The Mechanism
When Congress fights over NASA's budget — a continuing resolution that freezes spending, a rescission clawing back unspent funds, or a supplemental appropriations bill that supercharges a particular mission — it is not an abstraction. Boeing holds the prime contract for the Space Launch System (SLS), the heavy-lift rocket at the center of the Artemis lunar program. That means every line item Congress inserts, cuts, or delays in NASA's Exploration Systems Development account flows directly into BA's recognized revenue and contract backlog. Boeing's Defense, Space & Security segment has repeatedly flagged SLS cost overruns and schedule slippage; additional budget uncertainty compounds those pressures. When a continuing resolution prevents NASA from executing new contract modifications or obligating supplemental funds, Boeing cannot accelerate production or close out cost growth. When a rescission hits Artemis, Boeing's backlog shrinks before the market fully prices it.