Archer Aviation (ACHR) shares surged 7.3% to $12.41 on October 6, 2025, driven by speculation of a potential partnership with Tesla. The stock rally was sparked by a cryptic video from Archer featuring its Midnight eVTOL alongside Tesla products, followed by a Tesla post hinting at an announcement on October 7. The speculation led to a trading volume of over 48.7 million shares, with retail traders on Stocktwits amplifying the momentum. Despite the excitement, neither Archer nor Tesla has confirmed any partnership rumors.