Who has been buying Matsumoto Yushi-Seiyaku Co.,Ltd. stock?

11 distinct investors have filed 3 disclosed large-shareholding filings in Matsumoto Yushi-Seiyaku Co.,Ltd. (4365), most recently on 2026-05-13. 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 Matsumoto Yushi-Seiyaku Co.,Ltd. have?

Matsumoto Yushi-Seiyaku Co.,Ltd. has 3 buy-side and 13 sell-side disclosures on record, covering ¥4.0B ($26.1M) in total reported value, spanning 2021-12-15 to 2026-05-13.

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.

Matsumoto Yushi-Seiyaku Co.,Ltd. 4365

Company

松本油脂製薬株式会社Matsumoto Yushi-Seiyaku Co.,Ltd.

Investors

Buys

Total Value

¥4.0B ($26.1M)

Avg Return

+58.38%

Last Filing

2026-05-13

Matsumoto Yushi-Seiyaku Co.,Ltd. (4365) has 3 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥4.0B ($26.1M) in reported transaction value. The earliest filing StockDrifts holds for Matsumoto Yushi-Seiyaku Co.,Ltd. is dated 2021-12-15; the most recent is 2026-05-13. Across these filings the average return since disclosure is +58.38%, 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
2026-05-13	BUY	negotiated	木村直樹	activist	133.2K	¥19,700	-	¥2.6B ($16.9M)
2026-05-13	BUY	Market Buy	松本興産株式会社	strategic	681.8K	¥19,700	+19.3%	¥89M ($574K)
2025-02-27	BUY	negotiated	木村直樹 Naoki Kimura	activist	133.2K	¥18,200	-	-
2025-02-27	BUY	negotiated	木村惠子 Keiko Kimura	strategic	19.4K	¥18,200	-	-
2025-02-27	SELL	negotiated	有限会社木村 Kimura Ltd.	strategic	107.9K	¥18,200	-29.1%	¥1.8B ($11.8M)
2025-02-27	BUY	negotiated	株式会社NK NK Co., Ltd.	strategic	100.0K	¥18,200	-	¥1.8B ($11.7M)
2023-05-30	SELL	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	strategic	320.6K	¥14,050	-67.3%	¥393M ($2.5M)
2023-05-30	SELL	unknown	松本新太郎 Shintaro Matsumoto	activist	123.3K	¥14,050	-67.3%	¥63M ($409K)
2023-03-30	SELL	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	unknown	169	¥14,100	-66.7%	¥4.5B ($29.1M)
2023-03-30	SELL	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	unknown	169	¥14,100	-66.7%	¥4.5B ($29.1M)
2023-03-30	SELL	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	unknown	0	¥14,100	-66.7%	¥4.9B ($31.7M)
2023-03-30	SELL	unknown	松本新太郎 Shintaro Matsumoto	unknown	0	¥14,100	-66.7%	¥1.7B ($11.2M)
2023-03-30	SELL	unknown	松本新太郎 Shintaro Matsumoto	unknown	0	¥14,100	-66.7%	¥1.7B ($11.2M)
2023-03-30	BUY	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	unknown	0	¥14,100	-	¥4.9B ($31.7M)
2023-03-29	SELL	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	unknown	0	¥14,100	-66.7%	¥6.3B ($40.7M)
2023-03-29	SELL	unknown	松栄産業株式会社 Shoei Industry Co., Ltd.	unknown	0	¥14,100	-66.7%	¥6.3B ($40.7M)
2023-03-29	SELL	unknown	松本新太郎 Shintaro Matsumoto	unknown	0	¥14,100	-66.7%	¥2.4B ($15.6M)
2023-03-29	SELL	unknown	松本新太郎 Shintaro Matsumoto	unknown	0	¥14,100	-66.7%	¥2.4B ($15.6M)
2022-09-21	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	0	¥12,380	-89.8%	¥36M ($235K)
2022-09-21	BUY	Market Buy	GLOBAL MANAGEMENT PARTNERS LIMITED Global Management Partners Limited	passive	293.5K	¥12,380	+89.8%	¥3.6B ($23.4M)
2021-12-15	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	293.6K	¥10,470	+124.5%	¥321M ($2.1M)
2021-12-15	BUY	Market Buy	株式会社鹿児島東インド会社 Kagoshima East India Inc	passive	100	¥10,470	-	¥1M ($7K)

Frequently asked questions

Who has been buying Matsumoto Yushi-Seiyaku Co.,Ltd. stock?: 11 distinct investors have filed 3 disclosed large-shareholding filings in Matsumoto Yushi-Seiyaku Co.,Ltd. (4365), most recently on 2026-05-13. 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 Matsumoto Yushi-Seiyaku Co.,Ltd. have?: Matsumoto Yushi-Seiyaku Co.,Ltd. has 3 buy-side and 13 sell-side disclosures on record, covering ¥4.0B ($26.1M) in total reported value, spanning 2021-12-15 to 2026-05-13.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.