Who has been buying Sumitomo Mitsui Trust Holdings, Inc. stock?

22 distinct investors have filed 15 disclosed large-shareholding filings in Sumitomo Mitsui Trust Holdings, Inc. (8309), most recently on 2025-09-19. 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 Sumitomo Mitsui Trust Holdings, Inc. have?

Sumitomo Mitsui Trust Holdings, Inc. has 15 buy-side and 9 sell-side disclosures on record, covering ¥31.1B ($200.6M) in total reported value, spanning 2021-12-21 to 2025-09-19.

Where does StockDrifts get Sumitomo Mitsui Trust Holdings, Inc. 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.

Sumitomo Mitsui Trust Holdings, Inc. 8309

Company

三井住友トラストグループ株式会社Sumitomo Mitsui Trust Holdings, Inc.

Investors

Buys

Total Value

¥31.1B ($200.6M)

Avg Return

+111.84%

Last Filing

2025-09-19

Sumitomo Mitsui Trust Holdings, Inc. (8309) has 15 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 22 distinct investors. Together those filings cover ¥31.1B ($200.6M) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Mitsui Trust Holdings, Inc. is dated 2021-12-21; the most recent is 2025-09-19. 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 +111.84%, 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
2025-09-19	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	11.7M	¥4,284	+23.9%	¥2.4B ($15.8M)
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	19.7M	¥4,284	-23.9%	¥24.4B ($157.7M)
2025-03-24	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	42.1M	¥3,994	+32.9%	¥20.7B ($133.8M)
2025-03-24	BUY	Market Buy	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥3,994	+32.9%	-
2025-03-24	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	2.2M	¥3,994	+32.9%	¥8.7B ($56.3M)
2024-03-22	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	14.3M	¥3,411	+55.6%	¥13.2B ($84.9M)
2024-03-22	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	735.9K	¥3,411	+55.6%	¥2.5B ($16.2M)
2024-03-22	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	1.8M	¥3,411	+55.6%	¥2.2B ($14.4M)
2024-03-22	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.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	9.4M	¥3,411	-55.6%	¥248M ($1.6M)
2024-03-22	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	12.9M	¥3,411	+55.6%	¥6.2B ($40.1M)
2024-03-22	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	4.5M	¥3,411	-55.6%	¥3.7B ($24.0M)
2024-03-22	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	3.5M	¥3,411	+55.6%	¥3.5B ($22.4M)
2024-03-22	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	2.0M	¥3,411	-55.6%	¥4.0B ($25.6M)
2024-03-22	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	744.8K	¥3,411	+55.6%	¥2.5B ($16.4M)
2024-03-22	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 BlackRock Financial Management, Inc.	passive	816.8K	¥3,411	+55.6%	¥2.8B ($18.0M)
2024-03-22	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group Aperio Group, LLC	passive	1.4M	¥3,411	+55.6%	¥1.5B ($9.6M)
2022-07-25	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	19.2M	¥2,132	+148.9%	¥40.4B ($260.8M)
2022-07-25	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	46.3K	¥2,132	+148.9%	¥6.4B ($41.3M)
2022-07-25	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	281.1K	¥2,132	-148.9%	¥1.1B ($7.2M)
2021-12-21	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	602.7K	¥1,935.5	+174.2%	¥1.2B ($7.5M)
2021-12-21	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	4.9M	¥1,935.5	-174.2%	¥12M ($75K)
2021-12-21	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	1.6M	¥1,935.5	+174.2%	¥3.2B ($20.5M)
2021-12-21	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	5.4M	¥1,935.5	+174.2%	¥19M ($122K)
2021-12-21	SELL	Market Buy	ブラックロック・インターナショナル・リミテッド BlackRock International Limited	passive	600	¥1,935.5	-174.2%	¥12M ($80K)
2021-12-21	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	5.7M	¥1,935.5	+174.2%	¥44M ($286K)
2021-12-21	SELL	Market Buy	ブラックロック・アドバイザーズリミテッドLimited) UK	passive	9.3K	¥1,935.5	-174.2%	¥14M ($89K)
2021-12-21	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	2.9M	¥1,935.5	+174.2%	¥28M ($183K)
2021-12-21	BUY	Market Buy	ブラックロック・ライフ・リミテッド BlackRock Life Limited	passive	240.9K	¥1,935.5	+174.2%	¥414M ($2.7M)
2021-12-21	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	44.0K	¥1,935.5	+174.2%	¥64M ($412K)
2021-12-21	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	1.3M	¥1,935.5	+174.2%	¥2.5B ($15.9M)
2021-12-21	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	319.3K	¥1,935.5	-174.2%	¥726K ($5K)
2021-12-21	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	213.2K	¥1,935.5	+174.2%	¥417M ($2.7M)
2021-12-21	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group Aperio Group, LLC	passive	510.8K	¥1,935.5	+174.2%	¥989M ($6.4M)

Frequently asked questions

Who has been buying Sumitomo Mitsui Trust Holdings, Inc. stock?: 22 distinct investors have filed 15 disclosed large-shareholding filings in Sumitomo Mitsui Trust Holdings, Inc. (8309), most recently on 2025-09-19. 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 Sumitomo Mitsui Trust Holdings, Inc. have?: Sumitomo Mitsui Trust Holdings, Inc. has 15 buy-side and 9 sell-side disclosures on record, covering ¥31.1B ($200.6M) in total reported value, spanning 2021-12-21 to 2025-09-19.
Where does StockDrifts get Sumitomo Mitsui Trust Holdings, Inc. 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 Sumitomo Mitsui Trust Holdings, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.