Who has been buying Chuo Spring Co.,Ltd. stock?

11 distinct investors have filed 35 disclosed large-shareholding filings in Chuo Spring Co.,Ltd. (5992), most recently on 2026-03-09. 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 Chuo Spring Co.,Ltd. have?

Chuo Spring Co.,Ltd. has 35 buy-side and 12 sell-side disclosures on record, covering ¥30.0B ($193.2M) in total reported value, spanning 2021-12-09 to 2026-03-09.

Where does StockDrifts get Chuo Spring 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.

Chuo Spring Co.,Ltd. 5992

Company

中央発條株式会社Chuo Spring Co.,Ltd.

Investors

Buys

Total Value

¥30.0B ($193.2M)

Avg Return

+164.36%

Last Filing

2026-03-09

Chuo Spring Co.,Ltd. (5992) has 35 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥30.0B ($193.2M) in reported transaction value. The earliest filing StockDrifts holds for Chuo Spring Co.,Ltd. is dated 2021-12-09; the most recent is 2026-03-09. 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 +164.36%, 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
2026-08-06	BUY	Market Buy	株式会社ドリームキャリア	activist	45.4K	¥3,720	+0.4%	¥171M ($1.1M)
2026-08-06	BUY	Market Buy	株式会社UESHIMA	activist	249.2K	¥3,720	+0.4%	¥494M ($3.2M)
2026-08-06	BUY	unknown	株式会社ドリームキャリアホールディングス	activist	130.0K	¥3,720	+0.4%	¥484M ($3.1M)
2026-08-06	BUY	Market Buy	株式会社ナチュラリ	activist	1.4M	¥3,720	+0.4%	¥171M ($1.1M)
2026-08-06	BUY	unknown	植島幹九郎	activist	1.8M	¥3,720	+0.4%	¥6.5B ($42.1M)
2026-08-06	BUY	Market Buy	株式会社DOE5パーセント	activist	625.2K	¥3,720	+0.4%	¥247M ($1.6M)
2026-07-23	BUY	unknown	株式会社ドリームキャリアホールディングス	activist	130.0K	¥3,750	-0.4%	¥488M ($3.1M)
2026-07-23	BUY	Market Buy	株式会社UESHIMA	activist	118.2K	¥3,750	-0.4%	¥441M ($2.8M)
2026-07-23	SELL	unknown	株式会社ナチュラリ	activist	1.3M	¥3,750	+0.4%	¥144M ($927K)
2026-07-23	BUY	unknown	植島幹九郎	activist	1.8M	¥3,750	-0.4%	¥6.6B ($42.5M)
2026-07-23	BUY	Market Buy	株式会社DOE5パーセント	activist	560.5K	¥3,750	-0.4%	¥718M ($4.6M)
2026-06-15	BUY	Market Buy	株式会社ドリームキャリアホールディングス	activist	130.0K	¥3,840	-2.2%	¥500M ($3.2M)
2026-06-15	BUY	Market Buy	株式会社UESHIMA	activist	1.2K	¥3,840	-2.2%	¥5M ($30K)
2026-06-15	SELL	Market Buy	株式会社ナチュラリ	activist	1.4M	¥3,840	+2.2%	¥1.8B ($11.9M)
2026-06-15	BUY	Market Buy	植島幹九郎	activist	1.8M	¥3,840	-2.2%	¥6.7B ($43.5M)
2026-06-15	BUY	Market Buy	株式会社DOE5パーセント	activist	367.0K	¥3,840	-2.2%	¥1.4B ($8.8M)
2026-06-08	BUY	Market Buy	株式会社ナチュラリ	activist	1.8M	¥3,825	+0.9%	¥7.0B ($45.0M)
2026-06-08	SELL	Market Buy	植島幹九郎	activist	1.8M	¥3,825	-0.9%	¥6.5B ($42.0M)
2026-06-08	BUY	Market Buy	株式会社DOE5パーセント	activist	13.4K	¥3,825	+0.9%	¥49M ($315K)
2026-03-09	SELL	Market Buy	株式会社ドリームキャリアホールディングス	activist	0	¥3,350	-10.3%	-
2026-03-09	SELL	Market Buy	株式会社ナチュラリ	activist	11.1K	¥3,350	-10.3%	¥41M ($265K)
2026-03-09	BUY	Market Buy	植島幹九郎	activist	3.5M	¥3,350	+10.3%	¥12.8B ($82.4M)
2026-03-09	BUY	Market Buy	株式会社DOE5パーセント	activist	100	¥3,350	-10.3%	¥370K ($2K)
2025-08-26	BUY	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	12.8K	¥3,320	+11.3%	¥1.7B ($10.9M)
2025-08-26	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥3,320	+11.3%	¥41M ($263K)
