Who has been buying Nippon Shikizai, Inc. stock?

5 distinct investors have filed 5 disclosed large-shareholding filings in Nippon Shikizai, Inc. (4920), most recently on 2026-04-15. 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 Nippon Shikizai, Inc. have?

Nippon Shikizai, Inc. has 5 buy-side and 4 sell-side disclosures on record, covering ¥642M ($4.1M) in total reported value, spanning 2021-03-19 to 2026-04-15.

Where does StockDrifts get Nippon Shikizai, Inc. 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.

Nippon Shikizai, Inc. 4920

Company

株式会社日本色材工業研究所Nippon Shikizai, Inc.

Investors

Buys

Total Value

¥642M ($4.1M)

Avg Return

+12.12%

Last Filing

2026-04-15

Nippon Shikizai, Inc. (4920) has 5 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥642M ($4.1M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Shikizai, Inc. is dated 2021-03-19; the most recent is 2026-04-15. 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 +12.12%, 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
2026-04-15	BUY	unknown	奥村浩士 Koji Okumura	other	9.0K	¥1,189	-6.9%	¥11M ($69K)
2026-04-15	BUY	negotiated	株式会社トワ・スール Trois soeurs Inc.	activist	719.6K	¥1,189	-6.9%	¥262M ($1.7M)
2026-04-15	BUY	unknown	奥村浩士 Koji Okumura	other	9.0K	¥1,189	-6.9%	¥290M ($1.9M)
2026-04-15	BUY	negotiated	株式会社トワ・スール Trois soeurs Inc.	activist	719.6K	¥1,189	-6.9%	¥262M ($1.7M)
2022-06-03	BUY	negotiated	株式会社トワ・スール Trois soeure Inc.	activist	499.6K	¥1,019	+15.6%	¥509M ($3.3M)
2022-06-03	BUY	negotiated	株式会社トワ・スール Trois soeure Inc.	activist	499.6K	¥1,019	+15.6%	¥509M ($3.3M)
2022-06-03	BUY	negotiated	奥村華代 Kayo Okumura	activist	89.9K	¥1,019	+15.6%	¥92M ($591K)
2022-06-03	BUY	negotiated	奥村華代 Kayo Okumura	activist	89.9K	¥1,019	+15.6%	¥92M ($591K)
2022-06-01	BUY	negotiated	奥村華代 Kayo Okumura	activist	89.9K	¥1,008	+16.9%	¥91M ($585K)
2022-06-01	BUY	unknown	奥村浩士 Hiroshi Okumura	other	253.0K	¥1,008	+16.9%	¥255M ($1.6M)
2022-06-01	BUY	negotiated	株式会社トワ・スール Trois soeure Inc.	activist	499.6K	¥1,008	+16.9%	¥504M ($3.2M)
2022-06-01	SELL	unknown	株式会社キャトル・セゾン quatre saisons	other	336	¥1,008	-16.9%	¥5M ($30K)
2022-06-01	BUY	unknown	株式会社キャトル・セゾン quatre saisons	other	336	¥1,008	+16.9%	¥37M ($241K)
2022-06-01	BUY	negotiated	株式会社トワ・スール Trois soeure Inc.	activist	499.6K	¥1,008	+16.9%	¥504M ($3.2M)
2021-04-21	SELL	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	96.6K	¥1,195	+1.4%	¥25M ($162K)
2021-04-06	SELL	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	117.6K	¥1,199.471	+1.8%	¥32M ($210K)
2021-03-19	SELL	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	144.6K	¥1,198.522	+1.7%	¥35M ($226K)

Frequently asked questions

Who has been buying Nippon Shikizai, Inc. stock?: 5 distinct investors have filed 5 disclosed large-shareholding filings in Nippon Shikizai, Inc. (4920), most recently on 2026-04-15. 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 Nippon Shikizai, Inc. have?: Nippon Shikizai, Inc. has 5 buy-side and 4 sell-side disclosures on record, covering ¥642M ($4.1M) in total reported value, spanning 2021-03-19 to 2026-04-15.
Where does StockDrifts get Nippon Shikizai, Inc. 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 Nippon Shikizai, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.