Who has been buying Taisei Corporation stock?

21 distinct investors have filed 15 disclosed large-shareholding filings in Taisei Corporation (1801), most recently on 2025-12-03. 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 Taisei Corporation have?

Taisei Corporation has 15 buy-side and 19 sell-side disclosures on record, covering ¥192.1B ($1.2B) in total reported value, spanning 2021-06-21 to 2025-12-03.

Where does StockDrifts get Taisei Corporation 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.

Taisei Corporation 1801

Company

大成建設株式会社Taisei Corporation

Investors

Buys

Total Value

¥192.1B ($1.2B)

Avg Return

+204.04%

Last Filing

2025-12-03

Taisei Corporation (1801) has 15 disclosed large-shareholding filings and 19 disclosed disposals on record, filed by 21 distinct investors. Together those filings cover ¥192.1B ($1.2B) in reported transaction value. The earliest filing StockDrifts holds for Taisei Corporation is dated 2021-06-21; the most recent is 2025-12-03. 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 +204.04%, 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
2025-12-03	BUY	Market Buy	野村アセットマネジメント株式会社	other	9.5M	¥13,435	+18.5%	¥151.0B ($974.5M)
2025-12-03	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	141.8K	¥13,435	-18.5%	¥2.3B ($14.6M)
2025-12-03	BUY	Market Buy	野村證券株式会社	other	157.8K	¥13,435	+18.5%	¥2.5B ($16.2M)
2025-09-19	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	4.4M	¥10,335	+54.1%	¥8.3B ($53.7M)
2025-09-19	SELL	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.4M	¥10,335	-54.1%	¥6.6B ($42.7M)
2024-12-23	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	7.4M	¥6,645	-139.7%	¥12.4B ($80.1M)
2024-11-11	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	9.2M	¥6,973	-128.4%	¥12.8B ($82.4M)
2024-09-30	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	11.2M	¥6,260	-154.4%	¥12.0B ($77.6M)
2024-04-22	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.9M	¥5,358	-197.2%	¥7.9B ($51.1M)
2024-04-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.9M	¥5,358	-197.2%	¥495M ($3.2M)
2024-04-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	269.6K	¥5,358	-197.2%	¥1.6B ($10.2M)
2024-02-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	5.1M	¥4,868	-227.1%	¥7.6B ($49.2M)
2024-02-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	578.1K	¥4,868	+227.1%	¥2.8B ($18.2M)
2024-02-22	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	4.4M	¥4,868	-227.1%	¥6.9B ($44.5M)
2023-08-03	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	2.4M	¥5,330	-198.8%	¥201M ($1.3M)
2023-08-03	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	3.1M	¥5,330	+198.8%	¥3.8B ($24.7M)
2023-08-03	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	1.1M	¥5,330	+198.8%	¥2.1B ($13.6M)
2023-08-03	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	105.0K	¥5,330	+198.8%	¥59.3B ($382.3M)
2023-08-03	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	473.1K	¥5,330	+198.8%	¥2.5B ($16.3M)
2023-08-03	BUY	Market Buy	ブラックロック・インベストメント・マネジメント・エルエルシー BlackRock Investment Management LLC	passive	191.5K	¥5,330	+198.8%	¥1.0B ($6.6M)
2023-08-03	SELL	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	185.8K	¥5,330	-198.8%	¥4.2B ($27.3M)
2023-08-03	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	4.1M	¥5,330	+198.8%	¥7.2B ($46.7M)
2023-08-03	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	391.1K	¥5,330	+198.8%	¥201M ($1.3M)
2023-07-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	3.7M	¥5,280	-201.6%	¥4.7B ($30.2M)
2023-07-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	6.2M	¥5,280	-201.6%	¥5.4B ($34.7M)
2023-06-19	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	13.4M	¥4,834	+229.4%	¥9.8B ($63.0M)
2023-05-10	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	6.6M	¥4,780	-233.2%	¥1.5B ($9.9M)
2023-05-10	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	46.3K	¥4,780	+233.2%	¥13.6B ($87.9M)
2023-05-10	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	5.9M	¥4,780	+233.2%	¥28.0B ($180.7M)
2023-04-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	7.0M	¥4,065	+291.8%	¥1.3B ($8.4M)
2023-04-07	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	5.9M	¥4,065	+291.8%	¥3.8B ($24.3M)
2023-04-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	924.7K	¥4,065	+291.8%	¥3.8B ($24.3M)
2023-01-13	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	12.1M	¥4,070	+291.3%	¥8.3B ($53.3M)
2022-10-31	SELL	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	920.0K	¥4,055	-292.7%	¥3.4B ($22.1M)
2022-10-31	BUY	Market Buy	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.1M	¥4,055	+292.7%	¥1.8B ($11.6M)
2022-10-31	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.9M	¥4,055	-292.7%	¥7.0B ($45.2M)
2022-01-14	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	11.2M	¥3,575	+345.4%	¥40.1B ($259.0M)
2021-06-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	5.4M	¥3,510	-353.7%	¥2.8B ($17.8M)
2021-06-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	8.6M	¥3,510	-353.7%	¥7.9B ($50.8M)

Frequently asked questions

Who has been buying Taisei Corporation stock?: 21 distinct investors have filed 15 disclosed large-shareholding filings in Taisei Corporation (1801), most recently on 2025-12-03. 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 Taisei Corporation have?: Taisei Corporation has 15 buy-side and 19 sell-side disclosures on record, covering ¥192.1B ($1.2B) in total reported value, spanning 2021-06-21 to 2025-12-03.
Where does StockDrifts get Taisei Corporation 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 Taisei Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.