Mfg. Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.