Who has been buying Sumitomo Densetsu Co.,Ltd. stock?

7 distinct investors have filed 6 disclosed large-shareholding filings in Sumitomo Densetsu Co.,Ltd. (1949), 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 Sumitomo Densetsu Co.,Ltd. have?

Sumitomo Densetsu Co.,Ltd. has 6 buy-side and 7 sell-side disclosures on record, covering ¥160.3B ($1.0B) in total reported value, spanning 2022-11-22 to 2025-12-22.

Where does StockDrifts get Sumitomo Densetsu 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.

Sumitomo Densetsu Co.,Ltd. 1949

Company

住友電設株式会社Sumitomo Densetsu Co.,Ltd.

Investors

Buys

Total Value

¥160.3B ($1.0B)

Avg Return

-0.19%

Last Filing

2025-12-22

Sumitomo Densetsu Co.,Ltd. (1949) has 6 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥160.3B ($1.0B) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Densetsu Co.,Ltd. is dated 2022-11-22; 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 -0.19%, 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	SELL	acquisition	住電商事株式会社	unknown	0	¥9,700	+0.0%	-
2025-12-22	BUY	acquisition	住友電気工業株式会社	corporate	17.8M	¥9,700	+0.0%	¥172.9B ($1.1B)
2025-12-17	SELL	unknown	野村アセットマネジメント株式会社	other	478.4K	¥9,700	+0.0%	¥4.6B ($29.9M)
2025-12-17	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.3M	¥9,700	+0.0%	¥12.4B ($79.7M)
2025-12-17	SELL	unknown	野村證券株式会社	other	18.3K	¥9,700	+0.0%	¥177M ($1.1M)
2025-12-16	BUY	acquisition	大和ハウス工業株式会社 DAIWA HOUSE INDUSTRY CO., LTD.	activist	14.4M	¥9,680	+0.2%	¥139.3B ($898.7M)
2025-12-05	BUY	unknown	野村アセットマネジメント株式会社	other	506.2K	¥9,740	+0.4%	¥4.9B ($31.7M)
2025-12-05	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	951.9K	¥9,740	+0.4%	¥9.2B ($59.6M)
2025-12-05	BUY	unknown	野村證券株式会社	other	382.5K	¥9,740	-0.4%	¥3.7B ($23.9M)
2025-11-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	506.9K	¥9,730	-0.3%	¥4.9B ($31.8M)
2025-11-20	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.2M	¥9,730	-0.3%	¥11.6B ($75.1M)
2025-11-20	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	344.9K	¥9,730	-0.3%	¥3.4B ($21.6M)
2025-11-07	BUY	acquisition	住電商事株式会社 Sumiden Shoji Co., Ltd.	strategic	37.4K	¥9,730	-0.3%	¥364M ($2.3M)
2025-11-07	BUY	acquisition	住友電気工業株式会社 Sumitomo Electric Industries, Ltd.	corporate	17.8M	¥9,730	-0.3%	¥173.5B ($1.1B)
2023-11-08	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	1.6M	¥2,518	-285.2%	¥1.3B ($8.5M)
2023-06-22	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	2.1M	¥3,020	-221.2%	¥1.6B ($10.1M)
2022-11-22	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	2.6M	¥2,562	-278.6%	¥1.0B ($6.8M)

Frequently asked questions

Who has been buying Sumitomo Densetsu Co.,Ltd. stock?: 7 distinct investors have filed 6 disclosed large-shareholding filings in Sumitomo Densetsu Co.,Ltd. (1949), 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 Sumitomo Densetsu Co.,Ltd. have?: Sumitomo Densetsu Co.,Ltd. has 6 buy-side and 7 sell-side disclosures on record, covering ¥160.3B ($1.0B) in total reported value, spanning 2022-11-22 to 2025-12-22.
Where does StockDrifts get Sumitomo Densetsu 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 Sumitomo Densetsu Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.