Who has been buying Open House Group Co., Ltd. stock?

5 distinct investors have filed 6 disclosed large-shareholding filings in Open House Group Co., Ltd. (3288), most recently on 2025-10-14. 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 Open House Group Co., Ltd. have?

Open House Group Co., Ltd. has 6 buy-side and 7 sell-side disclosures on record, covering ¥46.0B ($296.7M) in total reported value, spanning 2021-06-04 to 2025-10-14.

Where does StockDrifts get Open House Group 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.

Open House Group Co., Ltd. 3288

Company

株式会社オープンハウスグループOpen House Group Co., Ltd.

Investors

Buys

Total Value

¥46.0B ($296.7M)

Avg Return

+86.83%

Last Filing

2025-10-14

Open House Group Co., Ltd. (3288) has 6 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥46.0B ($296.7M) in reported transaction value. The earliest filing StockDrifts holds for Open House Group Co., Ltd. is dated 2021-06-04; the most recent is 2025-10-14. 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 +86.83%, 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	いちごアセットマネジメント株式会社	engagement	200	¥8,800	-3.4%	¥2M ($11K)
2026-05-19	SELL	Market Buy	いちごトラスト・ピーティーイー・リミテッド Ichigo Trust Pte. Ltd.	passive	0	¥8,800	+3.4%	¥129.8B ($837.7M)
2026-05-19	BUY	block_purchase	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド Ichigo Asset Management International, Pte. Ltd.	passive	15.5M	¥8,800	-3.4%	¥136.6B ($881.5M)
2025-10-14	BUY	block_purchase	いちごアセットマネジメント株式会社 Ichigo Asset Management Co., Ltd.	engagement	200	¥7,318	+31.7%	¥1M ($9K)
2025-10-14	BUY	block_purchase	いちごトラスト・ピーティーイー・リミテッド Ichigo Trust Pte. Ltd.	activist	15.3M	¥7,318	+31.7%	¥8.9B ($57.6M)
2025-10-14	BUY	block_purchase	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド(Ichigo Asset Management International Ichigo Asset Management International Pte. Ltd.	activist	0	¥7,318	+31.7%	-
2024-12-11	SELL	unknown	荒井正昭 Masaaki Arai	activist	41.5M	¥5,776	-66.9%	¥6.6B ($42.3M)
2024-06-12	BUY	Market Buy	いちごアセットマネジメント株式会社 Ichigo Asset Management Co., Ltd.	engagement	200	¥4,658	+107.0%	¥932K ($6K)
2024-06-12	BUY	Market Buy	いちごトラスト・ピーティーイー・リミテッド Ichigo Trust Pte. Ltd.	activist	14.0M	¥4,658	+107.0%	¥5.8B ($37.7M)
2024-06-12	BUY	Market Buy	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド(Ichigo Asset Management International Ichigo Asset Management International Pte. Ltd.	activist	0	¥4,658	+107.0%	-
2024-04-26	BUY	Market Buy	いちごアセットマネジメント株式会社 Ichigo Asset Management Co., Ltd.	engagement	200	¥4,725	+104.0%	¥945K ($6K)
2024-04-26	BUY	Market Buy	いちごトラスト・ピーティーイー・リミテッド Ichigo Trust Pte. Ltd.	activist	12.8M	¥4,725	+104.0%	¥6.0B ($38.6M)
2024-04-26	BUY	Market Buy	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド(Ichigo Asset Management International Ichigo Asset Management International Pte. Ltd.	activist	0	¥4,725	+104.0%	-
2023-12-20	BUY	Market Buy	いちごアセットマネジメント株式会社 Ichigo Asset Management Co., Ltd.	engagement	200	¥4,178	+130.8%	¥836K ($5K)
2023-12-20	BUY	Market Buy	いちごトラスト・ピーティーイー・リミテッド Ichigo Trust Pte. Ltd.	activist	11.5M	¥4,178	+130.8%	¥5.2B ($33.5M)
2023-12-20	BUY	Market Buy	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド(Ichigo Asset Management International Ichigo Asset Management International Pte. Ltd.	activist	0	¥4,178	+130.8%	-
2023-11-29	SELL	unknown	荒井正昭 Masaaki Arai	activist	42.6M	¥4,195	-129.8%	¥4.8B ($30.7M)
2023-10-17	SELL	acquisition	株式会社オープンハウスグループ Open House Group Co., Ltd.	activist	21.2M	¥4,789	-101.3%	¥93.5B ($603.2M)
2022-11-22	BUY	Market Buy	荒井正昭 Masaaki Arai	activist	43.7M	¥5,860	+64.5%	¥11.8B ($76.1M)
2022-11-22	BUY	unknown	荒井正昭 Masaaki Arai	activist	43.7M	¥5,860	+64.5%	¥11.8B ($76.1M)
2022-09-21	BUY	Market Buy	いちごアセットマネジメント株式会社 Ichigo Asset Management Co., Ltd.	engagement	200	¥5,270	+82.9%	¥1M ($7K)
2022-09-21	BUY	Market Buy	いちごトラスト・ピーティーイー・リミテッド Ichigo Trust Pte. Ltd.	activist	10.3M	¥5,270	+82.9%	¥8.3B ($53.3M)
2022-09-21	BUY	Market Buy	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド(Ichigo Asset Management International Ichigo Asset Management International Pte. Ltd.	activist	0	¥5,270	+82.9%	-
2022-05-20	SELL	unknown	荒井正昭 Arai Masaaki	activist	43.7M	¥5,410	-78.2%	¥9.6B ($61.7M)
2022-05-19	SELL	unknown	荒井正昭 Arai Masaaki	activist	43.7M	¥5,060	-90.5%	¥9.3B ($59.8M)
2022-05-19	BUY	unknown	荒井正昭 Arai Masaaki	activist	45.5M	¥5,060	+90.5%	¥320M ($2.1M)
2021-12-03	SELL	unknown	荒井正昭 Arai Masaaki	activist	45.5M	¥6,570	-46.7%	¥8.2B ($52.9M)
2021-06-04	SELL	unknown	荒井正昭 Arai Masaaki	activist	46.8M	¥5,190	-85.8%	¥7.0B ($45.2M)

Frequently asked questions

Who has been buying Open House Group Co., Ltd. stock?: 5 distinct investors have filed 6 disclosed large-shareholding filings in Open House Group Co., Ltd. (3288), most recently on 2025-10-14. 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 Open House Group Co., Ltd. have?: Open House Group Co., Ltd. has 6 buy-side and 7 sell-side disclosures on record, covering ¥46.0B ($296.7M) in total reported value, spanning 2021-06-04 to 2025-10-14.
Where does StockDrifts get Open House Group 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 Open House Group Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.