Who has been buying Riskmonster.com stock?

5 distinct investors have filed 11 disclosed large-shareholding filings in Riskmonster.com (3768), most recently on 2025-12-11. 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 Riskmonster.com have?

Riskmonster.com has 11 buy-side and 2 sell-side disclosures on record, covering ¥628M ($4.0M) in total reported value, spanning 2021-12-20 to 2025-12-11.

Where does StockDrifts get Riskmonster.com 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.

Riskmonster.com 3768

Company

リスクモンスター株式会社Riskmonster.com

Investors

Buys

Total Value

¥628M ($4.0M)

Avg Return

-2.71%

Last Filing

2025-12-11

Riskmonster.com (3768) has 11 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥628M ($4.0M) in reported transaction value. The earliest filing StockDrifts holds for Riskmonster.com is dated 2021-12-20; the most recent is 2025-12-11. 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 -2.71%, 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
2026-08-07	BUY	Market Buy	株式会社UH6	passive	22.1K	¥563	-0.5%	¥12M ($80K)
2026-08-07	SELL	unknown	株式会社UH5	unknown	0	¥563	+0.5%	¥12M ($80K)
2026-08-07	BUY	Market Buy	株式会社UH Partners 3	passive	90.3K	¥563	-0.5%	¥43M ($277K)
2026-08-07	BUY	Market Buy	株式会社UH Partners 2	passive	559.8K	¥563	-0.5%	¥315M ($2.0M)
2026-08-07	BUY	Market Buy	光通信株式会社	passive	557.2K	¥563	-0.5%	¥314M ($2.0M)
2025-12-11	BUY	Market Buy	株式会社UH5	passive	22.1K	¥510	-9.8%	¥12M ($80K)
2025-12-11	BUY	Market Buy	株式会社UH Partners 3	passive	13.9K	¥510	-9.8%	¥8M ($50K)
2025-12-11	BUY	Market Buy	株式会社UH Partners 2	passive	559.8K	¥510	+9.8%	¥313M ($2.0M)
2025-12-11	BUY	Market Buy	光通信株式会社	passive	557.2K	¥510	-9.8%	¥312M ($2.0M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	518.9K	¥518	+8.1%	¥38M ($242K)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	557.2K	¥518	+8.1%	¥289M ($1.9M)
2025-07-25	BUY	Market Buy	藤本太一 TAICHI FUJIMOTO	activist	1.2M	¥499	+12.2%	¥43M ($280K)
2025-06-05	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	446.1K	¥502	+11.6%	¥42M ($270K)
2025-06-05	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	557.2K	¥502	+11.6%	¥280M ($1.8M)
2025-04-22	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	362.5K	¥495	+13.1%	¥38M ($246K)
2025-04-22	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	557.2K	¥495	-13.1%	¥3M ($20K)
2023-08-02	BUY	Market Buy	藤本太一 TAICHI FUJIMOTO	activist	1.1M	¥585	-4.3%	¥47M ($306K)
2023-08-02	BUY	unknown	藤本太一 TAICHI FUJIMOTO	activist	1.1M	¥585	-4.3%	¥47M ($306K)
2023-07-10	BUY	Market Buy	藤本太一 TAICHI FUJIMOTO	activist	1.0M	¥592	-5.4%	¥904K ($6K)
2022-09-07	BUY	unknown	藤本太一 TAICHI FUJIMOTO	activist	1.0M	¥710	-21.1%	¥720M ($4.6M)
2022-08-30	BUY	unknown	藤本太一 TAICHI FUJIMOTO	activist	1.0M	¥740	-24.3%	¥750M ($4.8M)
2022-07-15	BUY	Market Buy	藤本太一 TAICHI FUJIMOTO	activist	1.0M	¥706	-20.7%	¥69M ($445K)
2022-06-24	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	281.9K	¥719	-22.1%	¥57M ($368K)
2022-06-24	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	557.2K	¥719	-22.1%	¥401M ($2.6M)
2022-05-24	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	203.3K	¥782	-28.4%	¥96M ($621K)
2022-05-24	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	557.2K	¥782	-28.4%	¥436M ($2.8M)
2022-02-09	BUY	unknown	藤本太一 TAICHI FUJIMOTO	activist	907.2K	¥594	-5.7%	¥539M ($3.5M)
2021-12-28	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	80.3K	¥588	-4.8%	¥47M ($305K)
2021-12-28	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	557.2K	¥588	+4.8%	¥4M ($29K)
2021-12-20	BUY	Market Buy	藤本太一 TAICHI FUJIMOTO	activist	907.2K	¥582	-3.8%	¥140M ($904K)

Frequently asked questions

Who has been buying Riskmonster.com stock?: 5 distinct investors have filed 11 disclosed large-shareholding filings in Riskmonster.com (3768), most recently on 2025-12-11. 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 Riskmonster.com have?: Riskmonster.com has 11 buy-side and 2 sell-side disclosures on record, covering ¥628M ($4.0M) in total reported value, spanning 2021-12-20 to 2025-12-11.
Where does StockDrifts get Riskmonster.com 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 Riskmonster.com. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.