Archer Aviation Inc. after-hours up 3.56% following Stellantis' $55 million investment and collaboration for electric aircraft battery development.

Archer Aviation Inc. experienced a 3.56% increase in after-hours trading. The stock's upward movement was likely influenced by the news that the company received a $55 million investment from Stellantis, a major automaker, which supports Archer's electric vertical take-off and landing aircraft business. This partnership and funding could boost the company's growth prospects and confidence in the market, contributing to the after-hours surge.