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

10 distinct investors have filed 16 disclosed large-shareholding filings in Alpen Co.,Ltd. (3028), most recently on 2026-01-05. 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 Alpen Co.,Ltd. have?

Alpen Co.,Ltd. has 16 buy-side and 11 sell-side disclosures on record, covering ¥58.2B ($375.4M) in total reported value, spanning 2021-07-26 to 2026-01-05.

Where does StockDrifts get Alpen 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.

Alpen Co.,Ltd. 3028

Company

株式会社アルペンAlpen Co.,Ltd.

Investors

Buys

Total Value

¥58.2B ($375.4M)

Avg Return

-19.79%

Last Filing

2026-01-05

Alpen Co.,Ltd. (3028) has 16 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥58.2B ($375.4M) in reported transaction value. The earliest filing StockDrifts holds for Alpen Co.,Ltd. is dated 2021-07-26; the most recent is 2026-01-05. 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 -19.79%, 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
2026-01-05	BUY	negotiated	株式会社ミズノ・ホールディングス	strategic	13.6M	¥2,297	+11.4%	¥27.6B ($178.3M)
2026-01-05	BUY	negotiated	水野敦之	activist	3.3M	¥2,297	+11.4%	¥6.8B ($43.7M)
2026-01-05	SELL	negotiated	水野泰三	activist	4.4M	¥2,297	+11.4%	¥9.0B ($58.2M)
2026-01-05	BUY	negotiated	株式会社ミズノ・ホールディングス	strategic	13.6M	¥2,297	+11.4%	¥27.6B ($178.3M)
2026-01-05	BUY	negotiated	水野敦之	activist	3.3M	¥2,297	+11.4%	¥6.8B ($43.7M)
2026-01-05	SELL	negotiated	水野泰三	activist	4.4M	¥2,297	+11.4%	¥9.0B ($58.2M)
2022-12-07	SELL	Market Buy	キャピタル・グループ・インベストメント・マネージメント・ピーティーイー・リミテッド Capital Group Investment Management Pte. Ltd.	passive	0	¥2,045	+0.5%	¥95M ($616K)
2022-12-07	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	532.2K	¥2,045	+0.5%	¥748M ($4.8M)
2022-12-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.1M	¥2,045	-0.5%	¥2.3B ($14.9M)
2022-12-07	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	unknown	63.3K	¥2,045	-0.5%	¥129M ($835K)
2022-12-07	SELL	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	63.3K	¥2,045	+0.5%	¥95M ($616K)
2022-12-07	SELL	Market Buy	キャピタル・インターナショナル・インク Capital International Inc	passive	52.4K	¥2,045	+0.5%	¥80M ($513K)
2022-09-26	BUY	Market Buy	キャピタル・グループ・インベストメント・マネージメント・ピーティーイー・リミテッド Capital Group Investment Management Pte. Ltd.	passive	46.1K	¥2,062	-1.3%	¥95M ($613K)
2022-09-26	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	unknown	107.2K	¥2,062	-1.3%	¥221M ($1.4M)
2022-09-26	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	897.4K	¥2,062	+1.3%	¥874M ($5.6M)
2022-09-26	SELL	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	107.2K	¥2,062	+1.3%	¥40M ($259K)
2022-09-26	SELL	Market Buy	キャピタル・インターナショナル・インク Capital International Inc	passive	90.4K	¥2,062	+1.3%	¥16M ($103K)
2022-09-26	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.1M	¥2,062	-1.3%	¥96M ($621K)
2022-07-12	SELL	negotiated	水野泰三 Mizuno Taizou	activist	6.8M	¥2,079	+2.1%	¥243M ($1.6M)
2022-07-12	SELL	negotiated	株式会社エー・エム・インターナショナル A.M. International Co., Ltd.	strategic	0	¥2,079	+2.1%	¥271M ($1.7M)
2022-07-12	BUY	negotiated	水野敦之 Atsuyuki Mizuno	activist	3.3M	¥2,079	-2.1%	¥267M ($1.7M)
2022-07-07	BUY	unknown	水野敦之 Atsuyuki Mizuno	activist	3.3M	¥2,060	-1.2%	¥6.9B ($44.2M)
2022-07-07	BUY	unknown	水野泰三 Taizo Mizuno	activist	6.8M	¥2,060	-1.2%	¥13.9B ($89.9M)
2022-07-07	BUY	acquisition	水野敦之 Atsuyuki Mizuno	activist	3.3M	¥2,060	-1.2%	¥264M ($1.7M)
2022-07-07	BUY	acquisition	水野泰三 Taizo Mizuno	activist	6.8M	¥2,060	-1.2%	¥240M ($1.6M)
2022-07-07	BUY	unknown	株式会社ミズノ・ホールディングス Mizuno Holdings Co.,Ltd.	strategic	13.6M	¥2,060	-1.2%	¥28.0B ($180.5M)
2022-07-07	BUY	acquisition	株式会社ミズノ・ホールディングス Mizuno Holdings Co.,Ltd.	strategic	13.6M	¥2,060	-1.2%	¥28.0B ($180.5M)
2021-08-20	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	unknown	132.0K	¥3,590	-43.3%	¥474M ($3.1M)
2021-08-20	BUY	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	1.4M	¥3,590	-43.3%	¥1.6B ($10.4M)
2021-08-20	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	132.0K	¥3,590	-43.3%	¥189M ($1.2M)
2021-08-20	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International Inc	passive	100.7K	¥3,590	-43.3%	¥131M ($844K)
2021-08-20	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.1M	¥3,590	-43.3%	¥4.1B ($26.2M)
2021-07-26	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	unknown	80.6K	¥3,140	-35.2%	¥253M ($1.6M)
2021-07-26	BUY	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	927.8K	¥3,140	-35.2%	¥2.9B ($18.8M)
2021-07-26	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	80.6K	¥3,140	-35.2%	¥253M ($1.6M)
2021-07-26	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International Inc	passive	65.6K	¥3,140	-35.2%	¥206M ($1.3M)
2021-07-26	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.1M	¥3,140	-35.2%	¥3.5B ($22.9M)

Frequently asked questions

Who has been buying Alpen Co.,Ltd. stock?: 10 distinct investors have filed 16 disclosed large-shareholding filings in Alpen Co.,Ltd. (3028), most recently on 2026-01-05. 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 Alpen Co.,Ltd. have?: Alpen Co.,Ltd. has 16 buy-side and 11 sell-side disclosures on record, covering ¥58.2B ($375.4M) in total reported value, spanning 2021-07-26 to 2026-01-05.
Where does StockDrifts get Alpen 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 Alpen Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.