Who has been buying Socionext Inc. stock?

20 distinct investors have filed 124 disclosed large-shareholding filings in Socionext Inc. (6526), most recently on 2026-03-18. 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 Socionext Inc. have?

Socionext Inc. has 124 buy-side and 101 sell-side disclosures on record, covering ¥666.9B ($4.3B) in total reported value, spanning 2022-10-14 to 2026-03-18.

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.

Socionext Inc. 6526

Company

株式会社ソシオネクストSocionext Inc.

Investors

Buys

124

Total Value

¥666.9B ($4.3B)

Avg Return

-26.87%

Last Filing

2026-03-18

Socionext Inc. (6526) has 124 disclosed large-shareholding filings and 101 disclosed disposals on record, filed by 20 distinct investors. Together those filings cover ¥666.9B ($4.3B) in reported transaction value. The earliest filing StockDrifts holds for Socionext Inc. is dated 2022-10-14; the most recent is 2026-03-18. Across these filings the average return since disclosure is -26.87%, 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
2026-11-09	BUY	block_purchase	野村アセットマネジメント株式会社	other	17.5M	¥1,894.5	-12.2%	¥1.7B ($10.8M)
2026-11-09	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-616.3K	-	-	-
2026-11-09	BUY	Market Buy	野村證券株式会社	other	1.0M	¥1,894.5	-12.2%	¥955M ($6.2M)
2026-10-21	BUY	block_purchase	野村アセットマネジメント株式会社	other	16.6M	¥1,858.5	-10.5%	¥268M ($1.7M)
2026-10-21	SELL	unknown	アモーヴァ・アセットマネジメント株式会社	other	8.5M	¥1,858.5	+10.5%	¥67M ($432K)
2026-10-21	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社	other	4.0M	¥1,858.5	-10.5%	¥67M ($432K)
2026-10-21	BUY	Market Buy	ビー・エヌ・ピー・パリバ・エス・ア	other	192.7K	¥1,858.5	-10.5%	¥368M ($2.4M)
2026-10-21	SELL	unknown	BNP PARIBAS FINANCIAL MARKETS	other	307	¥1,858.5	+10.5%	¥4.6B ($29.8M)
2026-10-21	SELL	unknown	ビーエヌピーパリバセキュリティーズジャパンリミテッド	other	3.1M	¥1,858.5	+10.5%	¥7.4B ($47.5M)
2026-10-21	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	1.2M	¥1,858.5	-10.5%	¥2.3B ($14.7M)
2026-10-21	SELL	unknown	野村證券株式会社	other	527.6K	¥1,858.5	+10.5%	¥669M ($4.3M)
2026-10-08	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-6.2K	-	-	-
2026-10-08	BUY	block_purchase	野村アセットマネジメント株式会社	other	16.5M	¥2,260	-26.4%	¥81M ($525K)
2026-10-08	SELL	unknown	野村證券株式会社	other	877.3K	¥2,260	+26.4%	¥3.0B ($19.2M)
2026-10-07	BUY	unknown	BNP PARIBAS FINANCIAL MARKETS	other	2.5M	¥2,260	-26.4%	¥5.6B ($36.1M)
2026-10-07	BUY	unknown	BNP PARIBAS FINANCIAL MARKETS	other	2.5M	¥2,260	-26.4%	¥5.6B ($36.1M)
2026-10-07	BUY	unknown	ビーエヌピーパリバセキュリティーズジャパンリミテッド	other	7.1M	¥2,260	-26.4%	¥15.9B ($102.8M)
2026-10-07	BUY	unknown	ビーエヌピーパリバセキュリティーズジャパンリミテッド	other	7.1M	¥2,260	-26.4%	¥15.9B ($102.8M)
2026-10-01	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	540.1K	¥2,097.5	-20.7%	¥113M ($731K)
2026-10-01	BUY	block_purchase	野村アセットマネジメント株式会社	other	16.5M	¥2,097.5	-20.7%	¥3.5B ($22.9M)
2026-10-01	BUY	Market Buy	野村證券株式会社	other	2.2M	¥2,097.5	-20.7%	¥3.8B ($24.4M)
2026-09-24	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	8.5M	¥2,000	-16.8%	¥288M ($1.9M)
2026-09-24	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	4.0M	¥2,000	+16.8%	¥108M ($697K)
