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

7 distinct investors have filed 11 disclosed large-shareholding filings in LAC Co., Ltd. (3857), most recently on 2025-02-06. 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 LAC Co., Ltd. have?

LAC Co., Ltd. has 11 buy-side and 6 sell-side disclosures on record, covering ¥13.1B ($84.6M) in total reported value, spanning 2022-02-15 to 2025-02-06.

Where does StockDrifts get LAC 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.

LAC Co., Ltd. 3857

Company

株式会社ラックLAC Co., Ltd.

Investors

Buys

Total Value

¥13.1B ($84.6M)

Avg Return

+15.18%

Last Filing

2025-02-06

LAC Co., Ltd. (3857) has 11 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥13.1B ($84.6M) in reported transaction value. The earliest filing StockDrifts holds for LAC Co., Ltd. is dated 2022-02-15; the most recent is 2025-02-06. 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 +15.18%, 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
2025-02-06	BUY	acquisition	KDDI株式会社 KDDI CORPORATION	activist	31.0M	¥1,156	+0.0%	¥2.7B ($17.5M)
2025-01-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	289.9K	¥1,155	+0.1%	¥327M ($2.1M)
2025-01-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	17.0K	¥1,155	-0.1%	¥289M ($1.9M)
2025-01-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	30	¥1,155	-0.1%	¥419M ($2.7M)
2025-01-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥1,155	-0.1%	¥1.3B ($8.2M)
2025-01-20	SELL	unknown	株式会社野村総合研究所 Nomura Research Institute, Ltd.	unknown	0	¥1,156	+0.0%	¥3.6B ($23.3M)
2025-01-16	BUY	acquisition	KDDI株式会社 KDDI CORPORATION	activist	28.6M	¥1,153	+0.3%	¥21.7B ($140.1M)
2024-12-06	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	787.7K	¥1,157	-0.1%	¥911M ($5.9M)
2024-12-06	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	1.1M	¥1,157	-0.1%	¥366M ($2.4M)
2024-12-05	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.8M	¥1,156	+0.0%	¥2.1B ($13.5M)
2024-12-05	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	361.5K	¥1,156	+0.0%	¥418M ($2.7M)
2024-11-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	787.7K	¥1,149	+0.6%	¥905M ($5.8M)
2024-11-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	786.9K	¥1,149	+0.6%	¥904M ($5.8M)
2024-11-12	BUY	unknown	株式会社野村総合研究所 Nomura Research Institute, Ltd.	other	3.1M	¥1,155	+0.1%	¥3.6B ($23.3M)
2022-02-18	SELL	Market Buy	有限会社コスモス Cosmos Ltd.	unknown	0	¥743	-55.6%	¥5.1B ($33.0M)
2022-02-18	BUY	Market Buy	KDDI株式会社 KDDI CORPORATION	strategic	9.8M	¥743	+55.6%	¥5.1B ($33.0M)
2022-02-17	BUY	Market Buy	株式会社野村総合研究所 Nomura Research Institute, Ltd.	other	3.1M	¥750	+54.1%	¥2.3B ($15.1M)
2022-02-15	SELL	Market Buy	有限会社コスモス Cosmos Ltd.	strategic	6.9M	¥742	-55.8%	¥882M ($5.7M)
2022-02-15	BUY	Market Buy	KDDI株式会社 KDDI CORPORATION	strategic	2.9M	¥742	+55.8%	¥917M ($5.9M)

Frequently asked questions

Who has been buying LAC Co., Ltd. stock?: 7 distinct investors have filed 11 disclosed large-shareholding filings in LAC Co., Ltd. (3857), most recently on 2025-02-06. 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 LAC Co., Ltd. have?: LAC Co., Ltd. has 11 buy-side and 6 sell-side disclosures on record, covering ¥13.1B ($84.6M) in total reported value, spanning 2022-02-15 to 2025-02-06.
Where does StockDrifts get LAC 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 LAC Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.