Why Is Novartis Stock Falling Today? - Novartis (NYSE:NVS), Ionis Pharmaceuticals (NASDAQ:IONS), Royalty
Novartis (NYSE:NVS) stock fell sharply after Phase 3 HARBOR trial for del-desiran in myotonic dystrophy type 1 missed primary endpoint. The company also reported that the pelacarsen cardiovascular trial failed to meet its primary endpoint. Ionis Pharmaceuticals (NASDAQ:IONS) and Royalty Pharma (NASDAQ:RPRX) shares also declined due to the trial results. Novartis is evaluating the data and plans to discuss next steps with health authorities.
How this was made

The 30-second read
Why it matters
The negative data erodes confidence in Novartis' neuromuscular and lipid‑lowering pipelines, prompting immediate price corrections.
Market read
The news triggers a multi‑stock sell‑off in the biotech sector, with potential spill‑over to related therapeutic areas.
What to watch
Potential upcoming data from other AOC programs or regulatory discussions may mitigate the impact.
Background
Novartis disclosed two separate Phase 3 trial failures (HARBOR for DM1 and Lp(a)HORIZON for cardiovascular outcomes) leading to sharp stock declines across its own shares and those of partners Ionis and Royalty Pharma.
Ticker impact
Novartis shares fell 12.57% in pre‑market trading after its Phase 3 HARBOR trial missed the primary endpoint.
Further downside pressure if no mitigating news emerges.
Large‑cap stock, double‑digit move, and first disclosure of negative trial data make the impact clear.
Ionis Pharmaceuticals fell 9.80% as its pelacarsen partnership with Novartis delivered disappointing trial results.
Potential continued weakness pending clarification of partnership terms.
Direct exposure to the same trial outcome drives the move.
Royalty Pharma dropped 6.29% after the pelacarsen trial miss, affecting its royalty interest in the drug.
Likely further decline if trial data remains unfavorable.
Royalty holder directly impacted by the failed trial.
Market effects
Neuromuscular and cardiovascular biotech sectors face heightened risk perception.
European and US biotech indices may see short‑term pressure.
Large‑cap pharma stock moves influence broader market sentiment.
Counterpoint
If the company pivots to other pipeline assets, the sell‑off could be overdone.
Key entities
- companyNovartis AG
Swiss pharma giant reporting trial failures.
- companyIonis Pharmaceuticals
Partner holding rights to pelacarsen.
- companyRoyalty Pharma
Holder of royalty interests in pelacarsen.




