Archer Stock Jumps 19.59% to $5.31 on Thunder Defense Aircraft Reveal on July 20

According to the announcement at Farnborough Airshow on July 20, 2026, Archer Aviation (NYSE: ACHR) stock jumped 19.59% to close at $5.31 after unveiling Thunder, a Group 5 autonomous attack rotorcraft co-developed with Anduril Industries. Thunder, with a series hybrid-electric powertrain and modular payload capacity, represents Archer's expansion beyond urban air mobility into defense procurement, which operates under different regulatory timelines than FAA passenger certification.

Archer carries a market capitalization near $4.03 billion with roughly $1.80 billion in total liquidity, leaving approximately $2.23 billion of enterprise value for an aircraft whose first flight is planned for 2027. The company burns approximately $189 million per quarter against Q1 2026 revenue of just $1.60 million. Notably, Archer's share count has grown 57.70% year over year to 759.60 million, with analyst targets ranging from $4.50 to $18.00. The company committed to naming Thunder's first commercial partners during the week of July 20, a near-term test of whether the announcement converts into funded orders.