Who has been buying Yasuhara Chemical Co.,Ltd. stock?

14 distinct investors have filed 15 disclosed large-shareholding filings in Yasuhara Chemical Co.,Ltd. (4957), most recently on 2026-01-13. 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 Yasuhara Chemical Co.,Ltd. have?

Yasuhara Chemical Co.,Ltd. has 15 buy-side and 16 sell-side disclosures on record, covering ¥2.4B ($15.7M) in total reported value, spanning 2021-10-22 to 2026-01-13.

Where does StockDrifts get Yasuhara Chemical 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.

Yasuhara Chemical Co.,Ltd. 4957

Company

ヤスハラケミカル株式会社Yasuhara Chemical Co.,Ltd.

Investors

Buys

Total Value

¥2.4B ($15.7M)

Avg Return

+72.38%

Last Filing

2026-01-13

Yasuhara Chemical Co.,Ltd. (4957) has 15 disclosed large-shareholding filings and 16 disclosed disposals on record, filed by 14 distinct investors. Together those filings cover ¥2.4B ($15.7M) in reported transaction value. The earliest filing StockDrifts holds for Yasuhara Chemical Co.,Ltd. is dated 2021-10-22; the most recent is 2026-01-13. 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 +72.38%, 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
2026-01-13	BUY	unknown	原田桂子	strategic	139.2K	¥1,367.32	-0.5%	¥191M ($1.2M)
2026-01-13	BUY	unknown	沖津妙子	strategic	466.2K	¥1,367.32	-0.5%	¥641M ($4.1M)
2026-01-13	BUY	unknown	沖津弘之	strategic	145.8K	¥1,367.32	-0.5%	¥200M ($1.3M)
2026-01-13	BUY	unknown	ワイエス興産有限会社	strategic	1.2M	¥1,367.32	-0.5%	¥1.7B ($11.0M)
2026-01-13	BUY	unknown	安原禎二	activist	1.2M	¥1,367.32	-0.5%	¥1.6B ($10.5M)
2026-01-13	BUY	unknown	YAHO株式会社	activist	5.2M	¥1,367.32	-0.5%	¥7.2B ($46.2M)
2025-12-23	SELL	negotiated	中銀リース株式会社	strategic	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	negotiated	株式会社中国銀行	strategic	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	unknown	ヤスハラケミカル取引先持株会理事長田中正治 SYOJI TANAKA	unknown	0	¥1,367.32	-0.5%	¥1.2B ($8.0M)
2025-12-23	SELL	unknown	中銀リース株式会社	unknown	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	unknown	株式会社中国銀行	unknown	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	unknown	中銀リース株式会社	unknown	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	unknown	株式会社中国銀行	unknown	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	unknown	中銀リース株式会社	unknown	0	¥1,367.32	-0.5%	-
2025-12-23	SELL	unknown	株式会社中国銀行	unknown	0	¥1,367.32	-0.5%	-
2025-12-18	BUY	unknown	原田桂子	strategic	139.2K	¥1,367.32	-0.5%	¥191M ($1.2M)
2025-12-18	BUY	unknown	沖津妙子	strategic	466.2K	¥1,367.32	-0.5%	¥641M ($4.1M)
2025-12-18	BUY	unknown	沖津弘之	strategic	145.8K	¥1,367.32	-0.5%	¥200M ($1.3M)
2025-12-18	BUY	unknown	ワイエス興産有限会社	strategic	1.2M	¥1,367.32	-0.5%	¥1.7B ($11.0M)
2025-12-18	BUY	unknown	安原禎二	activist	1.2M	¥1,367.32	-0.5%	¥1.6B ($10.5M)
2025-12-18	BUY	unknown	YAHO株式会社	activist	5.2M	¥1,367.32	-0.5%	¥7.2B ($46.2M)
2025-12-17	BUY	unknown	原田桂子	strategic	139.2K	¥1,367.32	+0.5%	¥191M ($1.2M)
2025-12-17	BUY	unknown	沖津妙子	strategic	466.2K	¥1,367.32	+0.5%	¥641M ($4.1M)
2025-12-17	BUY	unknown	沖津弘之	strategic	145.8K	¥1,367.32	+0.5%	¥200M ($1.3M)
