Who has been buying Weathernews Inc. stock?

11 distinct investors have filed 17 disclosed large-shareholding filings in Weathernews Inc. (4825), most recently on 2026-03-06. 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 Weathernews Inc. have?

Weathernews Inc. has 17 buy-side and 11 sell-side disclosures on record, covering ¥1.2B ($7.9M) in total reported value, spanning 2021-06-21 to 2026-03-06.

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.

Weathernews Inc. 4825

Company

株式会社ウェザーニューズWeathernews Inc.

Investors

Buys

Total Value

¥1.2B ($7.9M)

Avg Return

+41.81%

Last Filing

2026-03-06

Weathernews Inc. (4825) has 17 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥1.2B ($7.9M) in reported transaction value. The earliest filing StockDrifts holds for Weathernews Inc. is dated 2021-06-21; the most recent is 2026-03-06. Across these filings the average return since disclosure is +41.81%, 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
2026-03-06	SELL	unknown	みずほ証券株式会社	other	16.2K	¥2,109	+5.0%	¥140M ($902K)
2026-03-06	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	unknown	0	¥2,109	+5.0%	¥649M ($4.2M)
2026-03-06	SELL	unknown	アセットマネジメントOne株式会社	other	1.7M	¥2,109	+5.0%	¥649M ($4.2M)
2024-11-08	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	512.2K	¥1,532.5	+30.7%	¥785M ($5.1M)
2024-11-08	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	19.6K	¥1,532.5	+30.7%	¥30M ($194K)
2024-11-08	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	77.1K	¥1,532.5	+30.7%	¥118M ($762K)
2024-11-05	SELL	unknown	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	unknown	0	¥1,485	-34.9%	¥535M ($3.4M)
2024-11-05	SELL	unknown	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	107.6K	¥1,485	-34.9%	¥60M ($386K)
2024-11-05	BUY	unknown	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	30.7K	¥1,485	+34.9%	¥2M ($11K)
2024-11-05	BUY	unknown	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	139.0K	¥1,485	+34.9%	¥86M ($556K)
2024-10-22	BUY	unknown	一般財団法人 WNI気象文化創造センター WNI WxBunka Foundation	other	1.7M	¥1,432.5	-	-
2024-10-22	BUY	Market Buy	株式会社ダブリュー・エヌ・アイ・インスティテュート WNI INSTITUTE INC.	other	1.7M	¥1,432.5	-	-
2024-10-22	BUY	Market Buy	石橋知博 Tomohiro Ishibashi	strategic	170.5K	¥1,432.5	+39.8%	¥2M ($11K)
2024-10-21	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	147.8K	¥1,430	+40.1%	¥211M ($1.4M)
2024-10-21	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	360.0K	¥1,430	+40.1%	¥515M ($3.3M)
2024-10-21	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	29.8K	¥1,430	+40.1%	¥43M ($275K)
2024-10-21	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	80.4K	¥1,430	+40.1%	¥115M ($742K)
2023-12-18	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	35.9K	¥1,352.5	+48.1%	¥10M ($62K)
2023-12-18	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	120.0K	¥1,352.5	+48.1%	¥2M ($10K)
2023-12-18	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	360.0K	¥1,352.5	-	-
2023-12-18	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	1.1K	¥1,352.5	-48.1%	¥3M ($21K)
2023-10-30	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	360.0K	¥1,447.5	-	-
2023-10-30	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	118.9K	¥1,447.5	-38.4%	¥125M ($807K)
2023-10-30	SELL	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	28.6K	¥1,447.5	-38.4%	¥5M ($33K)
2023-10-30	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	121.1K	¥1,447.5	-	¥175M ($1.1M)
2023-06-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	447.4K	¥1,677.5	+19.4%	¥742M ($4.8M)
2023-06-07	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	42.8K	¥1,677.5	+19.4%	¥8M ($51K)
2023-03-03	BUY	unknown	株式会社ダブリュー・エヌ・アイ・インスティテュート WNI INSTITUTE INC.	other	1.7M	¥1,680	-	-
2023-03-03	BUY	unknown	石橋知博 Tomohiro Ishibashi	strategic	169.0K	¥1,680	-	-
2023-01-06	BUY	unknown	株式会社ダブリュー・エヌ・アイ・インスティテュート WNI INSTITUTE INC.	other	1.7M	¥1,705	-	-
2023-01-06	BUY	unknown	石橋知博 Tomohiro Ishibashi	strategic	169.0K	¥1,705	-	¥288M ($1.9M)
2022-10-21	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	567.5K	¥1,832.5	+9.3%	¥1.0B ($6.7M)
2022-10-21	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	37.7K	¥1,832.5	+9.3%	¥69M ($446K)
2021-06-21	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	360.0K	¥1,370	-	-
2021-06-21	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	204.4K	¥1,370	-46.2%	¥104M ($670K)
2021-06-21	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	9.4K	¥1,370	-46.2%	¥41M ($262K)
2021-06-21	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	32.5K	¥1,370	+46.2%	¥13M ($84K)
2021-06-21	SELL	negotiated	auカブコム証券株式会社 Mitsubishi UFJ Financial Group Inc.	other	9.8K	¥1,370	-46.2%	¥6M ($42K)

Frequently asked questions

Who has been buying Weathernews Inc. stock?: 11 distinct investors have filed 17 disclosed large-shareholding filings in Weathernews Inc. (4825), most recently on 2026-03-06. 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 Weathernews Inc. have?: Weathernews Inc. has 17 buy-side and 11 sell-side disclosures on record, covering ¥1.2B ($7.9M) in total reported value, spanning 2021-06-21 to 2026-03-06.
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.