2026-09-24	SELL	unknown	野村證券株式会社	other	404.5K	¥2,000	+16.8%	¥504M ($3.3M)
2026-09-24	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	493.2K	¥2,000	-16.8%	¥612M ($3.9M)
2026-09-24	BUY	Market Buy	野村アセットマネジメント株式会社	other	14.8M	¥2,000	-16.8%	¥432M ($2.8M)
2026-09-04	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	8.4M	¥1,954	-14.9%	¥106M ($681K)
2026-09-04	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社	other	4.0M	¥1,954	-14.9%	¥281M ($1.8M)
2026-08-21	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	183.0K	¥1,990	+16.4%	¥72M ($462K)
2026-08-21	BUY	Market Buy	野村アセットマネジメント株式会社	other	14.5M	¥1,990	-16.4%	¥1.3B ($8.1M)
2026-08-21	BUY	Market Buy	野村證券株式会社	other	643.0K	¥1,990	-16.4%	¥430M ($2.8M)
2026-08-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	210.9K	¥1,981	+16.0%	¥891M ($5.8M)
2026-08-07	BUY	Market Buy	野村證券株式会社	other	429.3K	¥1,981	-16.0%	¥499M ($3.2M)
2026-08-07	SELL	unknown	野村アセットマネジメント株式会社	other	13.9M	¥1,981	+16.0%	¥856M ($5.5M)
2026-07-06	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	¥2,700	-38.4%	¥1.7B ($11.0M)
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	0	¥2,700	+38.4%	¥2.2B ($14.1M)
2026-07-06	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	2.6M	¥2,700	-38.4%	¥680M ($4.4M)
2026-07-06	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, N.A.	passive	1.8M	¥2,700	-38.4%	¥194M ($1.3M)
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(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	102.5K	¥2,700	+38.4%	¥389M ($2.5M)
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	0	¥2,700	+38.4%	¥2.9B ($18.5M)
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	0	¥2,700	+38.4%	¥632M ($4.1M)
2026-07-06	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	286.9K	¥2,700	+38.4%	¥389M ($2.5M)
2026-07-06	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	3.7M	¥2,700	+38.4%	¥2.6B ($16.9M)
2026-05-21	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	8.3M	¥2,637	-36.9%	¥1.7B ($11.0M)
2026-05-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	3.9M	¥2,637	+36.9%	¥1.6B ($10.1M)
2026-03-18	SELL	unknown	野村證券株式会社	other	178.8K	¥1,811.5	+8.2%	¥2.8B ($18.1M)
2026-03-18	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	666.2K	¥1,811.5	-	¥1.2B ($7.8M)
2026-03-18	BUY	unknown	野村アセットマネジメント株式会社	other	14.3M	¥1,811.5	-8.2%	¥2.3B ($15.1M)
2026-02-05	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	14.8M	¥2,087	+20.3%	¥3.2B ($20.6M)
2026-01-22	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	52.0K	¥2,360.5	-29.5%	¥1.6B ($10.4M)

Showing the 50 most recent of 200 filings.

Frequently asked questions

Who has been buying Socionext Inc. stock?: 20 distinct investors have filed 124 disclosed large-shareholding filings in Socionext Inc. (6526), most recently on 2026-03-18. 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 Socionext Inc. have?: Socionext Inc. has 124 buy-side and 101 sell-side disclosures on record, covering ¥666.9B ($4.3B) in total reported value, spanning 2022-10-14 to 2026-03-18.
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.