Who has been buying Sysmex Corporation stock?

19 distinct investors have filed 11 disclosed large-shareholding filings in Sysmex Corporation (6869), 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 Sysmex Corporation have?

Sysmex Corporation has 11 buy-side and 14 sell-side disclosures on record, covering ¥42.4B ($273.6M) in total reported value, spanning 2023-02-03 to 2025-12-03.

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.

Sysmex Corporation 6869

Company

シスメックス株式会社Sysmex Corporation

Investors

Buys

Total Value

¥42.4B ($273.6M)

Avg Return

-26.40%

Last Filing

2025-12-03

Sysmex Corporation (6869) has 11 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥42.4B ($273.6M) in reported transaction value. The earliest filing StockDrifts holds for Sysmex Corporation is dated 2023-02-03; the most recent is 2025-12-03. Across these filings the average return since disclosure is -26.40%, 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
2026-06-05	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	8.7M	¥1,493.5	-24.5%	¥376M ($2.4M)
2026-06-05	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	832.1K	¥1,493.5	-24.5%	¥1.3B ($8.5M)
2026-06-05	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	1.1M	¥1,493.5	-24.5%	¥94M ($607K)
2026-06-05	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	1.8M	¥1,493.5	-24.5%	¥7.0B ($44.9M)
2026-06-05	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	6.9M	¥1,493.5	-24.5%	¥4.9B ($31.5M)
2026-06-05	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, N.A.	passive	5.6M	¥1,493.5	-24.5%	¥3.5B ($22.4M)
2026-06-05	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	2.8M	¥1,493.5	-24.5%	¥1.1B ($7.3M)
2026-06-05	SELL	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	381.2K	¥1,493.5	-24.5%	¥846M ($5.5M)
2026-06-05	SELL	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク BlackRock Financial Management, Inc.	passive	1.3M	¥1,493.5	-24.5%	¥94M ($607K)
2026-06-05	BUY	Market Buy	アペリオ・グループ・エルエルシー Aperio Group, LLC	passive	1.1M	¥1,493.5	+24.5%	¥188M ($1.2M)
2026-06-05	SELL	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	497.7K	¥1,493.5	-24.5%	¥282M ($1.8M)
2026-06-01	BUY	Market Buy	有限会社中谷興産取締役和田妙子	other	34.3M	¥1,457	+27.6%	¥4.1B ($26.6M)
2026-06-01	BUY	unknown	和田妙子	other	19.5M	¥1,457	-	¥28.4B ($183.2M)
2026-06-01	BUY	unknown	ルソール株式会社代表取締役家次和子	other	14.3M	¥1,457	-	¥20.8B ($133.9M)
2026-06-01	BUY	unknown	家次和子	other	20.9M	¥1,457	-	¥30.5B ($196.5M)
2026-06-01	BUY	unknown	ルソール株式会社代表取締役家次和子	other	14.3M	¥1,457	-	¥20.8B ($133.9M)
2026-06-01	BUY	Market Buy	有限会社中谷興産取締役和田妙子	other	34.3M	¥1,457	+27.6%	¥4.1B ($26.6M)
2026-06-01	BUY	unknown	和田妙子	other	19.5M	¥1,457	-	¥28.4B ($183.2M)
2026-06-01	BUY	unknown	家次和子	other	20.9M	¥1,457	-	¥30.5B ($196.5M)
2026-05-22	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	9.0M	¥1,409	-32.0%	¥621M ($4.0M)
2026-05-22	BUY	Market Buy	アペリオ・グループ・エルエルシー Aperio Group, LLC	passive	1.0M	¥1,409	-	¥1.4B ($9.2M)
2026-05-22	SELL	Market Buy	ブラックロック・アドバイザーズ・エルエルシー	passive	422.6K	¥1,409	-32.0%	¥976M ($6.3M)
2026-05-22	BUY	Market Buy	BlackRock Financial Management,Inc.	passive	1.4M	¥1,409	-	-
2026-05-22	BUY	Market Buy	BlackRock Investment ManagementLimited Australia	passive	939.4K	¥1,409	+32.0%	¥355M ($2.3M)
2026-05-22	SELL	Market Buy	BlackRockBV Netherlands	passive	1.7M	¥1,409	-32.0%	¥177M ($1.1M)
