RKLB vs SPCX: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of October 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: SPCX is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. RKLB and SPCX share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined RKLB and SPCX exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Rocket Lab (RKLB) is a space company that builds rockets and spacecraft and provides end-to-end space services. Its established business is the Electron, a small orbital launch vehicle that is one of the most frequently flown small rockets in the world, carrying satellites for commercial, government, and defense customers. Rocket Lab is developing Neutron, a larger, partly reusable medium-lift rocket intended to compete for bigger payloads and constellation deployments, directly targeting the market SpaceX dominates.

Full RKLB guide

SpaceX, formally Space Exploration Technologies Corp., is the largest launch provider in the world and the operator of the largest satellite-broadband constellation. It listed on Nasdaq under SPCX in June 2026 in the largest IPO on record by proceeds, after more than twenty years as a private company. It employs roughly 22,000 people and is classified in Aerospace and Defense.

Full SPCX guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• RKLB drivers: Neutron medium-lift rocket; Space Systems growth.
• SPCX drivers: Satellite broadband is the revenue engine; Direct-to-device and carrier partnerships.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Rocket Lab is not yet consistently profitable and invests heavily in Neutron, so cash burn and capital needs are real until that program generates revenue: trailing free cash flow is about -$252 million and the company funded itself with about $1.53 billion of stock sales in the first half of 2026, diluting holders. For SPCX, spaceX is not profitable: net margin ran around negative 36 percent on roughly $23 billion of trailing revenue, with a trailing net loss of about $8.9 billion, even though EBITDA of about $5.9 billion is positive and the trailing operating margin is close to break-even at about -1.8 percent.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick RKLB if you believe its drivers more; SPCX if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the RKLB and SPCX guides.

RKLB. Rocket Lab trades as a high-growth space name valued on its Space Systems revenue, backlog and the future option value of Neutron rather than current profits; forward P/E is not meaningful with expected EPS near zero. Even after falling from a 52-week high of $151 to about $52, the stock sits near 43x trailing sales, so the October 2026 Neutron delay and the November 9 Q3 report (consensus revenue about $257 million) matter more to valuation than near-term earnings.

SPCX. SpaceX is valued as a growth company rather than an aerospace contractor, and the gap is stark: the defense primes trade on single-digit to low-double-digit multiples of earnings, while SPCX trades at roughly 83 times trailing sales and about 73 times forward earnings. Gross margin near 52 percent reflects the subscription mix in Connectivity, and the trailing operating margin has moved close to break-even, but the net result is still a loss because depreciation and development costs are large. The forward multiple depends on consensus EPS rising from about $0.09 in 2026 to about $2.08 in 2027; 31 analysts carry a mean target near $221 against a price of about $146.

Headline figures (approximate, October 2026): RKLB shows revenue (ttm) ~$769 million, up ~62% year over year in Q2 2026, backlog ~$2.36 billion record (end Q2 2026), gross margin ~37% GAAP TTM; ~41.5% non-GAAP in Q2 2026, operating margin (ttm) ~-25%; SPCX shows revenue (ttm) ~$23.0 billion, revenue growth (q2 2026) ~92% year over year, on ~$7.81 billion of quarterly revenue, margins (ttm) ~52% gross, ~-1.8% operating, ~-36% net, net loss (ttm) ~-$8.9 billion; Q2 2026 EPS ~-$0.09 vs ~-$0.29 expected.

RKLB and SPCX are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined RKLB and SPCX exposure against your real portfolio. It is not an investment adviser.