Who has been buying Muromachi Chemicals Inc. stock?

5 distinct investors have filed 6 disclosed large-shareholding filings in Muromachi Chemicals Inc. (4885), most recently on 2026-04-27. 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 Muromachi Chemicals Inc. have?

Muromachi Chemicals Inc. has 6 buy-side and 5 sell-side disclosures on record, covering ¥176M ($1.1M) in total reported value, spanning 2021-08-12 to 2026-04-27.

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.

Muromachi Chemicals Inc. 4885

Company

室町ケミカル株式会社Muromachi Chemicals Inc.

Investors

Buys

Total Value

¥176M ($1.1M)

Avg Return

-11.31%

Last Filing

2026-04-27

Muromachi Chemicals Inc. (4885) has 6 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥176M ($1.1M) in reported transaction value. The earliest filing StockDrifts holds for Muromachi Chemicals Inc. is dated 2021-08-12; the most recent is 2026-04-27. Across these filings the average return since disclosure is -11.31%, 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
2026-04-27	SELL	unknown	村山哲朗 Tetsuro Murayama	activist	410.0K	¥984	+7.9%	¥197M ($1.3M)
2023-06-22	SELL	unknown	青木淳一 Junichi Aoki	strategic	335.9K	¥842	-7.6%	¥1M ($7K)
2023-02-03	SELL	unknown	村山哲朗 Tetsuro Murayama	activist	610.0K	¥765	-18.4%	¥100M ($647K)
2022-10-20	BUY	unknown	村山哲朗 Tetsuro Murayama	activist	741.0K	¥898	-	¥135M ($871K)
2022-10-20	SELL	unknown	村山哲朗 Tetsuro Murayama	activist	741.0K	¥898	-0.9%	¥135M ($871K)
2021-11-01	SELL	unknown	村山哲朗 Tetsuro Murayama	activist	891.0K	¥1,234	+26.6%	¥335M ($2.2M)
2021-08-12	BUY	Market Buy	室町機械株式会社 Muromachi Machinery Co., Ltd.	passive	58.0K	¥1,176	-23.0%	¥68M ($440K)
2021-08-12	BUY	Market Buy	大辻正高 Masataka Otsuji	unknown	75.0K	¥1,176	-23.0%	¥88M ($569K)
2021-08-12	BUY	Market Buy	穗苅久美 Kumi Hokari	unknown	75.0K	¥1,176	-23.0%	¥88M ($569K)
2021-08-12	BUY	unknown	大辻正高 Masataka Otsuji	other	75.0K	¥1,176	-23.0%	¥88M ($569K)
2021-08-12	BUY	unknown	穗苅久美 Kumi Hokari	other	75.0K	¥1,176	-23.0%	¥88M ($569K)
2021-08-12	BUY	unknown	室町機械株式会社 Muromachi Machinery Co., Ltd.	other	58.0K	¥1,176	-23.0%	¥68M ($440K)

Frequently asked questions

Who has been buying Muromachi Chemicals Inc. stock?: 5 distinct investors have filed 6 disclosed large-shareholding filings in Muromachi Chemicals Inc. (4885), most recently on 2026-04-27. 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 Muromachi Chemicals Inc. have?: Muromachi Chemicals Inc. has 6 buy-side and 5 sell-side disclosures on record, covering ¥176M ($1.1M) in total reported value, spanning 2021-08-12 to 2026-04-27.
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.