CRSP vs RARE: How CRISPR Therapeutics AG and Ultragenyx Pharmaceutical Compare (2026)

Same yardstick, side by side (as of July 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. CRSP and RARE 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 CRSP and RARE 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.

CRISPR Therapeutics AG is a Swiss-American biopharmaceutical company headquartered in Zug, Switzerland, with principal research operations in Boston, Massachusetts. The company uses its proprietary CRISPR/Cas9 platform to develop gene-based medicines across hemoglobinopathies, oncology, cardiovascular disease, autoimmune conditions, and regenerative medicine. Its first and only commercialized product, Casgevy, is co-developed and co-commercialized with Vertex Pharmaceuticals under a 40/60 profit-sharing structure in which CRISPR retains 40 percent of profits. Revenue has historically been driven by collaboration milestone payments from Vertex rather than product sales, making the financial profile highly lumpy. Beyond Casgevy, the company generates no meaningful product revenue today and funds operations through its cash reserves.

Full CRSP guide

Ultragenyx Pharmaceutical (NASDAQ: RARE) develops and sells treatments for rare and ultra-rare genetic diseases, conditions with small patient populations and often no approved therapy. Its commercial base includes Crysvita for X-linked hypophosphatemia (its largest product), Dojolvi for long-chain fatty acid oxidation disorders, Evkeeza, and Mepsevii, which together produced about $673 million of revenue in 2025. The company spans multiple modalities, protein-replacement, small molecule, antisense, and gene therapy, and is preparing several late-stage programs for potential approval.

Full RARE guide

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

• CRSP drivers: First-Mover Advantage in Commercial Gene Editing; Casgevy's Long-Term Revenue Potential.
• RARE drivers: Near-term gene therapy approvals; Angelman syndrome readout.

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: The commercial ramp of Casgevy has been far slower than early projections, with the therapy generating only approximately $3.5 million in revenue in all of 2025, down sharply from prior years that were boosted by one-time milestone payments. For RARE, ultragenyx remains unprofitable, with a net loss of about $575 million in 2025 and roughly $737 million of cash as of December 2025, so continued spending or delayed approvals could pressure the balance sheet and raise dilution or financing risk.

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 CRSP if you believe its drivers more; RARE 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 CRSP and RARE guides.

CRSP. Because CRISPR Therapeutics has no meaningful product profits yet, traditional earnings-based valuation multiples like P/E are negative and not analytically useful. The company is better evaluated on its cash runway, the pace of Casgevy's commercial adoption, and the risk-adjusted value of its pipeline. Enterprise value of roughly $2.8 billion (market cap less net cash) reflects the market pricing in significant execution uncertainty around both the Casgevy ramp and the broader pipeline, while a wide spread exists between bearish analyst targets near $33 and optimistic targets above $80.

RARE. Ultragenyx trades at a modest multiple of revenue for a biopharma but has no earnings, so conventional P/E valuation does not apply. The market is effectively pricing the pipeline and the credibility of the 2027 profitability goal. Guidance for 2026 revenue is $730 million to $760 million, which excludes any potential new product launches.

Headline figures (approximate, June 27, 2026 (data reflects most recently available reports through mid-2026)): CRSP shows revenue (full year 2025, product only) ~$3.5 million, revenue (full year 2024) ~$37.3 million (primarily collaboration revenue), net loss (ttm through q3 2025) ~$488 million, operating loss (full year 2025) ~$665 million; RARE shows revenue (ttm) ~$670M, fy2025 revenue ~$673M (up ~20%), q1 2026 revenue ~$136M, fy2025 net loss ~$575M.

CRSP and RARE 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 CRSP and RARE exposure against your real portfolio. It is not an investment adviser.