Who has been buying WIN-Partners Co., Ltd. stock?

4 distinct investors have filed 5 disclosed large-shareholding filings in WIN-Partners Co., Ltd. (3183), most recently on 2025-07-07. 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 WIN-Partners Co., Ltd. have?

WIN-Partners Co., Ltd. has 5 buy-side and 3 sell-side disclosures on record, covering ¥2.2B ($14.2M) in total reported value, spanning 2021-09-24 to 2025-07-07.

Where does StockDrifts get WIN-Partners 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.

WIN-Partners Co., Ltd. 3183

Company

ウイン・パートナーズ株式会社WIN-Partners Co., Ltd.

Investors

Buys

Total Value

¥2.2B ($14.2M)

Avg Return

+13.93%

Last Filing

2025-07-07

WIN-Partners Co., Ltd. (3183) has 5 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥2.2B ($14.2M) in reported transaction value. The earliest filing StockDrifts holds for WIN-Partners Co., Ltd. is dated 2021-09-24; the most recent is 2025-07-07. 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 +13.93%, 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
2026-06-19	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	2.6M	¥1,225	-6.6%	¥415M ($2.7M)
2026-06-19	SELL	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	305.7K	¥1,225	-6.6%	¥142M ($916K)
2026-06-19	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	2.3M	¥1,225	-6.6%	¥359M ($2.3M)
2026-06-19	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	364.9K	¥1,225	+6.6%	¥75M ($482K)
2026-06-19	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	203.1K	¥1,225	+6.6%	¥249M ($1.6M)
2026-06-19	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	2.4M	¥1,225	+6.6%	¥75M ($482K)
2026-06-19	BUY	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	640.0K	¥1,225	+6.6%	¥784M ($5.1M)
2026-06-19	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	2.4M	¥1,225	-6.6%	¥617M ($4.0M)
2026-06-19	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	81.7K	¥1,225	+6.6%	¥100M ($646K)
2026-06-19	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	3.0M	¥1,225	+6.6%	¥684M ($4.4M)
2026-06-19	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	420.7K	¥1,225	+6.6%	¥415M ($2.7M)
2025-07-07	SELL	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	passive	0	¥1,319	+1.8%	¥2.1B ($13.4M)
2025-06-27	BUY	Market Buy	有限会社オフィスA Office A Limited Company	activist	7.1M	¥1,382	-6.3%	¥1.8B ($11.8M)
2025-06-27	BUY	Market Buy	秋沢英海 Hidemi Akizawa	activist	901.3K	¥1,382	-6.3%	¥4M ($27K)
2025-06-20	SELL	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	passive	1.6M	¥1,341	+3.4%	¥798M ($5.1M)
2023-09-07	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	passive	2.2M	¥1,118	+15.8%	¥372M ($2.4M)
2022-02-07	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	passive	1.8M	¥993	+30.4%	¥303M ($2.0M)
2021-12-07	BUY	Market Buy	シンフォニー・フィナンシャル・パートナーズ(シンガポール)ピーティーイー・リミテッド (Symphony Financial Partners (Singapore) Pte. Ltd.) Symphony Financial Partners (Singapore) Pte. Ltd.	passive	1.5M	¥952	+36.0%	¥1.5B ($9.4M)
2021-09-24	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	1.4M	¥996	-30.0%	¥434M ($2.8M)

Frequently asked questions

Who has been buying WIN-Partners Co., Ltd. stock?: 4 distinct investors have filed 5 disclosed large-shareholding filings in WIN-Partners Co., Ltd. (3183), most recently on 2025-07-07. 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 WIN-Partners Co., Ltd. have?: WIN-Partners Co., Ltd. has 5 buy-side and 3 sell-side disclosures on record, covering ¥2.2B ($14.2M) in total reported value, spanning 2021-09-24 to 2025-07-07.
Where does StockDrifts get WIN-Partners 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 WIN-Partners Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.