What was the first Pixar feature film to receive a sequel?

Toy Story was the first Pixar feature film to receive a sequel.

Toy Story 2, released in 1999, continued the story of Woody, Buzz Lightyear, and their toy friends. It followed Pixar's 1995 debut feature, Toy Story, and arrived before sequels to Pixar's other early successes. The sequel began as a project intended for home video but was upgraded to a theatrical release during production.

The original Toy Story was a landmark computer-animated feature and established Pixar as a major animation studio. Its characters and world made it a natural foundation for a continuing series. Pixar later produced additional Toy Story films, including Toy Story 3 in 2010 and Toy Story 4 in 2019.

Cars received its own sequel, Cars 2, in 2011, but it was not Pixar's first sequel. Finding Nemo and The Incredibles also received sequels later. This distinction concerns Pixar feature films, not short films, television specials, or franchise-related media.