Who has been buying Nippon RAD Inc. stock?

4 distinct investors have filed 9 disclosed large-shareholding filings in Nippon RAD Inc. (4736), most recently on 2025-05-08. 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 Nippon RAD Inc. have?

Nippon RAD Inc. has 9 buy-side and 13 sell-side disclosures on record, covering ¥1.5B ($9.7M) in total reported value, spanning 2021-03-19 to 2025-05-08.

Where does StockDrifts get Nippon RAD Inc. 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.

Nippon RAD Inc. 4736

Company

日本ラッド株式会社Nippon RAD Inc.

Investors

Buys

Total Value

¥1.5B ($9.7M)

Avg Return

-8.86%

Last Filing

2025-05-08

Nippon RAD Inc. (4736) has 9 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.5B ($9.7M) in reported transaction value. The earliest filing StockDrifts holds for Nippon RAD Inc. is dated 2021-03-19; the most recent is 2025-05-08. 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 -8.86%, 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
2025-05-08	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	428.0K	¥708	+20.3%	¥758K ($5K)
2025-02-20	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	428.7K	¥849	+33.6%	¥909K ($6K)
2025-01-21	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	430.3K	¥832	+32.2%	¥13M ($83K)
2024-04-23	BUY	unknown	大塚隆一 Ryuichi Otsuka	activist	20.0K	¥1,033	-45.4%	¥21M ($133K)
2024-04-23	SELL	unknown	有限会社モールネット Mall Net Co., Ltd.	strategic	0	¥1,033	+45.4%	¥3M ($19K)
2024-04-23	BUY	unknown	有限会社モールネット Mall Net Co., Ltd.	strategic	288.0K	¥1,033	-45.4%	¥298M ($1.9M)
2024-04-23	BUY	unknown	有限会社モールネット Mall Net Co., Ltd.	strategic	288.0K	¥1,033	-45.4%	¥298M ($1.9M)
2024-04-23	BUY	unknown	大塚隆之 Takayuki Otsuka	activist	754.8K	¥1,033	-45.4%	¥780M ($5.0M)
2024-04-23	BUY	unknown	大塚隆之 Takayuki Otsuka	activist	754.8K	¥1,033	-45.4%	¥780M ($5.0M)
2024-04-23	BUY	unknown	大塚隆一 Ryuichi Otsuka	activist	20.0K	¥1,033	-45.4%	¥21M ($133K)
2024-04-23	BUY	unknown	有限会社モールネット Mall Net Co., Ltd.	strategic	288.0K	¥1,033	-45.4%	¥298M ($1.9M)
2024-01-10	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	445.8K	¥670	+15.8%	¥29M ($190K)
2023-11-07	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	489.4K	¥711	+20.7%	¥21M ($135K)
2023-10-05	BUY	unknown	有限会社モールネット Mall Net Co., Ltd.	strategic	288.0K	¥781	-27.8%	¥225M ($1.5M)
2023-10-05	SELL	unknown	大塚隆一 Ryuichi Otsuka	activist	20.0K	¥781	+27.8%	¥125M ($807K)
2023-07-06	BUY	unknown	有限会社モールネット Mall Net Co., Ltd.	strategic	288.0K	¥660	-14.6%	¥190M ($1.2M)
2023-07-06	BUY	unknown	大塚隆一 Ryuichi Otsuka	activist	180.0K	¥660	-14.6%	¥113M ($726K)
2023-07-06	BUY	unknown	大塚隆之 Takayuki Otsuka	activist	754.6K	¥660	-14.6%	¥498M ($3.2M)
2023-06-06	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	519.1K	¥662	+14.8%	¥35M ($226K)
2023-04-06	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	572.1K	¥485	+16.3%	¥277M ($1.8M)
2023-04-05	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	171.7K	¥515	-9.5%	¥212M ($1.4M)
2022-12-22	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	583.7K	¥450	-25.3%	¥22M ($140K)
2022-09-14	BUY	negotiated	有限会社モールネット Mall Net Co., Ltd.	passive	288.0K	¥456	+23.7%	¥131M ($847K)
2022-09-14	BUY	negotiated	大塚隆一 Ryuichi Otsuka	activist	932.5K	¥456	+23.7%	¥425M ($2.7M)
2022-05-27	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	631.7K	¥477	+18.2%	¥86M ($554K)
2022-04-21	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	451.9K	¥510	+10.6%	¥230M ($1.5M)
2022-04-06	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	52.8K	¥529	+6.6%	¥26M ($165K)
2022-01-25	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	457.9K	¥489	-15.3%	¥67M ($434K)
2022-01-06	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	595.4K	¥514	-9.7%	¥2M ($11K)
2021-04-16	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	598.7K	¥655	-13.9%	¥392M ($2.5M)
2021-04-15	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	598.6K	¥650	-13.2%	¥389M ($2.5M)
2021-04-05	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	598.7K	¥631.593	+10.7%	¥676K ($4K)
2021-03-19	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	600.0K	¥638.046	-11.6%	¥342K ($2K)

Frequently asked questions

Who has been buying Nippon RAD Inc. stock?: 4 distinct investors have filed 9 disclosed large-shareholding filings in Nippon RAD Inc. (4736), most recently on 2025-05-08. 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 Nippon RAD Inc. have?: Nippon RAD Inc. has 9 buy-side and 13 sell-side disclosures on record, covering ¥1.5B ($9.7M) in total reported value, spanning 2021-03-19 to 2025-05-08.
Where does StockDrifts get Nippon RAD Inc. 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 Nippon RAD Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.