Code words, obviously?
To keep it all secret, says Reuters, the dealmakers used code words.
... according to two sources. 3G was called "goose," Heinz was referred to as "penguin" and Berkshire was known as "owl." The news release also refers to the buyer as "Hawk Acquisition Holding Corp".
Cool, right? Except that it very well may not have worked. The SEC is suing some unknown traders for buying Heinz options before the deal was announced. That means someone knew that the price of Heinz stock would spike, so they wanted to buy the option to buy it at a lower price.
Whoops.