2026-05-22	SELL	Market Buy	BlackRock Fund Managers Limited	passive	1.2M	¥1,409	-32.0%	¥710M ($4.6M)
2026-05-22	SELL	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	passive	697.1K	¥1,409	-32.0%	¥1.3B ($8.6M)
2026-05-22	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	passive	6.5M	¥1,409	+32.0%	¥443M ($2.9M)
2026-05-22	SELL	Market Buy	ブラックロック・ファンド・アドバイザーズ	passive	10.2M	¥1,409	-32.0%	¥89M ($572K)
2026-05-22	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.	passive	8.0M	¥1,409	-32.0%	¥2.7B ($17.7M)
2026-05-22	BUY	Market Buy	BlackRock Investment ManagementLimited UK	passive	3.6M	¥1,409	+32.0%	¥89M ($572K)
2025-12-03	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	1.6M	¥1,454	-	¥2.4B ($15.3M)
2025-12-03	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	passive	1.1M	¥1,454	-27.9%	¥2.1B ($13.6M)
2025-12-03	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	9.4M	¥1,454	-27.9%	¥183M ($1.2M)
2025-12-03	SELL	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group	passive	442.2K	¥1,454	-27.9%	¥366M ($2.4M)
2025-12-03	BUY	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク(BlackRock Financial Management	passive	1.3M	¥1,454	-	¥1.9B ($12.5M)
2025-12-03	SELL	Market Buy	ブラックロック・インベストメント・マネジメント・エルエルシー BlackRock Investment Management LLC	passive	557.8K	¥1,454	-27.9%	¥549M ($3.5M)
2025-12-03	BUY	Market Buy	ブラックロック・インベストメント・マネジメント (オーストラリア)リミテッドLimited) BlackRock Investment Management (Australia	passive	671.3K	¥1,454	-	¥976M ($6.3M)
2025-12-03	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	1.8M	¥1,454	+27.9%	¥183M ($1.2M)
2025-12-03	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	1.7M	¥1,454	-27.9%	¥641M ($4.1M)
2025-12-03	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	163.2K	¥1,454	-27.9%	¥1.7B ($11.2M)
2025-12-03	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	6.1M	¥1,454	+27.9%	¥1.2B ($7.7M)
2025-12-03	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	10.3M	¥1,454	+27.9%	¥2.3B ($14.8M)
2025-12-03	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	9.9M	¥1,454	+27.9%	¥4.7B ($30.1M)
2025-12-03	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	3.5M	¥1,454	+27.9%	¥3.9B ($25.4M)
2025-01-07	BUY	unknown	公益財団法人中谷財団 Nakatani Foundation	other	38.7M	¥2,842.5	-	-
2024-12-20	BUY	unknown	公益財団法人中谷医工計測技術振興財団 Nakatani Foundation for Advancement of Measuring Technologies in Biomedical Engineering	other	38.7M	¥2,915.5	-	¥24.0B ($155.1M)
2024-12-20	BUY	Market Buy	公益財団法人中谷医工計測技術振興財団 Nakatani Foundation for Advancement of Measuring Technologies in Biomedical Engineering	other	38.7M	¥2,915.5	-36.2%	¥24.0B ($155.1M)
2024-04-16	BUY	unknown	有限会社中谷興産取締役和田妙子 Nakatani Co.,Ltd.	other	31.6M	¥2,468.5	-24.7%	¥311M ($2.0M)
2024-04-16	BUY	Market Buy	有限会社中谷興産取締役和田妙子 Nakatani Co.,Ltd.	other	31.6M	¥2,468.5	-24.7%	¥311M ($2.0M)

Showing the 50 most recent of 65 filings.

Frequently asked questions

Who has been buying Sysmex Corporation stock?: 19 distinct investors have filed 11 disclosed large-shareholding filings in Sysmex Corporation (6869), 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 Sysmex Corporation have?: Sysmex Corporation has 11 buy-side and 14 sell-side disclosures on record, covering ¥42.4B ($273.6M) in total reported value, spanning 2023-02-03 to 2025-12-03.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.