The "very respected" Carlos Osório de Castro regularly represents public companies in IPOs and tender offers. He has particular expertise in securities transactions, including those under Rule 144A. He is especially active within the energy and retail spaces.

Carlos Osório de Castro 's expertise is widely recognised in the market. He is regularly active in sales, public tender bids or joint ventures within the energy and infrastructure sectors. His impressive client base includes both domestic and international companies, which he assists with multi-jurisdictional mandates.

Carlos Osório de Castro commands respect for his impressive expertise in corporate and capital markets transactions, including multi-jurisdictional operations. Commentators single him out as "one of the biggest names in the Porto legal market" and commend his "above average knowledge and vision of the law."