Ibrahim Dimson and Edmund Duhaney each pleaded guilty to one count of conspiracy in the US federal court as part of a deal with prosecutors.
Details of the agreements were not immediately available, including their sentences.
Former Coke secretary Joya Williams –- who allegedly plotted with the pair -- is scheduled to stand trial on November 13.
The trio were indicted on July 11 on federal conspiracy charges after being accused of stealing new product samples and confidential documents from Atlanta-based Coca-Cola and trying to sell them to Pepsi, which is headquartered in Purchase, New York.
The alleged crime was foiled after Pepsi tipped off Coca-Cola about the plan.
The prosecution says a box containing two undisclosed Coca-Cola product samples and other confidential company documents was found in Duhaney's home during a search on July 5, the day all three were arrested and the same day a $US1.5 million ($A1.98 million) transaction was to occur.
Documents were also found in Williams's home.
Coke has declined to reveal which product or products are linked to the samples.
Williams, who has since been fired as an administrative assistant for Coke's global brand director at its Atlanta headquarters, allegedly took the information from the company and gave it to Dimson and Duhaney.