Who has been buying Sinfonia Technology Co.,Ltd. stock?

12 distinct investors have filed 14 disclosed large-shareholding filings in Sinfonia Technology Co.,Ltd. (6507), most recently on 2026-04-22. 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 Sinfonia Technology Co.,Ltd. have?

Sinfonia Technology Co.,Ltd. has 14 buy-side and 8 sell-side disclosures on record, covering ¥21.6B ($139.3M) in total reported value, spanning 2021-08-06 to 2026-04-22.

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.

Sinfonia Technology Co.,Ltd. 6507

Company

シンフォニアテクノロジー株式会社Sinfonia Technology Co.,Ltd.

Investors

Buys

Total Value

¥21.6B ($139.3M)

Avg Return

+138.43%

Last Filing

2026-04-22

Sinfonia Technology Co.,Ltd. (6507) has 14 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥21.6B ($139.3M) in reported transaction value. The earliest filing StockDrifts holds for Sinfonia Technology Co.,Ltd. is dated 2021-08-06; the most recent is 2026-04-22. Across these filings the average return since disclosure is +138.43%, 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
2026-04-22	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.7M	¥13,270	-3.8%	¥3.8B ($24.7M)
2026-04-22	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	48.8K	¥13,270	-	-
2026-04-22	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International, Inc.	passive	45.2K	¥13,270	-	-
2026-04-07	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	48.8K	¥12,200	+4.6%	¥595M ($3.8M)
2026-04-07	BUY	Market Buy	キャピタル・インターナショナル・インク(Capital International	passive	45.2K	¥12,200	+4.6%	¥551M ($3.6M)
2026-04-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.4M	¥12,200	+4.6%	¥17.6B ($113.7M)
2026-03-06	BUY	Market Buy	キャピタル・インターナショナル株式会社	passive	32.2K	¥11,610	-	¥374M ($2.4M)
2026-03-06	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	1.3M	¥11,610	-9.9%	¥2.2B ($14.5M)
2025-11-10	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	1.5M	¥9,690	-31.7%	¥4.9B ($31.7M)
2025-10-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	226.6K	¥10,730	+18.9%	¥2.4B ($15.7M)
2025-10-06	BUY	negotiated	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	975.0K	¥10,730	+18.9%	¥10.5B ($67.5M)
2025-10-06	BUY	negotiated	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	330.8K	¥10,730	+18.9%	¥3.5B ($22.9M)
2025-02-21	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.4M	¥6,070	-110.2%	¥2.0B ($13.2M)
2025-02-21	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	82.4K	¥6,070	-	-
2025-02-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	2.0M	¥6,540	+95.1%	¥2.6B ($16.8M)
2025-01-10	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	1.6M	¥5,960	+114.1%	¥9.5B ($61.5M)
2024-11-08	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.1M	¥6,260	+103.8%	¥6.6B ($42.3M)
2024-11-08	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-788	¥6,260	-117.3%	¥74.6B ($481.2M)
2024-11-08	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	217.2K	¥6,260	-103.8%	¥410M ($2.6M)
2024-09-24	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	119.9K	¥4,980	-	¥597M ($3.9M)
2024-09-24	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	284.2K	¥4,980	-	¥1.4B ($9.1M)
2024-09-24	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.3M	¥4,980	-156.2%	¥1.0B ($6.5M)
2024-06-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	226.6K	¥3,265	-	-
2024-06-06	SELL	negotiated	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	608.6K	¥3,265	-290.8%	¥1.1B ($7.2M)
2024-06-06	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	431.0K	¥3,265	+290.8%	¥350M ($2.3M)
2024-05-09	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.5M	¥3,320	+284.3%	¥5.0B ($32.4M)
2024-02-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥2,700	+372.6%	¥4.6B ($29.6M)
2024-02-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	82.4K	¥2,700	+372.6%	¥222M ($1.4M)
2021-08-06	SELL	unknown	株式会社神戸製鋼所 Kobe Steel, Ltd.	strategic	1.8M	¥1,235	-	¥1.4B ($9.1M)

Frequently asked questions

Who has been buying Sinfonia Technology Co.,Ltd. stock?: 12 distinct investors have filed 14 disclosed large-shareholding filings in Sinfonia Technology Co.,Ltd. (6507), most recently on 2026-04-22. 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 Sinfonia Technology Co.,Ltd. have?: Sinfonia Technology Co.,Ltd. has 14 buy-side and 8 sell-side disclosures on record, covering ¥21.6B ($139.3M) in total reported value, spanning 2021-08-06 to 2026-04-22.
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.