Who has been buying Advantest Corporation stock?

23 distinct investors have filed 44 disclosed large-shareholding filings in Advantest Corporation (6857), most recently on 2026-04-06. 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 Advantest Corporation have?

Advantest Corporation has 44 buy-side and 44 sell-side disclosures on record, covering ¥3.36T ($21.7B) in total reported value, spanning 2021-08-20 to 2026-04-06.

Where does StockDrifts get Advantest 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.

Advantest Corporation 6857

Company

株式会社アドバンテストAdvantest Corporation

Investors

Buys

Total Value

¥3.36T ($21.7B)

Avg Return

+528.71%

Last Filing

2026-04-06

Advantest Corporation (6857) has 44 disclosed large-shareholding filings and 44 disclosed disposals on record, filed by 23 distinct investors. Together those filings cover ¥3.36T ($21.7B) in reported transaction value. The earliest filing StockDrifts holds for Advantest Corporation is dated 2021-08-20; the most recent is 2026-04-06. 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 +528.71%, 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
2026-07-06	BUY	Market Buy	アペリオ・グループ・エルエルシー Aperio Group, LLC	passive	1.2M	¥29,565	+14.1%	¥35.1B ($226.7M)
2026-07-06	SELL	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	1.3M	¥29,565	-14.1%	¥2.2B ($14.0M)
2026-07-06	BUY	block_purchase	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	3.4M	¥29,565	+14.1%	¥2.2B ($14.0M)
2026-07-06	BUY	block_purchase	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, N.A.	passive	10.8M	¥29,565	+14.1%	¥2.2B ($14.0M)
2026-07-06	SELL	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	17.7M	¥29,565	-14.1%	¥19.5B ($125.7M)
2026-07-06	SELL	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	8.4M	¥29,565	-14.1%	¥10.8B ($69.8M)
2026-07-06	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	1.2M	¥29,565	+14.1%	¥2.2B ($14.0M)
2026-07-06	SELL	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	629.3K	¥29,565	-14.1%	¥106.0B ($684.2M)
2026-07-06	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	2.1M	¥29,565	+14.1%	¥62.4B ($402.7M)
2026-07-06	BUY	Market Buy	ブラックロック・インベストメント・マネジメント (オーストラリア)リミテッドLimited) BlackRock Investment Management (Australia	passive	868.3K	¥29,565	+14.1%	¥4.3B ($27.9M)
2026-07-06	SELL	Market Buy	ブラックロック・アドバイザーズ・エルエルシー BlackRock Advisers, LLC	passive	1.0M	¥29,565	-14.1%	¥58.4B ($377.0M)
2026-07-06	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	18.2M	¥29,565	-14.1%	¥30.3B ($195.5M)
2026-07-06	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	2.2M	¥29,565	-14.1%	¥4.3B ($27.9M)
2026-04-06	BUY	Market Buy	野村證券株式会社	other	215.9K	¥21,930	+26.8%	¥1.6B ($10.4M)
2026-04-06	SELL	Market Buy	野村アセットマネジメント株式会社	other	89.1M	¥21,930	-26.8%	¥179.8B ($1.2B)
2026-04-06	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.4M	¥21,930	+26.8%	¥43.3B ($279.6M)
2026-03-23	BUY	unknown	野村アセットマネジメント株式会社	other	97.3M	¥22,730	+19.2%	¥2.6T ($17.0B)
2026-03-23	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	438.8K	¥22,730	-19.2%	¥11.9B ($76.7M)
2026-03-23	BUY	unknown	野村證券株式会社	other	138.7K	¥22,730	-19.2%	¥3.8B ($24.2M)
2026-02-16	BUY	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	3.4M	¥27,100	+0.0%	¥91.1B ($588.0M)
2026-02-16	BUY	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	passive	10.7M	¥27,100	+0.0%	¥289.6B ($1.9B)
2026-02-16	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	18.3M	¥27,100	+0.0%	¥497.2B ($3.2B)
2026-02-16	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	8.7M	¥27,100	+0.0%	¥235.1B ($1.5B)
2026-02-16	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	1.1M	¥27,100	+0.0%	¥29.5B ($190.5M)
2026-02-16	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	4.2M	¥27,100	+0.0%	¥114.8B ($740.9M)
2026-02-16	SELL	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	2.1M	¥27,100	+0.0%	¥56.6B ($365.2M)
2026-02-16	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	2.3M	¥27,100	+0.0%	¥62.6B ($404.0M)
2026-02-16	BUY	Market Buy	ブラックロック・インベストメント・マネジメント (オーストラリア)リミテッドLimited) BlackRock Investment Management (Australia	passive	760.6K	¥27,100	+0.0%	¥20.6B ($133.0M)
2026-02-16	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	1.3M	¥27,100	+0.0%	¥35.3B ($227.5M)
2026-02-16	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー(BlackRock Advisers	passive	3.0M	¥27,100	+0.0%	¥81.9B ($528.1M)
2026-02-16	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group	passive	1.1M	¥27,100	+0.0%	¥31.0B ($199.9M)
2026-02-16	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	19.2M	¥27,100	+0.0%	¥519.4B ($3.4B)
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	49.4M	¥15,020	+80.4%	¥13.8B ($89.1M)
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	21.9M	¥15,020	-80.4%	¥3.5B ($22.3M)
2025-06-17	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	1.2M	¥9,550	-183.8%	¥732M ($4.7M)
2025-06-17	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	9.9M	¥9,550	-183.8%	¥23.4B ($151.1M)
2025-06-17	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	16.4M	¥9,550	+183.8%	¥36.6B ($236.0M)
2025-06-17	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	7.8M	¥9,550	+183.8%	¥1.5B ($9.4M)
2025-06-17	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	831.2K	¥9,550	+183.8%	¥7.9B ($51.2M)
2025-06-17	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	2.0M	¥9,550	+183.8%	¥19.4B ($125.2M)
2025-06-17	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	3.2M	¥9,550	+183.8%	¥15.4B ($99.1M)
2025-06-17	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	2.2M	¥9,550	+183.8%	¥21.2B ($136.6M)
2025-06-17	SELL	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	885.0K	¥9,550	-183.8%	¥5.1B ($33.0M)
2025-06-17	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー(BlackRock Advisers BlackRock Advisers, LLC	passive	1.9M	¥9,550	+183.8%	¥10.2B ($66.1M)
2025-06-17	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group Aperio Group, LLC	passive	1.0M	¥9,550	+183.8%	¥9.6B ($61.9M)
2025-06-17	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	21.7M	¥9,550	+183.8%	¥29.3B ($188.8M)
2024-04-01	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	16.4M	¥6,481	-318.1%	¥3.0B ($19.2M)
2024-04-01	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	26.7M	¥6,481	+318.1%	¥30.3B ($195.4M)
2024-04-01	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	3.3M	¥6,481	-318.1%	¥24.8B ($160.2M)
2024-03-18	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	22.0M	¥6,686	+305.3%	¥29.2B ($188.4M)

Showing the 50 most recent of 113 filings.

Frequently asked questions

Who has been buying Advantest Corporation stock?: 23 distinct investors have filed 44 disclosed large-shareholding filings in Advantest Corporation (6857), most recently on 2026-04-06. 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 Advantest Corporation have?: Advantest Corporation has 44 buy-side and 44 sell-side disclosures on record, covering ¥3.36T ($21.7B) in total reported value, spanning 2021-08-20 to 2026-04-06.
Where does StockDrifts get Advantest 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 Advantest Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.