1 insider bought €1.1B of shares over the last 90 days, the latest by Aramco Downstream Asia Pte. Ltd., filed 08 Oct 2026.
Idemitsu Kosan Co.,Ltd.: what insiders have been doing
Every trade that managers of Idemitsu Kosan Co.,Ltd. disclose to EDINET (Japan FSA) is tracked on this page. The company sits in the Energy sector and is based in Chiyoda, Japan. It was founded in 1911. Over the twelve months to 26 October 2026, 14 filings were filed, from 4 insiders.
Only purchases show up on the open market, 1 purchase in all worth €1.1B, filed by 1 insider. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Those buying include 1 major shareholder. Biggest ticket of the year: €1.1B, bought by Aramco Downstream Asia Pte. Ltd. and made public on 8 October 2026 (10.2% of market cap).
With 14 filings in twelve months, the company is more active than the median of 3 filings across the 3,205 companies we follow on the same exchange. The full history, which starts in 2022, counts 2 purchases against no sales.
The most recent open-market purchase was published on 8 October 2026, 31 days ago. Between a trade and the moment it shows up on EDINET (Japan FSA), the median delay is 16 days. The shorter that gap, the sooner other investors can see what insiders have done.
Source: insider filings from EDINET (Japan FSA). Past trades are no guide to future returns.
Who traded when
BuySaleAnalyst consensus: bullish or bearish?
Analysts rate Idemitsu Kosan Co.,Ltd. Buy (bullish), based on 7 analysts. Average price target: JP¥1,609.
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2026FY ended March 2026 · cache
- ShareXTKSEDINET:S100Z6YQ
- ShareXTKSEDINET:S100XZUM
- 100.0% of flowShareXTKSEDINET:S100Y713
- 115,579,000 shares@ JP¥1,653.0410.17% mcap100.0% of flowShareXOFFEDINET:S100Y713:T1Canonical exit: 30 Dec 2026 (T+90)
- ShareXTKSEDINET:S100YU85
- 9.0% of flowShareXTKSEDINET:S100Y9IK
- ShareXTKSEDINET:S100Y9IC
- ShareXTKSEDINET:S100Y5X4
- 9.0% of flowShareXTKSEDINET:S100XEMJ
- 9.0% of flowShareXTKSEDINET:S100XCZS
- 9.1% of flowShareXTKSEDINET:S100XBPW
- 9.2% of flowShareXTKSEDINET:S100XBPT
- 9.1% of flowShareXTKSEDINET:S100XC9O
- 9.4% of flowShareXTKSEDINET:S100X65Z
- ShareXTKSEDINET:S100WTR2
- ShareXTKSEDINET:S100WAWE
- 9.9% of flowShareXTKSEDINET:S100W6JH
- ShareXTKSEDINET:S100VVOP
- ShareXTKSEDINET:S100VPGN
- ShareXTKSEDINET:S100V6D1
- 8.3% of flowShareXTKSEDINET:S100USOA
- ShareXTKSEDINET:S100UTHE
- 8.3% of flowShareXTKSEDINET:S100UJTH
- ShareXTKSEDINET:S100U76N
- ShareXTKSEDINET:S100U2MQ
25 of 35 declarations
About Idemitsu Kosan Co.,Ltd.
Idemitsu Kosan Co., Ltd. is a Japanese company specializing in the energy sector. It is listed on the Tokyo Stock Exchange under the symbol XTKS.
