Who has been buying Super Tool Co. Ltd. stock?

12 distinct investors have filed 30 disclosed large-shareholding filings in Super Tool Co. Ltd. (5990), most recently on 2026-03-11. 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 Super Tool Co. Ltd. have?

Super Tool Co. Ltd. has 30 buy-side and 27 sell-side disclosures on record, covering ¥4.0B ($25.6M) in total reported value, spanning 2021-03-18 to 2026-03-11.

Where does StockDrifts get Super Tool 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.

Super Tool Co. Ltd. 5990

Company

株式会社スーパーツールSuper Tool Co. Ltd.

Investors

Buys

Total Value

¥4.0B ($25.6M)

Avg Return

-3.20%

Last Filing

2026-03-11

Super Tool Co. Ltd. (5990) has 30 disclosed large-shareholding filings and 27 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥4.0B ($25.6M) in reported transaction value. The earliest filing StockDrifts holds for Super Tool Co. Ltd. is dated 2021-03-18; the most recent is 2026-03-11. 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 -3.20%, 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
2026-05-19	BUY	Market Buy	株式会社スノーボールキャピタル	activist	30.4K	¥1,980	+0.1%	¥60M ($388K)
2026-05-19	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED	activist	443.3K	¥1,980	+0.1%	¥48M ($308K)
2026-03-11	BUY	Market Buy	株式会社スノーボールキャピタル	activist	30.4K	¥2,000	+0.0%	¥61M ($392K)
2026-03-11	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED	activist	419.2K	¥2,000	+0.0%	¥838M ($5.4M)
2025-11-11	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	activist	392.1K	¥1,950	+2.6%	¥48M ($307K)
2025-11-11	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	activist	30.4K	¥1,950	+2.6%	¥59M ($382K)
2025-08-06	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,975	+1.3%	¥60M ($387K)
2025-08-06	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	activist	30.4K	¥1,975	+1.3%	¥60M ($387K)
2025-08-06	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	activist	30.4K	¥1,975	+1.3%	¥60M ($387K)
2025-08-06	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	activist	367.6K	¥1,975	+1.3%	¥48M ($311K)
2025-08-06	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	activist	367.6K	¥1,975	+1.3%	¥48M ($311K)
2025-08-06	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	367.6K	¥1,975	+1.3%	¥48M ($311K)
2025-02-27	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	activist	30.4K	¥1,979	+1.1%	¥60M ($388K)
2025-02-27	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	activist	30.4K	¥1,979	+1.1%	¥60M ($388K)
2025-02-27	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	activist	343.3K	¥1,979	+1.1%	¥37M ($242K)
2025-02-27	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	activist	343.3K	¥1,979	+1.1%	¥37M ($242K)
2025-01-31	BUY	Market Buy	ホライズン株式会社 horaizun Inc.	passive	395.5K	¥1,950	+2.6%	¥47M ($304K)
2025-01-31	BUY	Market Buy	中正機械株式会社 Nakasho Machinery Co., Ltd.	passive	8.5K	¥1,950	+2.6%	¥17M ($107K)
2025-01-31	BUY	Market Buy	ホライズン株式会社 horaizun Inc.	passive	395.5K	¥1,950	+2.6%	¥47M ($304K)
2025-01-31	BUY	Market Buy	中正機械株式会社 Nakasho Machinery Co., Ltd.	passive	8.5K	¥1,950	+2.6%	¥17M ($107K)
2024-09-02	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥2,026	-1.3%	¥62M ($397K)
2024-09-02	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	324.4K	¥2,026	-1.3%	¥27M ($176K)
2024-07-22	BUY	Market Buy	ホライズン株式会社 horaizun Inc.	passive	371.4K	¥2,160	-7.4%	¥51M ($330K)
2024-07-22	BUY	Market Buy	中正機械株式会社 Nakasho Machinery Co., Ltd.	passive	8.5K	¥2,160	-7.4%	¥18M ($118K)
2024-01-30	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥2,009	-0.5%	¥61M ($394K)
2024-01-30	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	311.0K	¥2,009	-0.5%	¥54M ($347K)
2024-01-30	BUY	Market Buy	中正機械株式会社 Nakasho Machinery Co., Ltd.	passive	8.5K	¥2,009	-0.5%	¥17M ($110K)
2024-01-30	BUY	Market Buy	ホライズン株式会社 horaizun Inc.	passive	347.7K	¥2,009	-0.5%	¥48M ($310K)
2023-08-10	BUY	Market Buy	中正機械株式会社 Nakasho Machinery Co., Ltd.	passive	8.5K	¥1,957	+2.2%	¥17M ($107K)
2023-08-10	BUY	Market Buy	ホライズン株式会社 horaizun Inc.	passive	323.9K	¥1,957	+2.2%	¥46M ($299K)
2023-02-16	SELL	Market Buy	Hikari Investment BVI Limited	passive	0	¥1,965	-1.8%	¥21M ($138K)
2023-02-16	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	0	¥1,965	-1.8%	¥510M ($3.3M)
2023-02-16	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	284.1K	¥1,965	+1.8%	¥558M ($3.6M)
2023-02-16	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,965	+1.8%	¥60M ($385K)
2023-02-16	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	284.1K	¥1,965	+1.8%	¥558M ($3.6M)
2023-02-16	BUY	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,965	+1.8%	¥60M ($385K)
2023-02-16	SELL	Market Buy	Hikari Investment BVI Limited	passive	0	¥1,965	-1.8%	¥21M ($138K)
2023-02-16	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	0	¥1,965	-1.8%	¥510M ($3.3M)
2023-01-27	SELL	Market Buy	Hikari Investment BVI Limited	passive	11.0K	¥1,980	-1.0%	¥3M ($21K)
2023-01-27	SELL	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,980	-1.0%	¥7M ($48K)
2023-01-27	SELL	Market Buy	Hikari Investment BVI Limited	passive	11.0K	¥1,980	-1.0%	¥3M ($21K)
2023-01-27	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	259.9K	¥1,980	-1.0%	¥69M ($444K)
2023-01-27	SELL	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,980	-1.0%	¥7M ($48K)
2023-01-27	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	259.9K	¥1,980	-1.0%	¥69M ($444K)
2023-01-20	SELL	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,967	-1.7%	¥7M ($48K)
2023-01-20	SELL	Market Buy	Hikari Investment BVI Limited	passive	11.0K	¥1,967	-1.7%	¥3M ($21K)
2023-01-20	SELL	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,967	-1.7%	¥7M ($48K)
2023-01-20	SELL	Market Buy	Hikari Investment BVI Limited	passive	11.0K	¥1,967	-1.7%	¥3M ($21K)
2023-01-20	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	259.9K	¥1,967	-1.7%	¥68M ($441K)
2023-01-20	SELL	Market Buy	株式会社スノーボールキャピタル Snowball Capital Inc.	passive	30.4K	¥1,967	-1.7%	¥7M ($48K)

Showing the 50 most recent of 90 filings.

Frequently asked questions

Who has been buying Super Tool Co. Ltd. stock?: 12 distinct investors have filed 30 disclosed large-shareholding filings in Super Tool Co. Ltd. (5990), most recently on 2026-03-11. 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 Super Tool Co. Ltd. have?: Super Tool Co. Ltd. has 30 buy-side and 27 sell-side disclosures on record, covering ¥4.0B ($25.6M) in total reported value, spanning 2021-03-18 to 2026-03-11.
Where does StockDrifts get Super Tool 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 Super Tool Co. Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.