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

5 distinct investors have filed 5 disclosed large-shareholding filings in UUUM Co.,Ltd. (3990), most recently on 2025-01-22. 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 UUUM Co.,Ltd. have?

UUUM Co.,Ltd. has 5 buy-side and 11 sell-side disclosures on record, covering ¥2.1B ($13.6M) in total reported value, spanning 2021-03-31 to 2025-01-22.

Where does StockDrifts get UUUM 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.

UUUM Co.,Ltd. 3990

Company

UUUM株式会社UUUM Co.,Ltd.

Investors

Buys

Total Value

¥2.1B ($13.6M)

Avg Return

-11.68%

Last Filing

2025-01-22

UUUM Co.,Ltd. (3990) has 5 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥2.1B ($13.6M) in reported transaction value. The earliest filing StockDrifts holds for UUUM Co.,Ltd. is dated 2021-03-31; the most recent is 2025-01-22. 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 -11.68%, 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
2025-01-22	BUY	subscription	株式会社フリークアウト・ホールディングス FreakOut Holdings, inc.	activist	20.2M	¥530	+0.0%	¥788M ($5.1M)
2025-01-09	SELL	unknown	東海東京証券株式会社 Tokai Tokyo Securities Co., Ltd.	other	0	¥531	+0.2%	¥553M ($3.6M)
2025-01-07	BUY	subscription	株式会社フリークアウト・ホールディングス FreakOut Holdings, inc.	activist	18.7M	¥530	+0.0%	¥4.2B ($27.4M)
2024-12-19	BUY	unknown	東海東京証券株式会社 Tokai Tokyo Securities Co., Ltd.	other	1.0M	¥531	-0.2%	¥552M ($3.6M)
2023-09-15	SELL	negotiated	鎌田和樹 KAZUKI KAMADA	activist	100	¥745	+28.9%	¥4.5B ($29.1M)
2023-09-15	SELL	Market Buy	梅田裕真 YUMA UMEDA	passive	0	¥745	+28.9%	¥1.3B ($8.7M)
2023-09-15	BUY	unknown	株式会社フリークアウト・ホールディングス FreakOut Holdings, inc.	activist	10.4M	¥745	-28.9%	¥7.8B ($50.0M)
2023-09-15	SELL	unknown	株式会社STPR STPR Inc.	unknown	0	¥745	+28.9%	¥768M ($5.0M)
2023-08-17	SELL	negotiated	鎌田和樹 KAZUKI KAMADA	activist	6.0M	¥719	+26.3%	¥19M ($120K)
2023-08-17	BUY	negotiated	鎌田和樹 KAZUKI KAMADA	activist	6.0M	¥719	-26.3%	¥4.3B ($28.1M)
2023-08-16	SELL	negotiated	鎌田和樹 KAZUKI KAMADA	activist	6.0M	¥723	+26.7%	¥19M ($121K)
2023-08-16	SELL	Market Buy	梅田裕真 YUMA UMEDA	passive	1.8M	¥723	+26.7%	¥143M ($923K)
2023-07-06	BUY	unknown	株式会社STPR STPR Inc.	activist	1.0M	¥750	-29.3%	¥773M ($5.0M)
2022-08-12	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.0M	¥1,097	-51.7%	¥434M ($2.8M)
2022-08-12	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.4M	¥1,097	-51.7%	¥659M ($4.3M)
2022-08-12	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.0M	¥1,097	-51.7%	¥434M ($2.8M)
2022-08-12	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.4M	¥1,097	-51.7%	¥659M ($4.3M)
2022-08-12	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.4M	¥1,097	-51.7%	¥659M ($4.3M)
2022-08-12	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.0M	¥1,097	-51.7%	¥434M ($2.8M)
2022-07-27	SELL	negotiated	鎌田和樹 kamada kazuki	activist	6.0M	¥1,167	+54.6%	¥464M ($3.0M)
2022-07-27	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.0M	¥1,167	-54.6%	¥462M ($3.0M)
2022-06-21	SELL	negotiated	鎌田和樹 kamada kazuki	activist	6.4M	¥1,393	+62.0%	¥837M ($5.4M)
2022-06-21	BUY	negotiated	鎌田和樹 kamada kazuki	activist	6.4M	¥1,393	-62.0%	¥837M ($5.4M)
2022-06-06	BUY	negotiated	鎌田和樹 kamada kazuki	activist	7.0M	¥1,403	-62.2%	¥9.9B ($63.8M)
2022-06-06	BUY	negotiated	鎌田和樹 kamada kazuki	activist	7.0M	¥1,403	-62.2%	¥73M ($468K)
2022-06-06	BUY	negotiated	鎌田和樹 kamada kazuki	activist	7.0M	¥1,403	-62.2%	¥73M ($468K)
2022-06-06	BUY	negotiated	鎌田和樹 kamada kazuki	activist	7.0M	¥1,403	-62.2%	¥73M ($468K)
2021-03-31	SELL	negotiated	鎌田和樹 kamada kazuki	activist	7.0M	¥1,839	+71.2%	¥122M ($787K)
2021-03-31	SELL	negotiated	鎌田和樹 Kazuki Kamada	activist	7.0M	¥1,839	+71.2%	¥395M ($2.5M)

Frequently asked questions

Who has been buying UUUM Co.,Ltd. stock?: 5 distinct investors have filed 5 disclosed large-shareholding filings in UUUM Co.,Ltd. (3990), most recently on 2025-01-22. 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 UUUM Co.,Ltd. have?: UUUM Co.,Ltd. has 5 buy-side and 11 sell-side disclosures on record, covering ¥2.1B ($13.6M) in total reported value, spanning 2021-03-31 to 2025-01-22.
Where does StockDrifts get UUUM 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 UUUM Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.