HWM vs RKLB: 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: HWM 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. HWM and RKLB 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 HWM and RKLB 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.

Howmet Aerospace is a manufacturer of advanced engineered components for the aerospace and transportation industries. It is a leading maker of investment-cast turbine blades and structural castings for jet engines, engineered fastening systems used to hold aircraft together, aluminum and titanium structural parts, and forged aluminum wheels for commercial trucks. Howmet's products are highly engineered, precision metal parts that operate in extreme temperature and stress environments, particularly the hot sections of jet engines. The company makes money supplying these mission-critical components to engine makers and airframers for new aircraft production, and it earns substantial recurring spares and aftermarket revenue as engines are maintained over their long lives. Howmet was formed from the breakup of the old Arconic and Alcoa lineage and is now a focused aerospace and transportation supplier headquartered in Pittsburgh, Pennsylvania, with about 25,400 employees. Trailing revenue reached roughly $9.1 billion by mid-2026, up from $8.25 billion for full-year 2025, and quarterly sales climbed from $2.09 billion in the September 2025 quarter to $2.55 billion in the June 2026 quarter. It is widely viewed as a high-quality aerospace components company leveraged to rising commercial aircraft build rates and air travel.

Full HWM guide

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

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

• HWM drivers: Commercial aerospace ramp; Engine spares and aftermarket.
• RKLB drivers: Neutron medium-lift rocket; Space Systems growth.

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: Howmet is heavily exposed to commercial aerospace, so any downturn in air travel, airline financial stress, or a slowdown at Boeing and Airbus, including production problems or order cancellations, would reduce demand. For RKLB, 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.

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 HWM if you believe its drivers more; RKLB 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 HWM and RKLB guides.

HWM. As of October 16, 2026, Howmet trades near 48x trailing and 34x forward earnings and almost 10x sales, still a large premium to traditional industrials, backed by roughly 24% revenue growth and earnings that analysts expect to rise about 42% in 2026. The multiple has compressed with the share price, which is down about 20% over three months though still up about 5% year to date. Third-quarter results on October 29 (consensus EPS about $1.37 on $2.59 billion of revenue) are the next test of whether growth can keep pace with the valuation.

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.

Headline figures (approximate, October 2026): HWM shows revenue (ttm) ~$9.1 billion, revenue growth (latest quarter, yoy) ~24%, operating margin ~28.5%, net income (ttm) ~$1.9 billion; 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%.

HWM and RKLB 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 HWM and RKLB exposure against your real portfolio. It is not an investment adviser.