Who has been buying Inpex Corporation stock?

16 distinct investors have filed 28 disclosed large-shareholding filings in Inpex Corporation (1605), most recently on 2025-10-03. 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 Inpex Corporation have?

Inpex Corporation has 28 buy-side and 17 sell-side disclosures on record, covering ¥691.6B ($4.5B) in total reported value, spanning 2021-03-19 to 2025-10-03.

Where does StockDrifts get Inpex Corporation 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.

Inpex Corporation 1605

Company

株式会社INPEXInpex Corporation

Investors

Buys

Total Value

¥691.6B ($4.5B)

Avg Return

+148.24%

Last Filing

2025-10-03

Inpex Corporation (1605) has 28 disclosed large-shareholding filings and 17 disclosed disposals on record, filed by 16 distinct investors. Together those filings cover ¥691.6B ($4.5B) in reported transaction value. The earliest filing StockDrifts holds for Inpex Corporation is dated 2021-03-19; the most recent is 2025-10-03. 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 +148.24%, 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
2025-10-03	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	56.2M	¥2,598	+47.9%	¥146.0B ($941.7M)
2025-10-03	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	8.3M	¥2,598	+47.9%	¥21.6B ($139.3M)
2025-10-03	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	49.7K	¥2,598	+47.9%	¥129M ($833K)
2025-04-04	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	24.3M	¥1,877.5	-104.7%	¥6.9B ($44.2M)
2025-04-04	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	28.3M	¥1,877.5	-104.7%	¥17.3B ($111.3M)
2024-12-05	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	54.1M	¥1,992	-92.9%	¥7.3B ($46.9M)
2024-12-05	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.9M	¥1,992	-92.9%	¥6.8B ($43.7M)
2024-12-05	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.3M	¥1,992	+92.9%	¥451.5B ($2.9B)
2024-12-05	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	unknown	0	¥1,992	+92.9%	-
2024-05-08	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	57.8M	¥2,333.5	+64.7%	¥3.2B ($20.9M)
2024-05-08	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	5.3M	¥2,333.5	-64.7%	¥7.3B ($47.4M)
2024-05-08	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-16.4K	¥2,333.5	-64.7%	¥1.8B ($11.4M)
2024-05-08	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥2,333.5	+64.7%	-
2024-03-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	8.4M	¥2,284	+68.3%	¥19.2B ($123.9M)
2024-03-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	56.4M	¥2,284	+68.3%	¥128.9B ($831.4M)
2024-03-22	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	767.3K	¥2,284	+68.3%	¥1.8B ($11.3M)
2024-02-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	28.0M	¥1,977	+94.4%	¥55.4B ($357.2M)
2024-02-06	BUY	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	37.5M	¥1,977	+94.4%	¥74.1B ($477.9M)
2023-09-22	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	26.2M	¥2,263.5	-69.8%	¥314M ($2.0M)
2023-09-22	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	38.2M	¥2,263.5	-69.8%	¥14.1B ($91.1M)
2023-09-22	SELL	Market Buy	オービス・インベストメント・マネジメント・リミテッド(Orbis Investment Management Limited) Orbis Investment Management Limited	activist	61.3M	¥2,263.5	-69.8%	¥32.6B ($210.6M)
2023-06-21	BUY	block_purchase	オービス・インベストメント・マネジメント・リミテッド(Orbis Investment Management Limited) Orbis Investment Management Limited	activist	75.7M	¥1,604	+139.6%	¥2.7B ($17.2M)
2023-06-16	BUY	unknown	オービス・インベストメント・マネジメント・リミテッド(Orbis Investment Management Limited) Orbis Investment Management Limited	other	74.1M	¥1,637	+134.8%	¥121.3B ($782.7M)
2023-04-20	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	26.4M	¥1,471	+161.3%	¥38.8B ($250.5M)
2023-04-20	BUY	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	44.4M	¥1,471	+161.3%	¥65.3B ($421.4M)
2023-03-06	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	43.5M	¥1,495	-157.1%	¥1.2B ($8.0M)
2023-03-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	25.2M	¥1,495	+157.1%	¥37.6B ($242.7M)
2022-12-21	BUY	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	44.4M	¥1,404	+173.7%	¥62.4B ($402.5M)
2022-12-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	25.1M	¥1,404	+173.7%	¥35.3B ($227.6M)
2022-12-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	24.5M	¥1,485	-158.8%	¥2.3B ($14.6M)
2022-12-06	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	44.7M	¥1,485	-158.8%	¥3.3B ($21.3M)
2022-03-22	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	16.4M	¥1,435	+167.8%	¥23.5B ($151.4M)
2022-03-22	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	2.3M	¥1,435	+167.8%	¥3.3B ($21.3M)
2022-03-22	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	17.6M	¥1,435	+167.8%	¥25.3B ($163.2M)
2022-03-22	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	19.6M	¥1,435	+167.8%	¥28.1B ($181.4M)
2022-03-22	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	7.0M	¥1,435	+167.8%	¥10.0B ($64.6M)
2022-03-22	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	1.6M	¥1,435	+167.8%	¥2.2B ($14.5M)
2022-03-22	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	2.5M	¥1,435	+167.8%	¥3.6B ($23.0M)
2022-03-22	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	2.9M	¥1,435	+167.8%	¥4.2B ($27.2M)
2022-03-04	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	26.0M	¥1,337	+187.4%	¥1.3B ($8.4M)
2022-03-04	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	47.0M	¥1,337	+187.4%	¥2.4B ($15.5M)
2021-12-06	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	47.7M	¥947	-305.8%	¥3.2B ($20.5M)
2021-12-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	26.5M	¥947	-305.8%	¥1.1B ($7.1M)
2021-11-12	SELL	unknown	石油資源開発株式会社 Japan Petroleum Exploration Co., Ltd.	other	53.4M	¥971	-295.8%	¥109.0B ($703.5M)
2021-08-05	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	27.6M	¥773	+397.1%	¥904M ($5.8M)
2021-08-05	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	51.0M	¥773	+397.1%	¥1.2B ($8.0M)
2021-03-19	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	26.5M	¥641.688	-498.9%	¥1.9B ($12.1M)
2021-03-19	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	49.4M	¥641.688	-498.9%	¥1.6B ($10.3M)

Frequently asked questions

Who has been buying Inpex Corporation stock?: 16 distinct investors have filed 28 disclosed large-shareholding filings in Inpex Corporation (1605), most recently on 2025-10-03. 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 Inpex Corporation have?: Inpex Corporation has 28 buy-side and 17 sell-side disclosures on record, covering ¥691.6B ($4.5B) in total reported value, spanning 2021-03-19 to 2025-10-03.
Where does StockDrifts get Inpex Corporation 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 Inpex Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.