OABI vs REGN: 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. OABI and REGN 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 OABI and REGN 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.

OmniAb was spun out of Ligand Pharmaceuticals in November 2022 and sells access to antibody discovery technology rather than drugs. Its platform centres on transgenic animals engineered to produce human-sequence antibodies (OmniRat, OmniMouse, OmniChicken, OmniTaur, OmniClic) plus the xPloration high-throughput single-cell screening system and an ion channel screening group acquired with Icagen. Partners license the platforms, run their own discovery campaigns, and owe OmniAb payments at defined points: an upfront or annual access fee, service and instrument revenue, clinical and regulatory milestones, and a royalty on eventual product sales. As of Q2 2026 there were ~110 active partners, ~425 active programs, ~34 of those in clinical development or already approved, eight of the ten largest pharma companies among the partner base, and roughly 98% of programs carrying contracted future economics. Management has cited more than ~$3B of total contracted milestone potential at an average royalty near ~3.4%.

Full OABI guide

Regeneron makes money primarily through two large franchises. Dupixent, an anti-inflammatory antibody used for eczema, asthma, COPD, and other conditions, is developed and commercialized in collaboration with Sanofi, and Regeneron records its share through Sanofi collaboration revenue (about $1.6 billion in Q1 2026, up roughly 36%). Eylea and the higher-dose Eylea HD treat retinal diseases such as wet age-related macular degeneration and diabetic eye disease, generating combined U.S. net product sales of about $941 million in Q1 2026, with Eylea HD now roughly half of that mix. Libtayo in oncology and a pipeline of nearly 50 clinical candidates round out the revenue base.

Full REGN guide

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

• OABI drivers: Clinical graduation across ~34 partner programs; Milestone revenue reaching operating breakeven.
• REGN drivers: Dupixent keeps compounding; A deep, diversified pipeline.

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: Revenue is lumpy by construction: management has said milestone revenue can vary materially between quarters and that 2026 activity is front-loaded, so a strong Q2 is not a run rate. For REGN, the clearest risk is Eylea biosimilar erosion.

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 OABI if you believe its drivers more; REGN 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 OABI and REGN guides.

OABI. A ~12.8x multiple on ~$38M of trailing revenue is a platform multiple, not a biotech-pipeline multiple, and it reflects contracted future economics rather than current profit. Two figures pull against each other: the milestone line tripled year over year while the royalty line was ~$0.3M for the quarter, so the near-term earnings power comes from stage payments rather than product sales. Cash of ~$52M with essentially no debt and first-half operating burn of ~$2.2M means the balance sheet is not the pressing question at these levels; the timing of partner programs is.

REGN. Figures are approximate and tied to the asOf date; verify current numbers with a live quote before acting. Regeneron reported about 19% revenue growth and adjusted EPS of roughly $9.47 in Q1 2026, beating estimates, and authorized an additional $3 billion buyback. The mid-teens P/E reflects the market weighing strong Dupixent growth against expected Eylea biosimilar erosion.

Headline figures (approximate, August 2026): OABI shows revenue (ttm) ~$38M, q2 2026 revenue ~$13.4M, up from ~$3.9M a year earlier, 2026 revenue guidance ~$32M to ~$36M, net loss ~$5.9M in Q2 2026, ~$44M trailing twelve months; REGN shows total revenue (ttm, approx) ~$14 billion, q1 2026 total revenue ~$3.6 billion (up ~19% YoY), dupixent global net sales (q1 2026) ~$4.9 billion (up ~31%), eylea + eylea hd u.s. net sales (q1 2026) ~$941 million combined.

OABI and REGN 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 OABI and REGN exposure against your real portfolio. It is not an investment adviser.