BioSight
Back
IONIS PHARMACEUTICALS INC logo

IONS

NASDAQCARLSBAD, CA
IONIS PHARMACEUTICALS INC

Ionis Pharmaceuticals develops RNA-targeted medicines to treat serious genetic and neurological diseases. The company has transitioned to a fully integrated commercial-stage biotech with seven marketed medicines, including SPINRAZA for spinal muscular atrophy, WAINUA for hereditary transthyretin amyloidosis, QALSODY and TEGSEDI for ALS, and DAWNZERA for hereditary angioedema, among others. Most of these medicines are already approved and being commercialized in the U.S. and international markets, either independently or through partnerships with larger pharmaceutical companies.

$74.76+143.44%1Y
IONS · daily close · illustrative · 0 catalysts marked
1Y high$86.501Y low$30.71range$55.79(182%)past catalysts

Pipeline17

Phase 3Hereditary Angioedema

Donidalorsen is an ASO‑GalNAc conjugate that causes ribonuclease H1 (RNase H1)‑mediated degradation of PKK mRNA through binding to PKK mRNA, which results in reduced production of PKK protein.

small-molecule
Phase 3Hereditary Transthyretin-Mediated Amyloidosis With Polyneuropathy
Phase 3Transthyretin-Mediated Amyloid Cardiomyopathy (ATTR CM)

Eplontersen is an antisense oligonucleotide-GalNAc conjugate that causes degradation of mutant and wild-type TTR mRNA through binding to the TTR mRNA, which results in a reduction of serum TTR protein and TTR protein deposits in tissues.

small-molecule
Phase 3Amyotrophic Lateral Sclerosis
small-molecule
Phase 3Angelman Syndrome
small-molecule
Phase 3Severe Hypertriglyceridemia
Phase 3Familial Chylomicronemia Syndrome

Olezarsen is an ASO-GalNAc 3 conjugate that binds to apoC-III mRNA leading to mRNA degradation and resulting in a reduction of serum apoC-III protein. Reduction of apoC-III protein leads to increased clearance of plasma TG and VLDL.

small-molecule
Phase 3Alexander Disease
rna-therapy
Antisense oligonucleotide
Phase 3Alexander Disease
small-molecule
Phase 2Dravet Syndrome
small-molecule
Phase 2Methyl CpG Binding Protein 2 (MECP2) Duplication Syndrome
small-molecule
Phase 2Prion Disease
small-molecule
Phase 2Phlebotomy Dependent Polycythemia Vera
small-molecule
filedFamilial Chylomicronemia

Olezarsen is an ASO-GalNAc 3 conjugate that binds to apoC-III mRNA leading to mRNA degradation and resulting in a reduction of serum apoC-III protein. Reduction of apoC-III protein leads to increased clearance of plasma TG and VLDL.

rna-therapy
Antisense oligonucleotide
UnknownIndication pending review
UnknownIndication pending review
UnknownIndication pending review
UnknownIndication pending review
UnknownIndication pending review

Catalyst Calendar13

2026
164d ago
Readoutbepirovirsen
GSK is developing bepirovirsen, including conducting the ongoing B-Well Phase 3 program in patients with HBV, which achieved full enrollment in June 2024 and for which we anticipate data in 2026.
8-K
2026
164d ago
Readoutulefnersen
We are currently conducting a Phase 3 study of ulefnersen in juvenile and adult patients with FUS-ALS for which we anticipate data in 2026.
8-K
2026
164d ago
ReadoutWAINUA (eplontersen)
In July 2023, we completed enrollment of the Phase 3 CARDIO-TTRansform study of WAINUA in patients with ATTR-CM with data expected in 2026.
8-K
SEP 22
2026
100d
PDUFAzilganersen
Zilganersen is currently under Priority Review by the U.S. Food and Drug Administration with a Prescription Drug User Fee Act action date of September 22, 2026.
8-K
2028
566d
ReadoutQALSODY (tofersen)
Biogen is evaluating QALSODY as a potential treatment for presymptomatic SOD1-ALS patients in the ongoing ATLAS study for which we anticipate data in 2028.
8-K
Past (8)
DEC 19
2024
PDUFAolezarsen
In June 2024, the FDA accepted our NDA for patients with FCS for Priority Review with a Prescription Drug User Fee Act, or PDUFA, date of December 19, 2024.
8-K
2025
Readoutpelacarsen
Novartis is developing pelacarsen, including conducting the ongoing Lp(a) HORIZON Phase 3 cardiovascular outcome study in patients with elevated Lp(a)-driven cardiovascular disease, which achieved full enrollment in July 2022 with more than 8,000 patients and for which we anticipate data in 2025.
8-K
2025
Readoutzilganersen
In July 2024, we completed enrollment in the Phase 3 portion of the ongoing study for patients with AxD. We anticipate data from this study in 2025.
8-K
2025
Readoutolezarsen
we are currently conducting a broad Phase 3 development program for olezarsen for the treatment of sHTG, including three Phase 3 studies supporting development (CORE, CORE2 and ESSENCE), which achieved full enrollment in 2024 and for which we expect data in 2025.
8-K
SEP
2025
NDAolezarsen
We plan to submit a supplemental new drug application (sNDA) to the U.S. Food and Drug Administration by end of year.
8-K
NOV–NOV
2025
Conf.olezarsen
These data were presented during a late-breaking session at the American Heart Association Scientific Sessions, taking place November 7-10 in New Orleans, and simultaneously published in The New England Journal of Medicine.
8-K
Q1
'26
NDAzilganersen
We plan to submit a new drug application to the U.S. Food and Drug Administration in Q1 2026
8-K
APR 21
2026
Conf.zilganersen
These findings, which will be presented today at the 2026 American Academy of Neurology annual meeting, build on previously reported positive topline data and provide a more comprehensive view of treatment effect across multiple clinically meaningful domains.
8-K

Disclaimer·BioSight aggregates publicly available data (SEC EDGAR, ClinicalTrials.gov, FDA, company press releases) and is provided as is for informational purposes only. Nothing here is investment, financial, legal, tax, or medical advice, or an offer to buy or sell any security. We make no warranty as to accuracy, completeness, or timeliness; dates and filings may contain errors or be superseded without notice; past events do not predict future outcomes. To the maximum extent permitted by law, BioSight, its operators, contributors, and affiliates disclaim all liability for any loss or damage arising from use of or reliance on this site. You are solely responsible for your own investment decisions — consult a licensed professional before acting on any information.