[3] By the end of the 1980s, the company had a 40% market share in long steel in Brazil and faced regulatory scrutiny for further acquisitions.

[8] In 2007, Gerdau acquired a 30.45% stake in Industrias Nacionales (INCA), the largest steel producer in the Dominican Republic, for $42 million.

[14] In January 2018, the company sold its wire rod mill in Beaumont, Texas and two downstream facilities to Optimus Steel for $92.5 million.

[20] In March 2024, the company sold its assets in Colombia and the Dominican Republic, including its interest in Metaldom, to INICIA for $325 million.

[22] In 2025, the company acquired the minority interests in Gerdau Summit from Sumitomo Corporation and Japan Steel Works for a total of $32.6 million.

[23] In March 2015 and in February 2016, Gerdau's offices in São Paulo, Brasília, Rio de Janeiro, Recife and Porto Alegre, the company's headquarters, were raided by the Brazilian federal police as part of Operation Zealots, a probe into tax fraud.

The company and then CEO André Bier Gerdau Johannpeter personally were sued on claims that "executives bribed tax authorities, defrauded Brazil's tax revenue service of $429 million, laundered illegal funds and carried out influence peddling".