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Idemitsu Kosan Co.,Ltd. 5019

Company
出光興産株式会社Idemitsu Kosan Co.,Ltd.
Investors
20
Buys
38
Total Value
¥411.8B ($2.7B)
Avg Return
+51.36%
Last Filing
2026-01-08

Idemitsu Kosan Co.,Ltd. (5019) has 38 disclosed large-shareholding filings and 19 disclosed disposals on record, filed by 20 distinct investors. Together those filings cover ¥411.8B ($2.7B) in reported transaction value. The earliest filing StockDrifts holds for Idemitsu Kosan Co.,Ltd. is dated 2021-04-07; the most recent is 2026-01-08. Across these filings the average return since disclosure is +51.36%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-08-06SELLunknown
野村證券株式会社
other498.7K¥1,258.5-27.2%¥13.2B ($85.4M)
2026-08-06BUYMarket Buy
ノムラ インターナショナル ピーエルシー
NOMURA INTERNATIONAL PLC
other837.7K¥1,258.5+27.2%¥1.5B ($9.9M)
2026-08-06SELLunknown
野村アセットマネジメント株式会社
other54.6M¥1,258.5-27.2%¥2.0B ($12.9M)
2026-06-09BUYMarket Buy
日章興産株式会社
strategic109.5M¥1,339+19.6%¥7.4B ($47.6M)
2026-06-09BUYMarket Buy
正和興産株式会社
strategic24.9M¥1,339+19.6%¥1.6B ($10.6M)
2026-06-09BUYMarket Buy
MIパワー株式会社
strategic12.6M¥1,339+19.6%¥983M ($6.3M)
2026-06-09BUYMarket Buy
株式会社善
strategic17.8M¥1,339+19.6%¥1.3B ($8.5M)
2026-06-09BUYMarket Buy
株式会社縁
strategic17.6M¥1,339+19.6%¥1.1B ($7.4M)
2026-06-09BUYunknown
出光 千惠子
strategic4.8M¥1,339-¥6.5B ($41.6M)
2026-05-28BUYunknown
出光千惠子
strategic4.8M¥1,314.5+21.8%¥6.3B ($40.9M)
2026-05-28BUYunknown
日章興産株式会社
strategic109.5M¥1,314.5+21.8%¥144.0B ($928.8M)
2026-05-28BUYunknown
出光千惠子
strategic4.8M¥1,314.5+21.8%¥6.3B ($40.9M)
2026-05-28BUYunknown
日章興産株式会社
strategic109.5M¥1,314.5+21.8%¥144.0B ($928.8M)
2026-01-08BUYunknown
日章興産株式会社
strategic109.5M¥1,188--
2026-01-08BUYunknown
正和興産株式会社
strategic24.9M¥1,188--
2026-01-08BUYunknown
MIパワー株式会社
strategic12.6M¥1,188--
2026-01-08BUYunknown
株式会社善
strategic17.8M¥1,188--
2026-01-08BUYunknown
株式会社縁
strategic17.6M¥1,188--
2025-12-22BUYunknown
MIパワー株式会社
strategic12.6M¥1,171.5--
2025-12-22BUYunknown
株式会社善
strategic17.8M¥1,171.5+36.7%¥10.0B ($64.3M)
2025-12-22BUYunknown
正和興産株式会社
strategic24.9M¥1,171.5--
2025-12-22BUYunknown
日章興産株式会社
strategic127.6M¥1,171.5--
2025-12-22BUYunknown
MIパワー株式会社
strategic12.6M¥1,171.5--
2025-12-22BUYunknown
株式会社善
strategic9.3M¥1,171.5--
2025-12-22BUYunknown
株式会社縁
strategic8.0M¥1,171.5--
2025-12-22SELLunknown
日章興産株式会社
strategic109.5M¥1,171.5-36.7%¥21.1B ($136.4M)
2025-12-22BUYunknown
正和興産株式会社
strategic24.9M¥1,171.5--
2025-12-22BUYunknown
MIパワー株式会社
strategic12.6M¥1,171.5--
2025-12-22BUYunknown
株式会社縁
strategic17.6M¥1,171.5+36.7%¥11.3B ($73.1M)
2025-12-22BUYunknown
日章興産株式会社
strategic127.6M¥1,171.5--
2025-12-22BUYunknown
正和興産株式会社
strategic24.9M¥1,171.5--
2025-12-22BUYunknown
MIパワー株式会社
strategic12.6M¥1,171.5--
2025-12-22BUYunknown
株式会社善
strategic9.3M¥1,171.5--
2025-12-22BUYunknown
株式会社縁
strategic8.0M¥1,171.5--
2025-12-22SELLunknown
日章興産株式会社
strategic109.5M¥1,171.5-36.7%¥21.1B ($136.4M)
2025-12-22BUYunknown
正和興産株式会社
strategic24.9M¥1,171.5--
2025-12-22BUYunknown
株式会社善
strategic17.8M¥1,171.5+36.7%¥10.0B ($64.3M)
2025-12-22BUYunknown
株式会社縁
strategic17.6M¥1,171.5+36.7%¥11.3B ($73.1M)
2025-11-21BUYunknown
日章興産株式会社
Nissho Kosan Co., LTD.
strategic127.6M¥1,146.5+39.6%¥2.4B ($15.3M)
2025-11-21BUYunknown
正和興産株式会社
Seiwa Kosan Co., Ltd.
strategic24.9M¥1,146.5+39.6%¥2.1B ($13.3M)
2025-11-21BUYunknown
MIパワー株式会社
MI Power Co., Ltd.
strategic12.6M¥1,146.5+39.6%¥1.0B ($6.7M)
2025-11-21BUYunknown
株式会社善
Zen Co., Ltd.
strategic9.3M¥1,146.5-¥10.7B ($68.9M)
2025-11-21BUYunknown
株式会社縁
En Co., Ltd.
strategic8.0M¥1,146.5-¥9.2B ($59.2M)
2025-11-21BUYunknown
日章興産株式会社
Nissho Kosan Co., LTD.
strategic127.6M¥1,146.5+39.6%¥2.4B ($15.3M)
2025-11-21BUYunknown
MIパワー株式会社
MI Power Co., Ltd.
strategic12.6M¥1,146.5+39.6%¥1.0B ($6.7M)
2025-11-21BUYunknown
株式会社善
Zen Co., Ltd.
strategic9.3M¥1,146.5-¥10.7B ($68.9M)
2025-11-21BUYunknown
株式会社縁
En Co., Ltd.
strategic8.0M¥1,146.5-¥9.2B ($59.2M)
2025-11-21BUYunknown
日章興産株式会社
Nissho Kosan Co., LTD.
strategic127.6M¥1,146.5+39.6%¥2.4B ($15.3M)
2025-11-21BUYunknown
正和興産株式会社
Seiwa Kosan Co., Ltd.
strategic24.9M¥1,146.5+39.6%¥2.1B ($13.3M)
2025-11-21BUYunknown
MIパワー株式会社
MI Power Co., Ltd.
strategic12.6M¥1,146.5+39.6%¥1.0B ($6.7M)

Showing the 50 most recent of 124 filings.

Frequently asked questions

Who has been buying Idemitsu Kosan Co.,Ltd. stock?
20 distinct investors have filed 38 disclosed large-shareholding filings in Idemitsu Kosan Co.,Ltd. (5019), most recently on 2026-01-08. 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 Idemitsu Kosan Co.,Ltd. have?
Idemitsu Kosan Co.,Ltd. has 38 buy-side and 19 sell-side disclosures on record, covering ¥411.8B ($2.7B) in total reported value, spanning 2021-04-07 to 2026-01-08.
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.