Who has been buying Raysum Co., Ltd. stock?

3 distinct investors have filed 5 disclosed large-shareholding filings in Raysum Co., Ltd. (8890), most recently on 2025-01-20. 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 Raysum Co., Ltd. have?

Raysum Co., Ltd. has 5 buy-side and 7 sell-side disclosures on record, covering ¥61.3B ($395.6M) in total reported value, spanning 2021-12-14 to 2025-01-20.

Where does StockDrifts get Raysum 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.

Raysum Co., Ltd. 8890

Company

株式会社レーサムRaysum Co., Ltd.

Investors

Buys

Total Value

¥61.3B ($395.6M)

Avg Return

+214.44%

Last Filing

2025-01-20

Raysum Co., Ltd. (8890) has 5 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥61.3B ($395.6M) in reported transaction value. The earliest filing StockDrifts holds for Raysum Co., Ltd. is dated 2021-12-14; the most recent is 2025-01-20. 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 +214.44%, 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
2025-01-20	BUY	acquisition	ヒューリック株式会社 Hulic Co.,Ltd.	activist	26.7M	¥5,890	+0.0%	¥157.5B ($1.0B)
2024-11-12	BUY	unknown	Rays CompanyLimited Hong Kong	other	18.4M	¥5,890	+0.0%	¥108.2B ($697.8M)
2024-11-12	BUY	acquisition	ヒューリック株式会社 Hulic Co.,Ltd.	activist	8.4M	¥5,890	+0.0%	¥49.3B ($318.3M)
2024-11-07	BUY	unknown	Rays Company(Hong Kong)Limited Rays Company (Hong Kong) Limited	other	18.4M	¥5,890	+0.0%	¥108.2B ($697.8M)
2024-11-07	BUY	unknown	Rays Company(Hong Kong)Limited Rays Company (Hong Kong) Limited	other	18.4M	¥5,890	+0.0%	¥108.2B ($697.8M)
2024-10-31	BUY	acquisition	ヒューリック株式会社 Hulic Co.,Ltd.	activist	8.4M	¥5,890	+0.0%	¥49.3B ($318.3M)
2024-09-27	BUY	negotiated	Rays Company(Hong Kong)Limited Rays Company (Hong Kong) Limited	activist	18.4M	¥5,900	-0.2%	¥108.3B ($699.0M)
2024-04-10	SELL	negotiated	Rays Company(Hong Kong)Limited Rays Company (Hong Kong) Limited	activist	18.4M	¥3,710	-58.8%	¥7.4B ($47.6M)
2023-12-05	BUY	Market Buy	Rays Company(Hong Kong)Limited Rays Company (Hong Kong) Limited	activist	18.4M	¥3,105	+89.7%	¥5.6B ($36.0M)
2023-11-17	SELL	unknown	日本投資株式会社 Japan Investment Inc.	strategic	1.0K	¥3,385	-74.0%	¥9.6B ($62.0M)
2023-10-25	BUY	unknown	日本投資株式会社 Japan Investment Inc.	strategic	2.8M	¥3,215	+83.2%	¥9.1B ($58.9M)
2023-09-26	SELL	unknown	日本投資株式会社 Japan Investment Inc.	strategic	2.8M	¥3,340	-76.3%	¥233M ($1.5M)
2023-09-26	BUY	unknown	日本投資株式会社 Japan Investment Inc.	strategic	2.8M	¥3,340	+76.3%	¥233M ($1.5M)
2023-07-19	SELL	unknown	日本投資株式会社 Japan Investment Inc.	strategic	2.9M	¥2,942	-100.2%	¥941M ($6.1M)
2023-07-03	SELL	unknown	日本投資株式会社 Japan Investment Inc.	strategic	3.2M	¥3,010	-95.7%	¥937M ($6.0M)
2023-06-16	BUY	unknown	日本投資株式会社 Japan Investment Inc.	strategic	3.5M	¥3,120	+88.8%	¥11.1B ($71.3M)
2023-04-21	BUY	unknown	日本投資株式会社 Japan Investment Inc.	strategic	3.5M	¥1,336	+340.9%	¥4.7B ($30.5M)
2022-12-08	BUY	unknown	日本投資株式会社 Japan Investment Inc.	strategic	3.5M	¥1,316	+347.6%	¥4.7B ($30.1M)
2022-11-11	BUY	acquisition	Rays Company(Hong Kong)Limited Rays Company (Hong Kong) Limited	activist	18.4M	¥1,571	+274.9%	¥28.9B ($186.1M)
2022-11-11	SELL	Market Buy	Power One株式会社 Power One Co., Ltd.	strategic	3.5M	¥1,571	-274.9%	¥23.3B ($150.2M)
2022-09-28	BUY	Market Buy	Power One株式会社 Power One Co., Ltd.	strategic	18.4M	¥1,618	+264.0%	¥29.7B ($191.7M)
2022-09-01	BUY	Market Buy	Power One株式会社 Power One Co., Ltd.	strategic	18.4M	¥1,617	+264.3%	¥6.4B ($41.4M)
2022-07-29	SELL	unknown	Power One株式会社 Power One Co., Ltd.	strategic	18.4M	¥1,316	-347.6%	¥10.5B ($67.9M)
2022-07-29	BUY	unknown	Power One株式会社 Power One Co., Ltd.	strategic	18.4M	¥1,316	+347.6%	¥10.5B ($67.9M)
2022-06-30	BUY	unknown	Power One株式会社 Power One Co., Ltd.	strategic	26.4M	¥1,119	+426.4%	¥29.5B ($190.3M)
2022-06-03	BUY	Market Buy	Power One株式会社 Power One Co., Ltd.	strategic	26.4M	¥1,084	+443.4%	¥5.6B ($36.0M)
2021-12-14	BUY	unknown	Power One株式会社 Power One Co., Ltd.	strategic	26.4M	¥636	+826.1%	¥16.8B ($108.2M)

Frequently asked questions

Who has been buying Raysum Co., Ltd. stock?: 3 distinct investors have filed 5 disclosed large-shareholding filings in Raysum Co., Ltd. (8890), most recently on 2025-01-20. 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 Raysum Co., Ltd. have?: Raysum Co., Ltd. has 5 buy-side and 7 sell-side disclosures on record, covering ¥61.3B ($395.6M) in total reported value, spanning 2021-12-14 to 2025-01-20.
Where does StockDrifts get Raysum 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 Raysum Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.