Katsumi Shimomura

Katsumi Shimomura is a declared insider of 株式会社城南進学研究社 (major shareholder), with filings sourced from EDINET (Japan FSA). Over a trading history stretching from 1 April 2021 to 6 March 2026, the count stands at 14 filings.

The filings describe grants, exercises and other transfers rather than trades on the open market. Grants and option exercises follow pay plans set in advance, so they reveal less about an insider's own view than a purchase made with personal money.

Most recently, on 16 March 2026, the filings show a transaction in 株式会社城南進学研究社. Typically, a trade is published a median of 5 days after it takes place. This delay matters because a trade only becomes useful information once it is public. Source: insider filings from EDINET (Japan FSA). Past trades are no guide to future returns.