2025-08-26	BUY	Market Buy	植島幹九郎 Kankuro Ueshima	activist	3.2M	¥3,320	+11.3%	¥899M ($5.8M)
2025-08-06	BUY	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	8.2K	¥3,035	+21.8%	¥25M ($161K)
2025-08-06	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥3,035	+21.8%	¥37M ($241K)
2025-08-06	BUY	Market Buy	植島幹九郎 Kankuro Ueshima	activist	2.9M	¥3,035	+21.8%	¥923M ($6.0M)
2025-07-31	BUY	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	8.2K	¥3,030	+21.9%	¥25M ($160K)
2025-07-31	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥3,030	+21.9%	¥37M ($240K)
2025-07-31	BUY	Market Buy	植島幹九郎 Kankuro Ueshima	activist	2.6M	¥3,030	+21.9%	¥472M ($3.0M)
2025-07-30	SELL	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	8.2K	¥2,996	-23.3%	¥4.3B ($27.7M)
2025-07-30	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥2,996	+23.3%	¥37M ($238K)
2025-07-30	BUY	Market Buy	植島幹九郎 Kankuro Ueshima	activist	2.5M	¥2,996	+23.3%	¥7.4B ($47.4M)
2025-07-16	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥2,021	+82.8%	¥25M ($160K)
2025-07-16	BUY	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	2.2M	¥2,021	+82.8%	¥2.7B ($17.2M)
2025-07-16	SELL	Market Buy	株式会社UESHIMA UESHIMA Co., Ltd.	activist	0	¥2,021	-82.8%	¥1.5B ($9.5M)
2025-07-16	SELL	Market Buy	植島幹九郎 Kankuro Ueshima	activist	0	¥2,021	-82.8%	¥232M ($1.5M)
2025-07-16	SELL	Market Buy	株式会社DOE5パーセント DOE5% Co., Ltd.	activist	0	¥2,021	-82.8%	¥790M ($5.1M)
2025-07-07	BUY	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	885.7K	¥1,658	+122.9%	¥1.1B ($7.2M)
2025-07-07	BUY	Market Buy	株式会社UESHIMA UESHIMA Co., Ltd.	activist	728.7K	¥1,658	+122.9%	¥1.2B ($7.8M)
2025-07-07	BUY	Market Buy	株式会社DOE5パーセント DOE5% Co., Ltd.	activist	391.9K	¥1,658	+122.9%	¥271M ($1.7M)
2025-07-07	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥1,658	+122.9%	¥20M ($132K)
2025-07-07	SELL	Market Buy	植島幹九郎 Kankuro Ueshima	activist	115.1K	¥1,658	-122.9%	¥1.1B ($7.2M)
2025-06-20	BUY	Market Buy	株式会社ナチュラリ Naturali Co., Ltd.	activist	214.1K	¥1,978	+86.8%	¥162M ($1.0M)
2025-06-20	BUY	Market Buy	株式会社ドリームキャリアホールディングス Dream Career Holdings Co., Ltd.	activist	12.3K	¥1,978	+86.8%	¥1.5B ($9.8M)
2025-06-20	BUY	Market Buy	株式会社DOE5パーセント DOE5% Co., Ltd.	activist	228.3K	¥1,978	+86.8%	¥30M ($196K)
2025-06-20	BUY	Market Buy	株式会社UESHIMA UESHIMA Co., Ltd.	activist	728.7K	¥1,978	+86.8%	¥227M ($1.5M)
2025-06-20	BUY	Market Buy	植島幹九郎 Kankuro Ueshima	activist	786.7K	¥1,978	+86.8%	¥91M ($587K)

Showing the 50 most recent of 86 filings.

Frequently asked questions

Who has been buying Chuo Spring Co.,Ltd. stock?: 11 distinct investors have filed 35 disclosed large-shareholding filings in Chuo Spring Co.,Ltd. (5992), most recently on 2026-03-09. 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 Chuo Spring Co.,Ltd. have?: Chuo Spring Co.,Ltd. has 35 buy-side and 12 sell-side disclosures on record, covering ¥30.0B ($193.2M) in total reported value, spanning 2021-12-09 to 2026-03-09.
Where does StockDrifts get Chuo Spring 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 Chuo Spring Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.