Who has been buying SoftBank Group Corp. stock?

20 distinct investors have filed 35 disclosed large-shareholding filings in SoftBank Group Corp. (9984), most recently on 2026-01-21. 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 SoftBank Group Corp. have?

SoftBank Group Corp. has 35 buy-side and 18 sell-side disclosures on record, covering ¥2.14T ($13.8B) in total reported value, spanning 2021-05-19 to 2026-01-21.

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.

SoftBank Group Corp. 9984

Company

ソフトバンクグループ株式会社SoftBank Group Corp.

Investors

Buys

Total Value

¥2.14T ($13.8B)

Avg Return

+118.96%

Last Filing

2026-01-21

SoftBank Group Corp. (9984) has 35 disclosed large-shareholding filings and 18 disclosed disposals on record, filed by 20 distinct investors. Together those filings cover ¥2.14T ($13.8B) in reported transaction value. The earliest filing StockDrifts holds for SoftBank Group Corp. is dated 2021-05-19; the most recent is 2026-01-21. Across these filings the average return since disclosure is +118.96%, 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
2026-01-21	SELL	unknown	野村證券株式会社	other	83.7M	¥3,875	-58.7%	¥2.2B ($14.3M)
2026-01-21	BUY	unknown	野村アセットマネジメント株式会社	other	358.6M	¥3,875	+58.7%	¥2.2B ($14.3M)
2026-01-09	SELL	unknown	野村證券株式会社	other	84.4M	¥4,263	-44.3%	¥131.5B ($848.3M)
2026-01-09	SELL	unknown	野村アセットマネジメント株式会社	other	358.2M	¥4,263	-44.3%	¥2.4B ($15.7M)
2025-12-05	BUY	Market Buy	孫カンパニー合同会社	activist	2.1M	¥4,821.25	+27.6%	¥688M ($4.4M)
2025-12-05	SELL	Market Buy	孫アセットマネージメント合同会社	activist	27.6M	¥4,821.25	-27.6%	¥43.4B ($279.8M)
2025-12-05	BUY	Market Buy	孫ファミリー合同会社	activist	29.5M	¥4,821.25	+27.6%	¥4.1B ($26.6M)
2025-12-05	BUY	Market Buy	SAM WEALTH MANAGEMENT PTE. LTD.	activist	10.0M	¥4,821.25	-	¥48.2B ($311.0M)
2025-12-05	BUY	Market Buy	孫正義	activist	426.7M	¥4,821.25	+27.6%	¥58.5B ($377.5M)
2025-09-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	29.7M	¥4,482.5	-37.2%	¥59.3B ($382.6M)
2025-09-22	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	92.4M	¥4,482.5	-37.2%	¥15.8B ($102.0M)
2025-09-19	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	31.2M	¥4,593.75	-33.9%	¥29.0B ($187.3M)
2025-09-19	BUY	unknown	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	46.3M	¥4,593.75	+33.9%	¥21.6B ($139.4M)
2025-08-29	BUY	Market Buy	孫正義 SON MASAYOSHI	activist	426.7M	¥4,057.5	+51.6%	¥254.7B ($1.6B)
2025-08-29	BUY	negotiated	孫正義 SON MASAYOSHI	activist	426.7M	¥4,057.5	-	-
2025-08-29	BUY	negotiated	有限会社孫ホールディングス Son Holdings Co., Ltd.	activist	2.1M	¥4,057.5	-	-
2025-08-29	BUY	negotiated	孫アセットマネージメント合同会社 Son Asset Management LLC	activist	37.6M	¥4,057.5	-	-
2025-08-29	BUY	negotiated	孫ファミリー合同会社 Son Family LLC	activist	29.5M	¥4,057.5	-	-
2025-08-29	BUY	Market Buy	有限会社孫ホールディングス Son Holdings Co., Ltd.	activist	2.1M	¥4,057.5	+51.6%	¥119.3B ($769.6M)
2025-08-29	BUY	Market Buy	孫アセットマネージメント合同会社 Son Asset Management LLC	activist	37.6M	¥4,057.5	+51.6%	¥88.3B ($569.5M)
2025-08-29	SELL	Market Buy	孫コーポレーション合同会社 Son Corporation LLC	activist	0	¥4,057.5	-51.6%	¥66.2B ($427.1M)
2025-08-29	BUY	Market Buy	孫ファミリー合同会社 Son Family LLC	activist	29.5M	¥4,057.5	+51.6%	¥4.2B ($26.9M)
2023-04-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	42.9M	¥1,292.25	+375.9%	¥4.0B ($25.7M)
