Who has been buying CSS Holdings,Ltd. stock?

13 distinct investors have filed 26 disclosed large-shareholding filings in CSS Holdings,Ltd. (2304), most recently on 2026-03-12. 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 CSS Holdings,Ltd. have?

CSS Holdings,Ltd. has 26 buy-side and 13 sell-side disclosures on record, covering ¥1.3B ($8.2M) in total reported value, spanning 2021-07-06 to 2026-03-12.

Where does StockDrifts get CSS Holdings,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.

CSS Holdings,Ltd. 2304

Company

株式会社CSSホールディングスCSS Holdings,Ltd.

Investors

Buys

Total Value

¥1.3B ($8.2M)

Avg Return

+219.99%

Last Filing

2026-03-12

CSS Holdings,Ltd. (2304) has 26 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥1.3B ($8.2M) in reported transaction value. The earliest filing StockDrifts holds for CSS Holdings,Ltd. is dated 2021-07-06; the most recent is 2026-03-12. 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 +219.99%, 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
2026-03-12	BUY	Market Buy	野口凛	strategic	671.0K	¥964	-2.7%	¥629M ($4.1M)
2026-03-12	BUY	Market Buy	野口優	strategic	677.0K	¥964	-2.7%	¥635M ($4.1M)
2026-03-12	BUY	Market Buy	野口緑	strategic	613.3K	¥964	-2.7%	¥575M ($3.7M)
2023-05-19	SELL	Market Buy	Oakキャピタル株式会社 Oak Capital Corporation	passive	0	¥698	-34.4%	¥419M ($2.7M)
2023-05-18	BUY	Market Buy	株式会社ユニヴァ・アセット・マネジメント UNIVA Asset Management Limited	passive	600.0K	¥710	+32.1%	¥426M ($2.7M)
2022-08-01	BUY	negotiated	D・TEC株式会社 D・TEC Co., Ltd.	strategic	7.0K	¥284	+230.3%	¥2M ($13K)
2022-08-01	BUY	negotiated	C-TEC株式会社 C-TEC Co., Ltd.	strategic	8.1K	¥284	+230.3%	¥2M ($15K)
2022-08-01	BUY	negotiated	B・TEC株式会社 B・TEC Co., Ltd.	strategic	8.5K	¥284	+230.3%	¥2M ($16K)
2022-08-01	BUY	negotiated	白土将敏 Masatoshi Shirato	strategic	202.0K	¥284	+230.3%	¥40M ($257K)
2022-08-01	BUY	negotiated	S・TEC株式会社 S TEC Co.,Ltd.	strategic	451.4K	¥284	+230.3%	¥128M ($827K)
2022-06-06	BUY	unknown	野口凛 Rin Noguchi	strategic	671.0K	¥258	+263.6%	¥173M ($1.1M)
2022-06-06	BUY	unknown	野口優 Yu Noguchi	strategic	677.0K	¥258	+263.6%	¥175M ($1.1M)
2022-06-06	BUY	unknown	野口凛 Rin Noguchi	strategic	671.0K	¥258	+263.6%	¥173M ($1.1M)
2022-06-06	BUY	unknown	野口優 Yu Noguchi	strategic	677.0K	¥258	+263.6%	¥175M ($1.1M)
2022-06-06	SELL	unknown	野口緑 Noguchi Midori	strategic	609.4K	¥258	-263.6%	¥171M ($1.1M)
2022-06-06	SELL	unknown	野口緑 Noguchi Midori	strategic	609.4K	¥258	-263.6%	¥171M ($1.1M)
2022-06-02	BUY	negotiated	C-TEC株式会社 C-TEC Co., Ltd.	strategic	8.1K	¥259	+262.2%	¥2M ($13K)
2022-06-02	BUY	negotiated	D・TEC株式会社 D・TEC Co., Ltd.	strategic	7.0K	¥259	+262.2%	¥2M ($11K)
2022-06-02	SELL	negotiated	B・TEC株式会社 B・TEC Co., Ltd.	strategic	8.5K	¥259	-262.2%	¥94M ($604K)
2022-06-02	BUY	negotiated	白土将敏 Masatoshi Shirato	strategic	62.0K	¥259	+262.2%	¥13M ($83K)
2022-06-02	BUY	negotiated	D・TEC株式会社 D・TEC Co., Ltd.	strategic	7.0K	¥259	+262.2%	¥2M ($11K)
2022-06-02	BUY	negotiated	C-TEC株式会社 C-TEC Co., Ltd.	strategic	8.1K	¥259	+262.2%	¥2M ($13K)
2022-06-02	SELL	negotiated	B・TEC株式会社 B・TEC Co., Ltd.	strategic	8.5K	¥259	-262.2%	¥94M ($604K)
