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Koatsu Kogyo Co.,Ltd. 1743

Company
コーアツ工業株式会社Koatsu Kogyo Co.,Ltd.
Investors
7
Buys
7
Total Value
¥307M ($2.0M)
Avg Return
+11.57%
Last Filing
2025-09-19

Koatsu Kogyo Co.,Ltd. (1743) has 7 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥307M ($2.0M) in reported transaction value. The earliest filing StockDrifts holds for Koatsu Kogyo Co.,Ltd. is dated 2022-01-06; the most recent is 2025-09-19. Across these filings the average return since disclosure is +11.57%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-09-19BUYunknown
株式会社ウエムラ
Uemura Co., Ltd.
activist1.2M¥1,820+0.1%¥2.2B ($14.3M)
2025-09-19SELLunknown
コーアツ工業共栄会 理事長 水迫繁一
Koatsu Kogyo's Kyoeikai Assn, Shigeichi Mizusoko
unknown0¥1,820-0.1%¥337M ($2.2M)
2025-09-19BUYunknown
株式会社植村組
UEMURAGUMI
other203.7K¥1,820+0.1%-
2025-09-19BUYunknown
株式会社ガイアテック
GAIATEC
strategic203.6K¥1,820+0.1%-
2025-09-19BUYunknown
株式会社南日本運輸建設
MINAMINIHONUNYUKENSETSU
other148.4K¥1,820+0.1%-
2025-09-19BUYunknown
株式会社日本地下技術
NIHONCHIKAGIJUTSU
other127.4K¥1,820+0.1%-
2025-09-09BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic678.8K¥1,836--
2025-09-09BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic203.6K¥1,836--
2025-09-05BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic678.8K¥1,839--
2025-08-21BUYunknown
株式会社南日本運輸建設
MINAMINIHONUNYUKENSETSU
other148.4K¥1,842--
2025-08-21BUYunknown
株式会社植村組
UEMURAGUMI
other203.7K¥1,842--
2025-08-21BUYunknown
株式会社日本地下技術
NIHONCHIKAGIJUTSU
other127.4K¥1,842--
2025-08-12BUYunknown
株式会社植村組
UEMURAGUMI
other67.9K¥1,852--
2025-08-12BUYunknown
株式会社植村組
UEMURAGUMI
other1.1M¥1,852--
2025-08-12BUYunknown
株式会社植村組
UEMURAGUMI
other112.9K¥1,852--
2025-08-12BUYunknown
株式会社植村組
UEMURAGUMI
other67.9K¥1,852-¥83M ($538K)
2025-08-12BUYunknown
株式会社植村組
UEMURAGUMI
other203.7K¥1,852--
2025-08-12BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic203.6K¥1,852--
2025-08-12BUYunknown
株式会社日本地下技術
NIHONCHIKAGIJUTSU
other42.5K¥1,852-¥79M ($508K)
2025-08-12BUYunknown
株式会社日本地下技術
NIHONCHIKAGIJUTSU
other127.4K¥1,852--
2025-08-12BUYunknown
株式会社南日本運輸建設
MINAMINIHONUNYUKENSETSU
other49.5K¥1,852-¥92M ($591K)
2025-08-12BUYunknown
株式会社南日本運輸建設
MINAMINIHONUNYUKENSETSU
other148.4K¥1,852--
2025-08-12BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic678.8K¥1,852--
2025-08-12BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic203.6K¥1,852--
2025-08-12BUYnegotiated
株式会社ガイアテック
GAIATEC
strategic678.8K¥1,852--
2025-07-29BUYMarket Buy
コーアツ工業共栄会 理事長 水迫繁一
Koatsu Kogyo's Kyoeikai Assn, Shigeichi Mizusoko
strategic184.8K¥1,631+11.7%¥37M ($240K)
2022-08-17SELLunknown
松澤孝一
KOICHI MATSUZAWA
other26.2K¥1,803.33-1.0%¥84M ($539K)
2022-01-06BUYMarket Buy
コーアツ工業共栄会 理事長 石堂和雄
Koatsu Kogyo's Kyoeikai Assn, Kazuo Ishido
strategic54.0K¥1,080+68.7%¥9M ($57K)

Frequently asked questions

Who has been buying Koatsu Kogyo Co.,Ltd. stock?
7 distinct investors have filed 7 disclosed large-shareholding filings in Koatsu Kogyo Co.,Ltd. (1743), most recently on 2025-09-19. 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 Koatsu Kogyo Co.,Ltd. have?
Koatsu Kogyo Co.,Ltd. has 7 buy-side and 2 sell-side disclosures on record, covering ¥307M ($2.0M) in total reported value, spanning 2022-01-06 to 2025-09-19.
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.