Who has been buying CS-C.Co.,Ltd. stock?

8 distinct investors have filed 12 disclosed large-shareholding filings in CS-C.Co.,Ltd. (9258), 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 CS-C.Co.,Ltd. have?

CS-C.Co.,Ltd. has 12 buy-side and 11 sell-side disclosures on record, covering ¥2.4B ($15.4M) in total reported value, spanning 2022-01-06 to 2025-09-29.

Where does StockDrifts get CS-C.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.

CS-C.Co.,Ltd. 9258

Company

株式会社CS-CCS-C.Co.,Ltd.

Investors

Buys

Total Value

¥2.4B ($15.4M)

Avg Return

-34.31%

Last Filing

2025-09-29

CS-C.Co.,Ltd. (9258) has 12 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥2.4B ($15.4M) in reported transaction value. The earliest filing StockDrifts holds for CS-C.Co.,Ltd. is dated 2022-01-06; 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 -34.31%, 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
2025-09-29	BUY	Market Buy	株式会社EPARK EPARK , INC.	passive	104.2K	¥408	-17.6%	¥15M ($98K)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	108.0K	¥408	-17.6%	¥44M ($284K)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	511.8K	¥408	-17.6%	¥209M ($1.3M)
2025-08-08	BUY	Market Buy	株式会社EPARK EPARK , INC.	passive	66.7K	¥436	-22.9%	¥29M ($188K)
2025-08-08	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	108.0K	¥436	-22.9%	¥47M ($304K)
2025-08-08	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	511.8K	¥436	-22.9%	¥223M ($1.4M)
2025-03-07	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	108.0K	¥409	-17.9%	¥28M ($178K)
2025-03-07	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	511.8K	¥409	+17.9%	¥2M ($14K)
2024-12-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	511.8K	¥340	-1.2%	¥13M ($83K)
2024-12-06	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	40.2K	¥340	-1.2%	¥14M ($88K)
2024-11-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	474.4K	¥371	-9.4%	¥25M ($160K)
2024-08-23	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	407.6K	¥427	-21.3%	¥33M ($213K)
2024-08-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	330.4K	¥367	-8.4%	¥121M ($782K)
2024-02-20	SELL	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥409	+17.9%	¥5M ($31K)
2024-02-20	SELL	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥409	+17.9%	¥2M ($14K)
2023-10-03	SELL	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	306.8K	¥388	+13.4%	¥48M ($309K)
2023-06-19	SELL	Market Buy	明治安田アセットマネジメント株式会社 Meiji Yasuda Asset Management Company Ltd.	passive	151.9K	¥623	+46.1%	¥134M ($864K)
2023-04-18	BUY	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	430.2K	¥567	-40.7%	¥45M ($289K)
2023-03-08	BUY	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥560	-40.0%	¥758M ($4.9M)
2023-03-08	BUY	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥560	-40.0%	¥1.7B ($10.8M)
2022-12-28	BUY	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥508	-33.9%	¥1.5B ($9.8M)
2022-12-28	BUY	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥508	-33.9%	¥1.5B ($9.8M)
2022-12-28	BUY	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥508	-33.9%	¥687M ($4.4M)
2022-12-28	BUY	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥508	-33.9%	¥687M ($4.4M)
2022-12-27	SELL	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥522	+35.6%	¥81M ($522K)
2022-12-27	SELL	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥522	+35.6%	¥49M ($314K)
2022-12-27	SELL	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥522	+35.6%	¥49M ($314K)
2022-12-27	SELL	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥522	+35.6%	¥81M ($522K)
2022-12-27	SELL	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥522	+35.6%	¥49M ($314K)
2022-12-06	BUY	Market Buy	明治安田アセットマネジメント株式会社 Meiji Yasuda Asset Management Company Ltd.	passive	367.0K	¥538	-37.5%	¥197M ($1.3M)
2022-06-02	BUY	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	348.4K	¥664	-49.4%	¥231M ($1.5M)
2022-03-01	SELL	unknown	税理士法人NY Accounting Partners Tax accountant corporation NY Accounting Partners	unknown	0	¥540	+37.8%	¥261M ($1.7M)
2022-01-06	BUY	unknown	株式会社スマイルプラス Smile Plus Co., Ltd.	activist	3.0M	¥1,098	-69.4%	¥3.3B ($21.3M)
2022-01-06	BUY	unknown	椙原健 Takeshi Suginohara	activist	1.4M	¥1,098	-69.4%	¥1.5B ($9.7M)
2022-01-06	BUY	subscription	税理士法人NY Accounting Partners Tax accountant corporation NY Accounting Partners	activist	500.0K	¥1,098	-69.4%	¥549M ($3.5M)

Frequently asked questions

Who has been buying CS-C.Co.,Ltd. stock?: 8 distinct investors have filed 12 disclosed large-shareholding filings in CS-C.Co.,Ltd. (9258), 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 CS-C.Co.,Ltd. have?: CS-C.Co.,Ltd. has 12 buy-side and 11 sell-side disclosures on record, covering ¥2.4B ($15.4M) in total reported value, spanning 2022-01-06 to 2025-09-29.
Where does StockDrifts get CS-C.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 CS-C.Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.