Nobuyuki Osumi

Nobuyuki Osumi, listed as major shareholder, has filed trades across 2 companies (mainly through EDINET (Japan FSA)), most often in オープングループ株式会社 and 大角 暢之. We count 5 filings; the first trade dates from 4 October 2021 and the latest from 12 December 2025.

None of the filings is a plain purchase or sale on the open market; they cover grants, option exercises and other movements. Such operations are usually part of compensation schedules, which makes them a weaker signal than an open-market trade.

The latest filing, published on 18 December 2025, reports a transaction in オープングループ株式会社. Filings reach the EDINET (Japan FSA) feed a median of 4 days after the trade. Until a filing is published, the market cannot know about the trade. Source: insider filings from EDINET (Japan FSA). Past trades are no guide to future returns.