2023-04-07	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	1.0M	¥1,292.25	+375.9%	¥131.1B ($845.6M)
2023-04-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	95.9M	¥1,292.25	+375.9%	¥17.3B ($111.5M)
2023-02-20	SELL	negotiated	孫正義 SON MASAYOSHI	activist	426.7M	¥1,432.25	-329.4%	¥33.8B ($218.1M)
2023-02-20	BUY	negotiated	有限会社孫ホールディングス Son Holdings Co., Ltd.	activist	2.1M	¥1,432.25	-	-
2023-02-20	BUY	negotiated	孫アセットマネージメント合同会社 Son Asset Management LLC	activist	18.6M	¥1,432.25	-	-
2023-02-20	BUY	negotiated	孫コーポレーション合同会社 Son Corporation LLC	activist	19.1M	¥1,432.25	-	-
2023-02-20	BUY	negotiated	孫ファミリー合同会社 Son Family LLC	activist	33.5M	¥1,432.25	+329.4%	¥33.6B ($216.5M)
2022-12-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	46.7M	¥1,446.5	-325.2%	¥13.7B ($88.4M)
2022-12-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.7M	¥1,446.5	-	¥2.5B ($16.1M)
2022-12-22	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	96.6M	¥1,446.5	-325.2%	¥15.0B ($96.5M)
2022-11-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	48.7M	¥1,519.25	-304.8%	¥5.0B ($32.1M)
2022-11-21	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	44.2M	¥1,519.25	-304.8%	¥5.8B ($37.2M)
2022-06-06	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	47.9M	¥1,347.75	-356.3%	¥6.5B ($41.9M)
2022-06-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	52.0M	¥1,347.75	-356.3%	¥7.4B ($47.9M)
2022-05-23	SELL	negotiated	孫正義 SON MASAYOSHI	activist	450.2M	¥1,319	-366.3%	¥13.2B ($85.0M)
2022-05-23	BUY	negotiated	有限会社孫ホールディングス Son Holdings Co., Ltd.	activist	2.1M	¥1,319	-	-
2022-05-23	BUY	negotiated	孫アセットマネージメント合同会社 Son Asset Management LLC	activist	18.6M	¥1,319	-	-
2022-05-23	BUY	negotiated	孫コーポレーション合同会社 Son Corporation LLC	activist	19.1M	¥1,319	-	-
2022-05-23	BUY	negotiated	孫ファミリー合同会社 Son Family LLC	activist	10.0M	¥1,319	-	¥13.2B ($85.1M)
2022-03-15	BUY	negotiated	孫アセットマネージメント合同会社 Son Asset Management LLC	activist	18.6M	¥1,066.25	-	-
2022-03-15	BUY	negotiated	孫コーポレーション合同会社 Son Corporation LLC	activist	19.1M	¥1,066.25	-	-
2022-03-15	BUY	negotiated	有限会社孫ホールディングス Son Holdings Co., Ltd.	activist	2.1M	¥1,066.25	-	-
2022-03-15	BUY	negotiated	孫正義 SON MASAYOSHI	activist	460.2M	¥1,066.25	-	-
2022-01-19	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	56.1M	¥1,353	+354.6%	¥23.8B ($153.4M)
2022-01-19	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	107.1M	¥1,353	-354.6%	¥12.1B ($78.2M)
2022-01-19	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	56.1M	¥1,353	+354.6%	¥23.8B ($153.4M)
2022-01-19	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	107.1M	¥1,353	-354.6%	¥12.1B ($78.2M)

Showing the 50 most recent of 79 filings.

Frequently asked questions

Who has been buying SoftBank Group Corp. stock?: 20 distinct investors have filed 35 disclosed large-shareholding filings in SoftBank Group Corp. (9984), most recently on 2026-01-21. 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 SoftBank Group Corp. have?: SoftBank Group Corp. has 35 buy-side and 18 sell-side disclosures on record, covering ¥2.14T ($13.8B) in total reported value, spanning 2021-05-19 to 2026-01-21.
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.