Who has been buying Air Water Inc. stock?

7 distinct investors have filed 6 disclosed large-shareholding filings in Air Water Inc. (4088), most recently on 2025-12-04. 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 Air Water Inc. have?

Air Water Inc. has 6 buy-side and 7 sell-side disclosures on record, covering ¥26.9B ($173.3M) in total reported value, spanning 2021-08-19 to 2025-12-04.

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.

Air Water Inc. 4088

Company

エア・ウォーター株式会社Air Water Inc.

Investors

Buys

Total Value

¥26.9B ($173.3M)

Avg Return

+16.17%

Last Filing

2025-12-04

Air Water Inc. (4088) has 6 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥26.9B ($173.3M) in reported transaction value. The earliest filing StockDrifts holds for Air Water Inc. is dated 2021-08-19; the most recent is 2025-12-04. Across these filings the average return since disclosure is +16.17%, 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
2026-06-22	BUY	acquisition	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	13.9M	¥2,495	+16.7%	¥34.7B ($223.8M)
2026-05-22	BUY	unknown	株式会社シティインデックスイレブンス	activist	100	¥2,579	-	-
2026-05-22	BUY	Market Buy	野村絢	activist	12.4M	¥2,579	+12.9%	¥2.5B ($16.1M)
2026-05-22	BUY	Market Buy	株式会社ATRA	activist	2.4M	¥2,579	+12.9%	¥1.0B ($6.5M)
2026-05-22	BUY	unknown	株式会社レノ	activist	601.5K	¥2,579	-	¥1.6B ($10.0M)
2026-05-22	BUY	unknown	株式会社Mホールディングス	activist	404.5K	¥2,579	-	¥1.0B ($6.7M)
2026-05-21	BUY	negotiated	三井住友信託銀行株式会社	strategic	7.9M	¥2,546	-	-
2026-05-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	866.8K	¥2,546	-14.3%	¥10.8B ($69.4M)
2026-05-21	SELL	unknown	アモーヴァ・アセットマネジメント株式会社	unknown	0	¥2,546	-14.3%	¥11.8B ($76.2M)
2026-05-18	BUY	unknown	株式会社シティインデックスイレブンス	activist	100	¥2,302	+26.5%	¥230K ($1K)
2026-05-18	BUY	acquisition	野村絢	activist	11.5M	¥2,302	+26.5%	¥26.4B ($170.5M)
2026-05-18	BUY	unknown	株式会社ATRA	activist	2.0M	¥2,302	+26.5%	¥4.6B ($29.4M)
2025-12-04	BUY	negotiated	三井住友信託銀行株式会社	strategic	7.9M	¥2,158	-	-
2025-12-04	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社	other	5.1M	¥2,158	-34.9%	¥942M ($6.1M)
2025-12-04	SELL	negotiated	アモーヴァ・アセットマネジメント株式会社	other	4.6M	¥2,158	-34.9%	¥4.1B ($26.2M)
2025-09-19	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	7.9M	¥2,579	-	-
2025-09-19	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.5M	¥2,579	+12.9%	¥296M ($1.9M)
2025-09-19	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	6.5M	¥2,579	+12.9%	¥948M ($6.1M)
2024-08-05	SELL	unknown	マラソン・アセット・マネジメント・リミテッド(Marathon Asset Management Limited) Marathon Asset Management Limited	other	9.7M	¥1,750.5	-66.3%	¥4.1B ($26.2M)
2024-05-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	7.9M	¥2,245	-	-
2024-05-21	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.4M	¥2,245	-29.7%	¥3.6B ($23.3M)
2024-05-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	6.1M	¥2,245	-29.7%	¥1.7B ($10.6M)
2022-11-21	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	6.8M	¥1,601	-81.8%	¥4.1B ($26.3M)
2022-11-21	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.3M	¥1,601	-81.8%	¥331M ($2.1M)
2022-11-21	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.4M	¥1,601	+81.8%	¥1.3B ($8.5M)
2021-12-03	BUY	unknown	マラソン・アセット・マネジメント・リミテッド(Marathon Asset Management Limited) Marathon Asset Management Limited	other	12.0M	¥1,773	+64.2%	¥21.2B ($137.1M)
2021-08-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	7.9M	¥1,779	-	-
2021-08-19	BUY	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	7.0M	¥1,779	+63.6%	¥1.1B ($6.9M)
2021-08-19	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	6.9M	¥1,779	+63.6%	¥3.4B ($21.6M)

Frequently asked questions

Who has been buying Air Water Inc. stock?: 7 distinct investors have filed 6 disclosed large-shareholding filings in Air Water Inc. (4088), most recently on 2025-12-04. 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 Air Water Inc. have?: Air Water Inc. has 6 buy-side and 7 sell-side disclosures on record, covering ¥26.9B ($173.3M) in total reported value, spanning 2021-08-19 to 2025-12-04.
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.