COHR vs FN: Which Is the Better Buy in 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. COHR and FN 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 COHR and FN 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.

Coherent Corp, formerly II-VI and now trading as COHR on the NYSE, makes lasers, optical components, and high-speed transceivers used in AI data centers, telecom networks, industrial manufacturing, and semiconductors. Its largest and fastest-growing segment is Datacenter & Communications, which supplies the 800G and emerging 1.6T optical transceivers that connect GPUs and switches inside AI clusters, alongside a smaller Industrial segment covering lasers and materials.

Full COHR guide

Fabrinet is an outsourced manufacturing partner for companies that design complex optical and electro-mechanical products but do not want to build them. Its plants, concentrated in Thailand with additional sites in the United States, Israel, China and the United Kingdom, handle optical packaging, precision assembly and test for transceivers, lasers, sensors and interconnect modules. Customers are the optical component and networking vendors themselves, so Fabrinet's revenue tracks the aggregate volume shipped across the industry rather than the market share of any one designer. Recent annual filings have named Nvidia and Cisco among the customers exceeding 10% of revenue, and roughly 16,500 employees support the operation. The company is incorporated in the Cayman Islands, files with the SEC as a domestic filer and has traded on the NYSE since its 2010 IPO.

Full FN guide

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

• COHR drivers: AI datacom transceiver demand; Transition to 1.6T optics.
• FN drivers: Data center interconnect and telecom acceleration; Capacity is the constraint being removed.

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: COHR trades at a high earnings multiple, so any slowdown in AI capital spending or a demand air pocket could hit the stock hard. For FN, customer concentration is the structural weak point: a small set of customers each exceed 10% of revenue, and an insourcing decision or a design loss at one of them removes volume Fabrinet cannot easily replace.

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 COHR if you believe its drivers more; FN 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 COHR and FN guides.

COHR. Coherent's revenue has accelerated on AI datacenter optics demand, with the Datacenter & Communications segment making up about three quarters of sales. The stock carries a high trailing multiple that reflects rapid earnings growth expectations, so the valuation depends heavily on that growth continuing. Figures are approximate and shift with each quarterly report and market moves.

FN. Fabrinet trades at a software-adjacent multiple on hardware-assembly economics, which only reconciles if volume keeps compounding at the current rate. Fiscal Q4 guidance of roughly $1.25 billion to $1.29 billion implies about 40% year-over-year growth at the midpoint, and results are due around August 17, 2026. The forward multiple near 34 times already prices a good deal of that in.

Headline figures (approximate, July 2026): COHR shows revenue (ttm) ~$6.3B, q3 fy2026 revenue ~$1.81B (up ~21% YoY), q3 fy2026 non-gaap eps ~$1.41, q4 fy2026 revenue guidance ~$1.91B to $2.05B; FN shows revenue (ttm) ~$4.24 billion (up ~30% YoY), fiscal q3 2026 revenue ~$1.214 billion (up ~39% YoY, a record), net income (ttm) ~$421 million, EPS ~$11.64, market cap / p/e ~$20.2 billion, ~48x trailing and ~34x forward.

COHR and FN 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 COHR and FN exposure against your real portfolio. It is not an investment adviser.