Consejeros Editorial TeamThe chairman of ACS, Florentino Pérez, has strengthened his position as the construction firm’s largest shareholder after increasing his stake for the third time this year to an all-time high of 15.015 per cent. According to the latest records from the National Securities Market Commission (CNMV), the executive has increased his stake in ACS from the previous 14.896 per cent to the current 15.015 per cent through his company, Rosán Inversiones. As a result, the construction firm’s chairman now controls a block of 41.61 million shares in the company which, at current market prices, is worth approximately €4.540 million. Florentino Pérez has thus consolidated his position as ACS’s largest shareholder, ahead of Criteria Caixa (10.648 per cent) and BlackRock (5.057 per cent). Shares in the construction firm fell by 0.83% at 10.30 am on Tuesday, and have risen by 28.7% in 2026 and 74.9% over the past year.