SHECY vs WLK: How Shin-Etsu Chemical Co., Ltd. and Westlake Corporation Compare (2026)

Same yardstick, side by side (as of August 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.

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. SHECY and WLK 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 SHECY and WLK 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.

Shin-Etsu Chemical was founded in 1926 and is headquartered in Chiyoda, Tokyo, with roughly 27,900 employees. It reports in four segments. Electronics Materials covers semiconductor silicon wafers, photoresists, photomask blanks, synthetic quartz and rare earth magnets, and delivered net sales of about JPY 1,015.7 billion with operating income of about JPY 344.5 billion in the fiscal year ended March 31, 2026. Infrastructure Materials covers polyvinyl chloride and caustic soda, largely through Shintech in the United States, and delivered about JPY 981.3 billion of sales but only about JPY 164.8 billion of operating income after a roughly 43 percent decline. Functional Materials, which is silicones, cellulose derivatives and silicon metals, added about JPY 440.8 billion of sales and JPY 100.9 billion of operating income, and Processing and Specialized Services added about JPY 135.9 billion and JPY 27.3 billion. Roughly 79 percent of sales came from outside Japan, with the United States at about 28 percent and Asia and Oceania at about 35 percent.

Full SHECY guide

Westlake Corporation runs two segments. Performance and Essential Materials (PEM) is the commodity side: chlor-alkali and vinyls (chlorine, caustic soda, PVC resin), olefins (ethylene, polyethylene, styrene), plus epoxy and specialty chemicals sold into packaging, pipe, coatings and wind blades. Housing and Infrastructure Products (HIP) is the downstream side: PVC pipe and fittings, siding, trim, windows, decking and roofing sold to builders, distributors and big-box retail, much of it built on resin Westlake makes itself. That vertical integration is the whole design idea. The company captures margin at both the molecule and the finished-product stage, which softens (though never removes) the swing when resin prices move. The Chao family controls roughly 72% of the shares through family entities, so public holders own a minority float in a founder-controlled company.

Full WLK guide

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

• SHECY drivers: AI demand pulling the wafer business; Capital spending aimed at both legs.
• WLK drivers: The three-pillar self-help program; Vinyls and olefins pricing off a cyclical trough.

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: Group results are cyclical on both sides and the two cycles do not move together, so a strong wafer year can be offset by a weak resin year as it was in the year ended March 2026, when revenue was roughly flat but operating income fell about 14.4 percent. For WLK, the single biggest risk is that Q2 2026 was a price spike, not a floor: PEM's margin expansion was driven substantially by oil prices elevated on Middle East conflict, and if crude retreats while global PVC and polyethylene capacity stays long, the spread compresses fast.

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 SHECY if you believe its drivers more; WLK 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 SHECY and WLK guides.

SHECY. Because two ADRs equal one ordinary share, every per-share figure Shin-Etsu publishes has to be halved to reach a per-ADR number, then converted from yen. On trailing earnings of about JPY 257 per ordinary share against a Tokyo price near JPY 6,167, the multiple is roughly 24 times, and on the company's own FY2027 guidance of JPY 286.00 it is roughly 22 times. Net assets per share of about JPY 2,447 puts the price to book near 2.5 times. Yen figures should never be read as dollars: JPY 2,607.8 billion of revenue is roughly 16 billion US dollars at prevailing rates, not 2.6 trillion.

WLK. Trailing earnings are negative because of the 2025 write-downs, so the trailing P/E is meaningless and the market is pricing off forward estimates at roughly 22 times, plus about 4 times EV to a normalizing EBITDA run rate if the second-quarter pace held. The share count is about 128 million and the stock trades near $80 against a 52-week range of roughly $56 to $124, so it has bounced hard off the low without recovering the high. Cyclical chemical names look expensive on trough earnings and cheap on peak earnings, which is exactly the inversion to keep in mind here.

Headline figures (approximate, August 2026): SHECY shows revenue (ttm) ~JPY 2,607.8 billion, roughly JPY 2.6 trillion (about 16 billion US dollars at roughly JPY 160 per dollar), operating income (ttm) ~JPY 642.2 billion, a margin of roughly 24.6%, net income and eps (ttm) ~JPY 478.9 billion, about JPY 257 per ordinary share, roughly JPY 128 per ADR, fy2027 company guidance (year ending march 2027) Net sales ~JPY 2,700 billion (+4.9%), operating income ~JPY 700 billion (+10.2%), EPS ~JPY 286.00; WLK shows revenue (ttm) ~$11.3B, q2 2026 net sales / ebitda ~$3.27B / ~$679M, q2 2026 eps (diluted) ~$2.01, net income (ttm) ~-$1.2B (2025 impairments).

SHECY and WLK 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 SHECY and WLK exposure against your real portfolio. It is not an investment adviser.