Shares cratered as Rocket Lab pushed the maiden flight of its next-generation rocket into 2027, compounding a week-long selloff that has now lopped roughly 25% off the stock since October 6. On October 14, shares fell 7.9% during regular trading and dropped an additional 7.3% in after-hours trading , bringing the Frankfurt-listed price to €48.45 — down 15% on the day and a far cry from its 52-week high above $150.

  • Air Pockets in a Carbon Shell Exposed a Manufacturing Gap

CEO Peter Beck said inspections discovered voids — small air pockets — in the carbon-composite shell of a fuel propellant tank, weakening its structure.

The delay follows an earlier setback: a first-stage tank ruptured during pressure testing in January 2026. After that failure, the company shifted from a third-party hand-layup process to automated fiber placement technology , but the new method introduced its own defects. Two separate manufacturing problems in nine months raise questions about how quickly Rocket Lab can industrialize hardware that is, by Beck's own admission, "the largest pressurised structure ever made out of carbon composite."

  • The Stock's Valuation Was Already Pricing In a Rocket That Hasn't Flown

Even at roughly $73, Rocket Lab carried a market value near $45 billion — about 59 times the roughly $769 million of revenue the company generated over the trailing four quarters. That premium assumed Neutron revenue would arrive on schedule. Customers had been booking Neutron flights at $50–55 million each , but meaningful Neutron revenue was not expected to hit financials until 2027–2028. The delay pushes that timeline further out, making an already stretched valuation harder to defend.

  • A $2.36 Billion Backlog Buys Time — But Burns Cash

Rocket Lab reported record Q2 revenue of $234 million, up 62% year over year, and a record backlog of $2.36 billion. That backlog spans more than 100 missions and is almost entirely third-party customers. But free cash flow was roughly negative $110 million in Q2 , and Rocket Lab's own SEC filing warns that additional Neutron delays "may require more research, development and capital expenditures than we currently anticipate."

  • SpaceX Isn't Waiting Around

Neutron is designed to compete for the constellation-deployment, national-security, and deep-space missions currently served almost exclusively by SpaceX's Falcon 9. Every quarter Neutron sits on the ground is another quarter SpaceX locks in contracts and lowers its own costs through reuse. Delays hinder Rocket Lab's efforts to compete by postponing access to the larger medium-lift market and significant commercial opportunities. The $17 billion NSSL Lane 1 government contract ceiling that analysts cite as Neutron's prize remains inaccessible until the rocket proves it can fly.

Beck's message to investors — "Possible success isn't our standard" — signals prudence. But prudence doesn't pay development bills, and every slip deepens the gap between what the market is paying today and what the company can deliver tomorrow.