2025-12-17	BUY	unknown	ワイエス興産有限会社	strategic	1.2M	¥1,367.32	+0.5%	¥1.7B ($11.0M)
2025-12-17	BUY	unknown	安原禎二	activist	1.2M	¥1,367.32	+0.5%	¥1.6B ($10.5M)
2025-12-17	BUY	unknown	YAHO株式会社	activist	5.2M	¥1,367.32	+0.5%	¥7.2B ($46.2M)
2025-11-06	BUY	Market Buy	原田桂子 Keiko Harada	strategic	139.2K	¥1,385.33	-0.8%	¥193M ($1.2M)
2025-11-06	BUY	Market Buy	沖津妙子 Taeko Okitsu	strategic	506.2K	¥1,385.33	-0.8%	¥60M ($388K)
2025-11-06	BUY	unknown	槇本通夫 Michio Makimoto	strategic	178.0K	¥1,385.33	-0.8%	¥247M ($1.6M)
2025-11-06	BUY	unknown	原田桂子 Keiko Harada	strategic	139.2K	¥1,385.33	-0.8%	¥193M ($1.2M)
2025-11-06	BUY	unknown	沖津妙子 Taeko Okitsu	strategic	506.2K	¥1,385.33	-0.8%	¥60M ($388K)
2025-11-06	SELL	unknown	沖津弘之 Hiroyuki Okitsu	strategic	145.8K	¥1,385.33	+0.8%	¥15M ($97K)
2025-11-06	BUY	unknown	有限会社マキ MAKI	strategic	403.7K	¥1,385.33	-0.8%	¥559M ($3.6M)
2025-11-06	SELL	Market Buy	沖津弘之 Hiroyuki Okitsu	strategic	145.8K	¥1,385.33	+0.8%	¥15M ($97K)
2025-11-06	SELL	unknown	安原禎二 Teiji Yasuhara	activist	1.2M	¥1,385.33	+0.8%	¥6M ($39K)
2025-11-06	SELL	unknown	ワイエス興産有限会社 YS Industries	strategic	1.2M	¥1,385.33	+0.8%	¥23M ($145K)
2024-02-15	SELL	unknown	槇本通夫 Michio Makimoto	strategic	178.0K	¥714.17	-92.4%	¥214M ($1.4M)
2024-02-15	BUY	unknown	有限会社マキ MAKI	strategic	403.7K	¥714.17	+92.4%	¥288M ($1.9M)
2023-09-15	BUY	unknown	槇本通夫 Michio Makimoto	strategic	478.0K	¥566.13	+142.7%	¥170M ($1.1M)
2023-09-15	BUY	unknown	有限会社マキ MAKI	strategic	403.7K	¥566.13	+142.7%	¥229M ($1.5M)
2023-08-08	BUY	unknown	槇本通夫 Michio Makimoto	strategic	178.0K	¥549.13	+150.2%	¥98M ($631K)
2023-08-08	BUY	unknown	槇本通夫 Michio Makimoto	strategic	478.0K	¥549.13	+150.2%	¥165M ($1.1M)
2023-08-08	BUY	unknown	有限会社マキ MAKI	strategic	403.7K	¥549.13	+150.2%	¥222M ($1.4M)
2023-08-08	BUY	unknown	有限会社マキ MAKI	strategic	403.7K	¥549.13	+150.2%	¥222M ($1.4M)
2023-02-15	SELL	unknown	敷田憲治 SHIKITA KENJI	unknown	0	¥504.12	-172.6%	¥4M ($23K)
2023-02-15	BUY	unknown	有限会社宗江 Munoe Co., Ltd.	unknown	373.7K	¥504.12	+172.6%	¥188M ($1.2M)
2022-11-11	SELL	unknown	ヤスハラケミカル株式会社 YASUHARA CHEMICAL CO.,LTD.	unknown	0	¥521.12	-163.7%	¥294M ($1.9M)
2022-10-07	BUY	negotiated	中銀リース株式会社 Chugin Lease Co., Ltd.	strategic	31.5K	¥525.12	+161.7%	¥17M ($107K)
2022-10-07	BUY	negotiated	中銀リース株式会社 Chugin Lease Co., Ltd.	strategic	31.5K	¥525.12	+161.7%	¥17M ($107K)

Showing the 50 most recent of 53 filings.

Frequently asked questions

Who has been buying Yasuhara Chemical Co.,Ltd. stock?: 14 distinct investors have filed 15 disclosed large-shareholding filings in Yasuhara Chemical Co.,Ltd. (4957), most recently on 2026-01-13. 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 Yasuhara Chemical Co.,Ltd. have?: Yasuhara Chemical Co.,Ltd. has 15 buy-side and 16 sell-side disclosures on record, covering ¥2.4B ($15.7M) in total reported value, spanning 2021-10-22 to 2026-01-13.
Where does StockDrifts get Yasuhara Chemical 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 Yasuhara Chemical Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.