Who has been buying Nippon Gas Co., Ltd. stock?

16 distinct investors have filed 19 disclosed large-shareholding filings in Nippon Gas Co., Ltd. (8174), most recently on 2026-05-12. 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 Gas Co., Ltd. have?

Nippon Gas Co., Ltd. has 19 buy-side and 6 sell-side disclosures on record, covering ¥25.8B ($166.5M) in total reported value, spanning 2021-05-20 to 2026-05-12.

Where does StockDrifts get Nippon Gas Co., Ltd. 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 Gas Co., Ltd. 8174

Company

日本瓦斯株式会社Nippon Gas Co., Ltd.

Investors

Buys

Total Value

¥25.8B ($166.5M)

Avg Return

+34.07%

Last Filing

2026-05-12

Nippon Gas Co., Ltd. (8174) has 19 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 16 distinct investors. Together those filings cover ¥25.8B ($166.5M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Gas Co., Ltd. is dated 2021-05-20; the most recent is 2026-05-12. 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 +34.07%, 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
2026-05-12	BUY	unknown	野村アセットマネジメント株式会社	other	5.5M	¥2,769.5	-3.2%	¥15.2B ($98.3M)
2026-05-12	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	232.4K	¥2,769.5	-3.2%	¥644M ($4.2M)
2025-11-05	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	265.3K	¥2,926.5	-1.1%	¥776M ($5.0M)
2025-11-05	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	2.3M	¥2,926.5	-1.1%	¥6.8B ($43.8M)
2025-11-05	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	1.2M	¥2,926.5	-1.1%	¥3.6B ($23.0M)
2025-11-05	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	1.5M	¥2,926.5	-1.1%	¥4.4B ($28.3M)
2025-11-05	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	192.1K	¥2,926.5	-1.1%	¥562M ($3.6M)
2025-11-05	BUY	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク(BlackRock Financial Management BlackRock Financial Management, Inc.	passive	219.9K	¥2,926.5	-1.1%	¥644M ($4.2M)
2025-09-19	SELL	unknown	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	2.8M	¥2,842	-1.8%	¥32M ($207K)
2025-09-19	SELL	unknown	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	3.9M	¥2,842	-1.8%	¥2.2B ($14.1M)
2023-08-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.5M	¥2,090.5	+38.4%	¥9.2B ($59.3M)
2023-08-07	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	33.5K	¥2,090.5	+38.4%	¥6.6B ($42.6M)
2023-08-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	262.2K	¥2,090.5	+38.4%	¥386M ($2.5M)
2022-09-06	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.9M	¥2,129	+35.9%	¥596M ($3.8M)
2022-09-06	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	4.9M	¥2,129	+35.9%	¥2.0B ($13.0M)
2021-10-07	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	5.6M	¥1,472	+96.5%	¥8.2B ($52.9M)
2021-10-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	306.6K	¥1,472	+96.5%	¥451M ($2.9M)
2021-10-07	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	84.2K	¥1,472	+96.5%	¥124M ($800K)
2021-10-04	SELL	Market Buy	カバウター・マネージメント・エルエルシー (Kabouter Management, LLC) Kabouter Management, LLC	passive	4.7M	¥1,514	-91.1%	¥2.1B ($13.8M)
2021-06-21	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	17.0K	¥1,770	+63.5%	¥1.3B ($8.1M)
2021-06-21	BUY	unknown	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥1,770	+63.5%	¥294M ($1.9M)
2021-06-21	SELL	unknown	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.7M	¥1,770	-63.5%	¥966M ($6.2M)
2021-06-21	SELL	unknown	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	other	482.8K	¥1,770	-63.5%	¥903M ($5.8M)
2021-05-20	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.7M	¥1,881	+53.8%	¥2.4B ($15.4M)
2021-05-20	SELL	unknown	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	4.0M	¥1,881	-53.8%	¥1.4B ($8.8M)

Frequently asked questions

Who has been buying Nippon Gas Co., Ltd. stock?: 16 distinct investors have filed 19 disclosed large-shareholding filings in Nippon Gas Co., Ltd. (8174), most recently on 2026-05-12. 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 Gas Co., Ltd. have?: Nippon Gas Co., Ltd. has 19 buy-side and 6 sell-side disclosures on record, covering ¥25.8B ($166.5M) in total reported value, spanning 2021-05-20 to 2026-05-12.
Where does StockDrifts get Nippon Gas Co., Ltd. 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 Gas Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.