Who has been buying System Research Co.,Ltd. stock?

5 distinct investors have filed 5 disclosed large-shareholding filings in System Research Co.,Ltd. (3771), most recently on 2026-05-12. 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 System Research Co.,Ltd. have?

System Research Co.,Ltd. has 5 buy-side and 5 sell-side disclosures on record, covering ¥217M ($1.4M) in total reported value, spanning 2021-04-07 to 2026-05-12.

Where does StockDrifts get System Research Co.,Ltd. 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.

System Research Co.,Ltd. 3771

Company

株式会社システムリサーチSystem Research Co.,Ltd.

Investors

Buys

Total Value

¥217M ($1.4M)

Avg Return

+53.53%

Last Filing

2026-05-12

System Research Co.,Ltd. (3771) has 5 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥217M ($1.4M) in reported transaction value. The earliest filing StockDrifts holds for System Research Co.,Ltd. is dated 2021-04-07; the most recent is 2026-05-12. 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 +53.53%, 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
2026-06-17	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	43.8K	¥1,787	+0.9%	¥78M ($505K)
2026-06-17	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	185.0K	¥1,787	+0.9%	¥64M ($414K)
2026-06-17	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	499.6K	¥1,787	+0.9%	¥208M ($1.3M)
2026-06-17	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	243.7K	¥1,787	+0.9%	¥106M ($684K)
2026-06-17	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	546.4K	¥1,787	+0.9%	¥84M ($540K)
2026-06-17	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	506.8K	¥1,787	+0.9%	¥33M ($212K)
2026-06-17	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.1M	¥1,787	+0.9%	¥51M ($328K)
2026-06-17	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	44.1K	¥1,787	+0.9%	¥79M ($509K)
2026-06-17	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	506.8K	¥1,787	+0.9%	¥906M ($5.8M)
2026-06-17	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.1M	¥1,787	-0.9%	¥3M ($19K)
2026-06-17	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	684.6K	¥1,787	+0.9%	¥273M ($1.8M)
2026-06-17	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	790.1K	¥1,787	+0.9%	¥188M ($1.2M)
2026-06-17	BUY	Market Buy	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	44.8K	¥1,787	+0.9%	¥3M ($19K)
2026-06-17	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	506.8K	¥1,787	+0.9%	¥906M ($5.8M)
2026-06-17	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.1M	¥1,787	+0.9%	¥2.0B ($12.9M)
2026-06-17	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	45.9K	¥1,787	+0.9%	¥82M ($529K)
2026-06-17	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	506.8K	¥1,787	+0.9%	¥906M ($5.8M)
2026-06-17	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.1M	¥1,787	-0.9%	¥3M ($19K)
2026-05-12	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.7M	¥1,737	+1.8%	¥2.9B ($18.7M)
2026-04-07	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.7M	¥1,762	-7.1%	¥2.9B ($19.0M)
2025-11-10	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.7M	¥1,972	-12.5%	¥3.3B ($21.3M)
2025-10-07	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.7M	¥2,095	-17.6%	¥193M ($1.2M)
2025-10-02	BUY	negotiated	山田美代子 Miyoko Yamada	strategic	230.4K	¥2,030	-15.0%	¥468M ($3.0M)
2025-10-02	BUY	negotiated	山田美代子 Miyoko Yamada	strategic	230.4K	¥2,030	-15.0%	¥468M ($3.0M)
2025-10-02	SELL	negotiated	山田敏行 Toshiyuki Yamada	activist	1.6M	¥2,030	+15.0%	¥1.6B ($10.5M)
2025-10-02	SELL	negotiated	山田敏行 Toshiyuki Yamada	activist	1.6M	¥2,030	+15.0%	¥1.6B ($10.5M)
2024-12-05	BUY	negotiated	山田美代子 Miyoko Yamada	strategic	230.4K	¥1,400	+23.3%	¥323M ($2.1M)
2024-12-05	SELL	negotiated	山田敏行 Toshiyuki Yamada	activist	2.4M	¥1,400	-23.3%	¥485M ($3.1M)
2021-10-05	BUY	unknown	伊藤まち子 Machiko Ito	other	126.0K	¥964.5	+79.0%	¥12M ($78K)
2021-10-05	BUY	unknown	伊藤まち子 Machiko Ito	other	126.0K	¥964.5	+79.0%	¥12M ($78K)
2021-10-05	SELL	unknown	伊藤範久 Norihisa Ito	other	369.0K	¥964.5	-79.0%	¥88M ($567K)
2021-10-05	SELL	unknown	伊藤範久 Norihisa Ito	other	369.0K	¥964.5	-79.0%	¥88M ($567K)
2021-05-21	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	790.1K	¥1,128	+53.0%	¥119M ($767K)
2021-04-07	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	684.6K	¥990	+74.3%	¥151M ($977K)

Frequently asked questions

Who has been buying System Research Co.,Ltd. stock?: 5 distinct investors have filed 5 disclosed large-shareholding filings in System Research Co.,Ltd. (3771), most recently on 2026-05-12. 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 System Research Co.,Ltd. have?: System Research Co.,Ltd. has 5 buy-side and 5 sell-side disclosures on record, covering ¥217M ($1.4M) in total reported value, spanning 2021-04-07 to 2026-05-12.
Where does StockDrifts get System Research Co.,Ltd. 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 System Research Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.