Who has been buying KSK Co.,Ltd. stock?

3 distinct investors have filed 6 disclosed large-shareholding filings in KSK Co.,Ltd. (9687), most recently on 2025-09-29. 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 KSK Co.,Ltd. have?

KSK Co.,Ltd. has 6 buy-side and 3 sell-side disclosures on record, covering ¥820M ($5.3M) in total reported value, spanning 2021-11-29 to 2025-09-29.

Where does StockDrifts get KSK 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.

KSK Co.,Ltd. 9687

Company

株式会社KSKKSK Co.,Ltd.

Investors

Buys

Total Value

¥820M ($5.3M)

Avg Return

+65.02%

Last Filing

2025-09-29

KSK Co.,Ltd. (9687) has 6 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥820M ($5.3M) in reported transaction value. The earliest filing StockDrifts holds for KSK Co.,Ltd. is dated 2021-11-29; the most recent is 2025-09-29. 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 +65.02%, 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
2026-06-24	BUY	Market Buy	株式会社エスアイエル	passive	99.1K	¥4,355	+0.0%	¥432M ($2.8M)
2026-06-24	BUY	Market Buy	株式会社UH Partners 3	passive	32.4K	¥4,355	+0.0%	¥141M ($910K)
2026-06-24	BUY	Market Buy	株式会社UH Partners 2	passive	455.9K	¥4,355	+0.0%	¥196M ($1.3M)
2026-06-24	BUY	Market Buy	光通信株式会社	passive	374.2K	¥4,355	+0.0%	¥1.6B ($10.5M)
2026-06-22	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	31.6K	¥4,330	+0.6%	¥137M ($882K)
2026-06-22	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	687.4K	¥4,330	+0.6%	¥56M ($363K)
2026-06-22	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) Fidelity Management & Research Company LLC	corporate	687.4K	¥4,330	+0.6%	¥56M ($363K)
2026-06-22	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	88.6K	¥4,330	+0.6%	¥384M ($2.5M)
2026-06-22	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	675.0K	¥4,330	-0.6%	¥53M ($341K)
2026-06-22	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	89.7K	¥4,330	+0.6%	¥3M ($21K)
2026-06-22	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	584.5K	¥4,330	-0.6%	¥393M ($2.5M)
2026-06-22	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	91.0K	¥4,330	+0.6%	¥7M ($43K)
2026-06-22	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	638.3K	¥4,330	+0.6%	¥235M ($1.5M)
2026-06-22	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	687.4K	¥4,330	+0.6%	¥56M ($363K)
2026-06-22	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) Fidelity Management & Research Company LLC	corporate	687.4K	¥4,330	+0.6%	¥56M ($363K)
2026-06-22	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	88.6K	¥4,330	+0.6%	¥384M ($2.5M)
2026-06-22	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	675.0K	¥4,330	-0.6%	¥53M ($341K)
2026-06-22	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	89.7K	¥4,330	+0.6%	¥3M ($21K)
2026-06-22	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	584.5K	¥4,330	-0.6%	¥393M ($2.5M)
2026-06-22	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	91.0K	¥4,330	+0.6%	¥7M ($43K)
2026-06-22	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	31.6K	¥4,330	+0.6%	¥137M ($882K)
2026-06-22	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	638.3K	¥4,330	+0.6%	¥235M ($1.5M)
2025-09-29	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	99.1K	¥4,365	-0.3%	¥433M ($2.8M)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	411.0K	¥4,365	-0.3%	¥267M ($1.7M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	374.2K	¥4,365	-0.3%	¥1.6B ($10.5M)
2025-04-15	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	349.8K	¥3,000	+45.0%	¥231M ($1.5M)
2025-04-15	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	374.2K	¥3,000	-45.0%	¥218M ($1.4M)
2025-04-15	SELL	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	99.1K	¥3,000	-45.0%	¥2M ($15K)
2023-07-04	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	100.2K	¥2,453	+77.3%	¥246M ($1.6M)
2023-07-04	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	272.3K	¥2,453	+77.3%	¥189M ($1.2M)
2023-07-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	446.7K	¥2,453	+77.3%	¥1.1B ($7.1M)
2022-01-18	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	100.2K	¥2,340	+85.9%	¥234M ($1.5M)
2022-01-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	195.5K	¥2,340	+85.9%	¥27M ($173K)
2022-01-18	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	446.7K	¥2,340	-85.9%	¥234M ($1.5M)
2021-11-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	184.4K	¥2,276	+91.1%	¥106M ($684K)
2021-11-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	546.9K	¥2,276	+91.1%	¥9M ($56K)

Frequently asked questions

Who has been buying KSK Co.,Ltd. stock?: 3 distinct investors have filed 6 disclosed large-shareholding filings in KSK Co.,Ltd. (9687), most recently on 2025-09-29. 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 KSK Co.,Ltd. have?: KSK Co.,Ltd. has 6 buy-side and 3 sell-side disclosures on record, covering ¥820M ($5.3M) in total reported value, spanning 2021-11-29 to 2025-09-29.
Where does StockDrifts get KSK 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 KSK Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.