Who has been buying ONE CAREER Inc. stock?

4 distinct investors have filed 7 disclosed large-shareholding filings in ONE CAREER Inc. (4377), most recently on 2026-05-12. 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 ONE CAREER Inc. have?

ONE CAREER Inc. has 7 buy-side and 28 sell-side disclosures on record, covering ¥1.4B ($9.0M) in total reported value, spanning 2021-10-11 to 2026-05-12.

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.

ONE CAREER Inc. 4377

Company

株式会社ワンキャリアONE CAREER Inc.

Investors

Buys

Total Value

¥1.4B ($9.0M)

Avg Return

+117.78%

Last Filing

2026-05-12

ONE CAREER Inc. (4377) has 7 disclosed large-shareholding filings and 28 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.4B ($9.0M) in reported transaction value. The earliest filing StockDrifts holds for ONE CAREER Inc. is dated 2021-10-11; the most recent is 2026-05-12. Across these filings the average return since disclosure is +117.78%, 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
2026-05-12	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	907.2K	¥1,786	-32.1%	¥541M ($3.5M)
2026-03-23	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥1,800	+31.1%	¥400M ($2.6M)
2025-08-01	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.3M	¥2,236	-5.5%	¥411M ($2.6M)
2025-08-01	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.3M	¥2,236	-5.5%	¥411M ($2.6M)
2025-08-01	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,236	-5.5%	¥4M ($26K)
2025-08-01	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,236	-5.5%	¥4M ($26K)
2025-07-09	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.5M	¥2,125	-11.1%	¥379M ($2.4M)
2025-07-09	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,125	-11.1%	¥4M ($25K)
2025-07-09	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,125	-11.1%	¥4M ($25K)
2025-07-09	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.5M	¥2,125	-11.1%	¥379M ($2.4M)
2025-06-19	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.6M	¥2,170	-8.8%	¥390M ($2.5M)
2025-06-19	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,170	-8.8%	¥4M ($25K)
2025-06-19	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,170	-8.8%	¥4M ($25K)
2025-06-19	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.6M	¥2,170	-8.8%	¥390M ($2.5M)
2025-06-06	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	966.0K	¥2,216	-6.5%	¥768M ($5.0M)
2025-06-05	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.8M	¥2,243	-5.2%	¥222M ($1.4M)
2025-06-05	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.8M	¥2,243	-5.2%	¥222M ($1.4M)
2025-06-05	BUY	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,243	-	-
2025-06-05	BUY	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,243	-	-
2025-05-26	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥2,055	-14.8%	¥11M ($71K)
2025-05-26	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.9M	¥2,055	-14.8%	¥22M ($143K)
2025-05-15	SELL	unknown	宮下尚之 Takashi Miyashita	activist	7.9M	¥1,959	-20.5%	¥204M ($1.3M)
2025-05-15	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	3.0M	¥1,959	-20.5%	¥77M ($499K)
2025-03-11	SELL	unknown	長澤有紘 Arihiro Nagasawa	activist	285.8K	¥1,711.62	-37.9%	¥59M ($383K)
2024-12-26	SELL	unknown	宮下尚之 Takashi Miyashita	activist	2.6M	¥1,580.09	-49.4%	¥99M ($638K)
2024-12-26	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	1.0M	¥1,580.09	-49.4%	¥37M ($241K)
2024-10-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	431.4K	¥1,441.89	+63.7%	¥87M ($560K)
2024-08-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	371.3K	¥1,063.33	+121.9%	¥75M ($486K)
2023-11-30	SELL	unknown	長澤有紘 Arihiro Nagasawa	activist	315.4K	¥1,206.67	-95.6%	¥13M ($81K)
2023-07-25	SELL	unknown	宮下尚之 Takashi Miyashita	activist	2.6M	¥1,186.67	-98.9%	¥3M ($18K)
2023-07-25	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	1.0M	¥1,186.67	-98.9%	¥1M ($9K)
2023-03-23	BUY	unknown	宮下尚之 Takashi Miyashita	activist	2.6M	¥1,560.11	-	-
2023-03-23	BUY	unknown	株式会社MTM MTM Co., Ltd.	activist	1.0M	¥1,560.11	-	-
2023-03-01	BUY	unknown	宮下尚之 Takashi Miyashita	activist	2.6M	¥1,591.74	-	-
2023-03-01	SELL	unknown	宮下尚之 Takashi Miyashita	activist	2.6M	¥1,591.74	-48.3%	¥120M ($775K)
2023-03-01	SELL	unknown	株式会社MTM MTM Co., Ltd.	activist	1.0M	¥1,591.74	-48.3%	¥46M ($296K)
2023-03-01	BUY	unknown	株式会社MTM MTM Co., Ltd.	activist	1.0M	¥1,591.74	-	-
2022-02-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	293.3K	¥699	+237.6%	¥205M ($1.3M)
2021-10-11	BUY	unknown	長澤有紘 Arihiro Nagasawa	activist	315.0K	¥759.67	+210.7%	¥239M ($1.5M)
2021-10-11	BUY	unknown	株式会社MTM MTM Co., Ltd.	activist	1.0M	¥759.67	+210.7%	¥760M ($4.9M)
2021-10-11	BUY	unknown	宮下尚之 Takashi Miyashita	activist	2.6M	¥759.67	+210.7%	¥2.0B ($12.9M)

Frequently asked questions

Who has been buying ONE CAREER Inc. stock?: 4 distinct investors have filed 7 disclosed large-shareholding filings in ONE CAREER Inc. (4377), most recently on 2026-05-12. 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 ONE CAREER Inc. have?: ONE CAREER Inc. has 7 buy-side and 28 sell-side disclosures on record, covering ¥1.4B ($9.0M) in total reported value, spanning 2021-10-11 to 2026-05-12.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.