Who has been buying Komaihaltec Inc. stock?

4 distinct investors have filed 4 disclosed large-shareholding filings in Komaihaltec Inc. (5915), most recently on 2026-05-01. 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 Komaihaltec Inc. have?

Komaihaltec Inc. has 4 buy-side and 1 sell-side disclosures on record, covering ¥137M ($884K) in total reported value, spanning 2022-09-02 to 2026-05-01.

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.

Komaihaltec Inc. 5915

Company

株式会社駒井ハルテックKomaihaltec Inc.

Investors

Buys

Total Value

¥137M ($884K)

Avg Return

-2.17%

Last Filing

2026-05-01

Komaihaltec Inc. (5915) has 4 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥137M ($884K) in reported transaction value. The earliest filing StockDrifts holds for Komaihaltec Inc. is dated 2022-09-02; the most recent is 2026-05-01. Across these filings the average return since disclosure is -2.17%, 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
2026-07-06	BUY	Market Buy	ソンユウニン(Sun You Ning) Sun You Ning	engagement	510.2K	¥2,312	+5.9%	¥95M ($616K)
2026-05-25	BUY	Market Buy	ソンユウニン(Sun You Ning) Sun You Ning	engagement	468.7K	¥2,152	+13.8%	¥109M ($704K)
2026-05-01	BUY	Market Buy	ソンユウニン(Sun You Ning) Sun You Ning	engagement	418.2K	¥2,623	-6.7%	¥137M ($884K)
2026-04-24	BUY	Market Buy	ソンユウニン(Sun You Ning) Sun You Ning	engagement	365.8K	¥2,835	-13.7%	¥154M ($991K)
2026-04-17	BUY	Market Buy	ソンユウニン(Sun You Ning) Sun You Ning	engagement	311.9K	¥2,559	-4.3%	¥159M ($1.0M)
2026-04-08	BUY	Market Buy	ソンユウニン(Sun You Ning) Sun You Ning	engagement	249.8K	¥2,131	+14.9%	¥532M ($3.4M)
2022-11-09	SELL	negotiated	JFEスチール株式会社 JFE Steel Corporation	strategic	60.9K	¥1,564	-56.5%	¥79M ($512K)
2022-11-09	BUY	negotiated	JFE商事鉄鋼建材株式会社 JFE Shoji Steel Construction Materials Co., Ltd.	strategic	140.0K	¥1,564	-	-
2022-11-09	BUY	negotiated	JFE鋼材株式会社 JFE Steel Corporation	strategic	14.1K	¥1,564	-	-
2022-09-02	BUY	negotiated	JFEスチール株式会社 JFE Steel Corporation	strategic	111.8K	¥1,659	-	-
2022-09-02	BUY	negotiated	JFE商事鉄鋼建材株式会社 JFE Shoji Steel Construction Materials Co., Ltd.	strategic	140.0K	¥1,659	-	-
2022-09-02	BUY	negotiated	JFE鋼材株式会社 JFE Steel Corporation	strategic	14.1K	¥1,659	-	-

Frequently asked questions

Who has been buying Komaihaltec Inc. stock?: 4 distinct investors have filed 4 disclosed large-shareholding filings in Komaihaltec Inc. (5915), most recently on 2026-05-01. 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 Komaihaltec Inc. have?: Komaihaltec Inc. has 4 buy-side and 1 sell-side disclosures on record, covering ¥137M ($884K) in total reported value, spanning 2022-09-02 to 2026-05-01.
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.