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It was previously reported that the animation studio had expressed an interest in the Marvel Comics creation in order to use CG effects.
However, the Hot Fuzz filmmaker, who is also writing the script, said that commenting on news of Pixar's participation would be "premature".
He told website Chud: "The news that Pixar is involved is not wholly accurate and a little premature to comment on. I love Pixar's work more than anyone and indeed would love to collaborate with them."
He added: "I'm not sure though that they would want to do a 'shrinking' film as a Pixar animation, since Toy Story and A Bug's Life already cover this territory to some extent. I'm guessing that someone just speculated on the 'bug' angle and tried to put two and two together.
"My spin on Ant Man is very different than a straight superhero origin - and very much live action."
Wright is currently adapting the comic book series Scott Pilgrim into a movie, with Michael Cera lined up to star.
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