Joby Aviation (JOBY) Shares Drop as $500 Million Defense Contract Raises Funding Concerns
Joby Aviation (JOBY) shares fell 4.43% to $8.42 after announcing a roughly $500 million acquisition of Resonant Sciences. Joby plans to pay $450 million in cash and $50 million in stock, using cash equal to 19.9% of June liquidity. Resonant reported over $100 million trailing revenue and high-teens adjusted EBITDA margins; Joby expects 2026 revenue of $115m-$125m.
How this was made

The 30-second read
Why it matters
The primary trading issue is whether the $450 million cash component and ongoing certification cash burn can be funded without dilution or debt, and whether Resonant’s backlog converts into sustained cash flow and margins.
Market read
Deal terms and cash usage dominate the market reaction, shifting focus from certification progress to near-term financing risk and backlog-to-cash execution.
What to watch
The article notes bookings more than tripled and backlog more than doubled; if those translate into near-term contract revenue, the liquidity concern may be overstated versus the market’s initial reaction.
Background
Joby is pursuing aircraft certification and scaling its air-taxi business, while seeking to broaden defense revenue through acquisitions.
Ticker impact
Joby shares fell 4.43% after announcing it will acquire Resonant Sciences for about $500 million, using $450 million cash.
Near-term downside bias until investors gain confidence that Resonant backlog converts to cash without additional financing.
The article highlights a large cash outlay (19.9% of liquidity) plus expected heavy cash burn in 2H ($385m-$415m), while warning that execution and financing needs are unresolved.
Market effects
Reinforces that defense-adjacent eVTOL suppliers and electronics providers are becoming acquisition targets, but funding discipline remains a gating factor for the sector.
Limited direct regional impact; the key effects are on US-listed eVTOL and defense electronics supply chains.
Moderate, as defense procurement and certification timelines can influence global investor risk appetite for pre-revenue aerospace programs.
Counterpoint
The acquisition could be value-accretive if Resonant’s high-teens adjusted EBITDA margins and backlog visibility translate into faster cash generation than the market expects.
Key entities
- public_companyJoby Aviation, Inc.
NYSE-listed eVTOL company announcing a ~$500 million acquisition of Resonant Sciences, with shares down 4.43% on liquidity concerns.
- private_companyResonant Sciences
Defense electronics contractor acquired by Joby; reported over $100 million trailing revenue and high-teens adjusted EBITDA margins.





