[5] Sara and Ajuy remained the top sugar producers in Iloilo until the onset of the American colonization, followed by Balasan, Passi and Dingle (Panay Directory and Souvenir Book, 1937).

In 1928, the Central Azucarera de Sara-Ajuy was incorporated by the Ynchausti y Cia, and established a sugar mill in Ajuy (Annual Report of the Governor General of the Philippine Islands, 1929).

Before World War II broke out, the Central Azucarera de Sara-Ajuy recorded a production of 108,725.52 piculs during the crop year 1941–1942.

"However, in the course of the Japanese invasion... there came a total blackout on the sugar milling activities," wrote historian Henry Funtecha in "Iloilo in the 20th Century: An Economic History (1997)".

After the war, Central Azucarera de Sara-Ajuy briefly resumed operations but found it difficult to recover until it eventually closed.