2022-06-02	BUY	negotiated	白土将敏 Masatoshi Shirato	strategic	62.0K	¥259	+262.2%	¥13M ($83K)
2022-06-02	BUY	block_purchase	D・TEC株式会社 D・TEC Co., Ltd.	strategic	7.0K	¥259	+262.2%	¥2M ($11K)
2022-06-02	BUY	block_purchase	C-TEC株式会社 C-TEC Co., Ltd.	strategic	8.1K	¥259	+262.2%	¥2M ($13K)
2022-06-02	SELL	block_purchase	B・TEC株式会社 B・TEC Co., Ltd.	strategic	8.5K	¥259	-262.2%	¥94M ($604K)
2022-06-02	BUY	block_purchase	白土将敏 Masatoshi Shirato	strategic	62.0K	¥259	+262.2%	¥13M ($83K)
2022-06-02	BUY	block_purchase	S・TEC株式会社 S TEC Co.,Ltd.	strategic	451.4K	¥259	+262.2%	¥411K ($3K)
2022-06-02	BUY	negotiated	S・TEC株式会社 S TEC Co.,Ltd.	strategic	451.4K	¥259	+262.2%	¥411K ($3K)
2022-06-02	BUY	negotiated	S・TEC株式会社 S TEC Co.,Ltd.	strategic	451.4K	¥259	+262.2%	¥411K ($3K)
2022-01-14	BUY	unknown	野口優 Yu Noguchi	strategic	677.0K	¥263	+256.6%	¥178M ($1.1M)
2022-01-14	BUY	unknown	野口緑 Noguchi Midori	strategic	1.3M	¥263	+256.6%	¥336M ($2.2M)
2021-12-15	SELL	unknown	野口緑 Noguchi Midori	strategic	1.3M	¥278	-237.4%	¥171M ($1.1M)
2021-12-15	BUY	unknown	野口優 Yu Noguchi	strategic	677.0K	¥278	+237.4%	¥6M ($41K)
2021-12-07	BUY	Market Buy	Oakキャピタル株式会社 Oak Capital Corporation	passive	600.0K	¥262	+258.0%	¥157M ($1.0M)
2021-09-22	BUY	unknown	野口優 Yu Noguchi	strategic	654.0K	¥267	+251.3%	¥175M ($1.1M)
2021-09-22	SELL	unknown	野口緑 Noguchi Midori	strategic	2.0M	¥267	-251.3%	¥173M ($1.1M)
2021-09-14	BUY	Market Buy	auカブコム証券株式会社 Mitsubishi UFJ Financial Group Inc.	other	5.7K	¥276	+239.9%	¥2M ($10K)
2021-09-14	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.3M	¥276	+239.9%	¥24M ($156K)
2021-09-13	BUY	Market Buy	B・TEC株式会社 B・TEC Co., Ltd.	strategic	3.6K	¥261	+259.4%	¥940K ($6K)
2021-09-13	SELL	Market Buy	白土将敏 Masatoshi Shirato	strategic	12.0K	¥261	-259.4%	¥38M ($247K)
2021-09-13	BUY	Market Buy	S・TEC株式会社 S TEC Co.,Ltd.	strategic	449.9K	¥261	+259.4%	¥10M ($68K)
2021-08-26	SELL	negotiated	白土将敏 Masatoshi Shirato	strategic	12.0K	¥257	-265.0%	¥38M ($243K)
2021-08-26	BUY	negotiated	C-TEC株式会社 C-TEC Co., Ltd.	strategic	2.5K	¥257	+265.0%	¥643K ($4K)
2021-08-26	BUY	negotiated	C-TEC株式会社 C-TEC Co., Ltd.	strategic	2.5K	¥257	+265.0%	¥643K ($4K)
2021-08-26	SELL	negotiated	白土将敏 Masatoshi Shirato	strategic	12.0K	¥257	-265.0%	¥38M ($243K)
2021-08-26	BUY	Market Buy	D・TEC株式会社 D・TEC Co., Ltd.	unknown	7.5K	¥257	+265.0%	¥2M ($12K)
2021-08-26	BUY	Market Buy	C-TEC株式会社 C-TEC Co., Ltd.	unknown	8.1K	¥257	+265.0%	¥2M ($13K)
2021-08-26	BUY	Market Buy	S・TEC株式会社 S TEC Co.,Ltd.	strategic	451.4K	¥257	+265.0%	¥11M ($69K)

Showing the 50 most recent of 55 filings.

Frequently asked questions

Who has been buying CSS Holdings,Ltd. stock?: 13 distinct investors have filed 26 disclosed large-shareholding filings in CSS Holdings,Ltd. (2304), most recently on 2026-03-12. 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 CSS Holdings,Ltd. have?: CSS Holdings,Ltd. has 26 buy-side and 13 sell-side disclosures on record, covering ¥1.3B ($8.2M) in total reported value, spanning 2021-07-06 to 2026-03-12.
Where does StockDrifts get CSS Holdings,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 CSS Holdings,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.