Boeing vs. Rocket Lab: Which Aerospace Stock Is a Better Buy in 2026?

The aerospace industry is evolving as Boeing (NYSE:BA) attempts a massive operational turnaround while Rocket Lab (NASDAQ:RKLB) rapidly expands its footprint across the global space economy.

Boeing remains a dominant force in commercial aviation and defense, whereas Rocket Lab specializes in small-satellite launches and spacecraft components. Investors often compare them to decide between an established giant recovering from crisis and a high-growth challenger in the private space sector.

The case for Boeing

Boeing operates as a massive player among defense stocks and commercial aviation leaders, manufacturing everything from the 737 Max to advanced military rotorcraft. The company generates revenue through commercial aircraft sales, defense contracts with the U.S. Department of Defense and NASA, and global services. Customer concentration like this adds a layer of risk to the business. In 2025, the company acquired Spirit AeroSystems to address long-standing quality issues, providing transition services to other buyers like Airbus (OTC:EADSF).

In FY 2025, revenue reached nearly $89.5 billion, representing a growth of roughly 34.5% over the previous year. The company reported a net income of approximately $2.2 billion, a significant recovery from the net loss of nearly $11.8 billion in FY 2024. This improvement in the net margin to 2.5% suggests the company is beginning to stabilize its bottom line after years of heavy losses.

As of its December 2025 balance sheet, Boeing carries a debt-to-equity ratio of nearly 10.0x, a measure comparing total debt to shareholder equity that indicates a heavy reliance on borrowing. The company reported a current ratio of nearly 1.2x, which measures a company's ability to cover its short-term debts with liquid assets. Note that stock-based compensation represented roughly 40% of operating cash flow, which inflates reported cash generation since SBC is a non-cash expense added back in the cash flow statement. The company also generated a negative free cash flow of approximately $1.9 billion, representing operating cash minus spending on physical assets.

The case for Rocket Lab

Rocket Lab provides end-to-end space solutions, including launch services with its Electron rocket and the development of the larger Neutron vehicle. It also manufactures satellites and spacecraft components for government agencies like NASA and commercial clients such as Canon (OTC:CAJFF) and Synspective (OTC:SYSPF). This reliance on government and high-profile commercial entities creates a specific concentration risk for the company. Rocket Lab is currently in the process of acquiring Iridium Communications (NASDAQ:IRDM), with the transaction expected to close by mid-2027.

In FY 2025, revenue reached close to $601.8 million, marking a growth of approximately 38% compared to FY 2024. The company reported a net loss of nearly $198.2 million, which slightly widened from the net loss of close to $190.2 million recorded in the prior year. While the net margin improved from negative 43.6% to negative 32.9%, the company has yet to achieve profitability as it reinvests heavily in its Neutron program.

Rocket Lab maintained a very conservative balance sheet as of its December 2025 filing. Its current ratio was nearly 4.1x, suggesting a strong ability to cover short-term debts with its available cash and assets. The debt-to-equity ratio was approximately 0.1x, indicating that the company uses very little debt relative to its equity. Free cash flow was negative $321.8 million for the year, largely due to the capital-intensive nature of developing new launch vehicles and space infrastructure.

Risk profile comparison

Boeing faces significant operational hurdles, including delivery delays for the 777X and 737 programs due to production rate caps from the FAA. The company also manages losses on fixed-price defense contracts and faces potential volatility from labor union actions. Furthermore, geopolitical tensions with China could impact international sales, which accounted for close to 46% of its FY 2025 revenue. Integrating Spirit AeroSystems remains a complex financial and operational task that requires careful management of credit ratings.

Rocket Lab carries risks related to its rapid scaling and the high capital costs of the Neutron project. Any launch failure for the Electron vehicle could disrupt revenue and significantly increase insurance costs. The company also competes in an increasingly crowded market against established giants like Lockheed Martin (NYSE:LMT) and Northrop Grumman (NYSE:NOC). Additionally, its future profitability depends on the successful integration of its acquisitions and the continued availability of government funding for space exploration and defense programs.

Valuation comparison

Boeing appears much cheaper on a sales basis, though Rocket Lab's valuation reflects higher growth expectations from investors despite its lack of current earnings.

Valuation metrics sourced from Financial Modeling Prep (FMP) and may differ from other data providers.

Which stock would I buy in 2026?

I'd go with Rocket Lab. Its combination of accelerating revenue growth, a record backlog surpassing $2 billion, and a launch cadence that keeps expanding makes it one of the most exciting pure-play space investments available to investors today. Rocket Lab signed more launch contracts in one quarter than it did in all of the prior year, and the Neutron rocket program adds a growth engine that could dramatically expand its addressable market.

Boeing, to its credit, is making strong progress. Commercial deliveries rose sharply year over year and free cash flow turned positive and beat expectations. And the FAA recently restored its authority to self-certify aircraft, which is a meaningful regulatory milestone for a company that spent years rebuilding trust with regulators.

But Boeing is still losing money every quarter, carrying an enormous debt load, and managing a defense segment that keeps absorbing unexpected charges. The turnaround is moving in the right direction, but it is far from finished.

Rocket Lab is already growing at a pace that would make most aerospace companies envious, and the runway ahead of it keeps expanding. Investors willing to accept some volatility in exchange for a front-row seat to the commercialization of space will find Rocket Lab the more compelling place to put their money right now.

Sara Appino has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Boeing, Lockheed Martin, and Rocket Lab. The Motley Fool has a disclosure policy.