Full Press Release Details
Ionis reports third quarter 2025 financial results and highlights progress on key programs
- TRYNGOLZA generated $32 million in net product sales in the third quarter 2025 -
- DAWNZERA (donidalorsen) launch off to encouraging start -
- Olezarsen significantly reduced triglycerides and acute pancreatitis events in severe hypertriglyceridemia (sHTG) in landmark
Phase 3 studies; sNDA submission on track by year-end -
- Positive pivotal zilganersen results in Alexander disease position Ionis for first independent neurology launch in 2026 -
- Increasing 2025 financial guidance driven by continued strength across the business -
CARLSBAD, Calif., October 29, 2025 - Ionis Pharmaceuticals, Inc. (Nasdaq: IONS) (the "Company") today reported financial results and provided key updates for the third quarter ended September 30, 2025.
"The third quarter was a watershed moment for Ionis, as we made important progress advancing our Ionis-owned medicines. With two independent launches now underway, and
two more anticipated in 2026, we are delivering on our goal to bring a steady cadence of new medicines to people in need," said Brett P. Monia, Ph.D., chief executive officer of Ionis. "Last month, we announced groundbreaking, positive topline
Phase 3 results for olezarsen in severe hypertriglyceridemia and for zilganersen in Alexander disease, with regulatory filings planned in the coming months. Our approved and late-stage portfolio continues to deliver - positioning Ionis for
substantial growth while, most importantly, offering the opportunity to profoundly improve the lives of people with serious diseases."
Third Quarter 2025 Summary Financial Results(1):
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| September 30, | September 30, | |||||||||||||||
| 2025 | 2024 | 2025 | 2024 | |||||||||||||
| (amounts in millions) | ||||||||||||||||
| Total revenue | $ | 157 | $ | 134 | $ | 740 | $ | 479 | ||||||||
| Operating expenses | $ | 317 | $ | 282 | $ | 907 | $ | 843 | ||||||||
| Operating expenses on a non-GAAP basis | $ | 286 | $ | 250 | $ | 816 | $ | 749 | ||||||||
| Loss from operations | $ | (160 | ) | $ | (148 | ) | $ | (167 | ) | $ | (364 | ) | ||||
| Loss from operations on a non-GAAP basis | $ | (129 | ) | $ | (116 | ) | $ | (76 | ) | $ | (270 | ) |
Recent Financial Highlights
| Full Year 2025 Guidance | Previous Guidance | New Guidance | |
| Total Revenue | $825-850 million | $875-900 million | |
| TRYNGOLZA product sales, net | $75-80 million | $85-95 million | |
| Operating loss on a non-GAAP basis | $300-325 million | $275-300 million | |
| Cash, cash equivalents and short-term investments | ~$2.0 billion | >$2.1 billion |
Third Quarter 2025 Financial Results
"In the third quarter of 2025, we delivered strong revenue performance, highlighted by TRYNGOLZA's nearly 70% increase over the prior quarter. As a result of this
strength and our fourth quarter outlook, we are increasing our financial guidance again for 2025," said Elizabeth L. Hougen, chief financial officer of Ionis. "Looking ahead, we expect the 2026 independent launches of olezarsen in severe
hypertriglyceridemia and zilganersen in Alexander disease to further strengthen our commercial portfolio. We anticipate that growth in our product revenues coupled with additional partner revenues will position Ionis to achieve cash flow breakeven
in 2028 and generate substantial and sustainable positive cash flow for years to come."
Recent Highlights - Wholly Owned Medicines
Recent Highlights - Partnered Medicines
Ionis' revenue was comprised of the following:
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| 2025 | 2024 | 2025 | 2024 | |||||||||||||
| Revenue: | (amounts in millions) | |||||||||||||||
| Commercial revenue: | ||||||||||||||||
| Product sales, net: | ||||||||||||||||
| TRYNGOLZA sales, net | $ | 32 | $ | - | $ | 57 | $ | - | ||||||||
| Total product sales, net | 32 | - | 57 | - | ||||||||||||
| Royalty revenue: | ||||||||||||||||
| SPINRAZA royalties | 56 | 57 | 158 | 152 | ||||||||||||
| WAINUA royalties | 13 | 5 | 33 | 10 | ||||||||||||
| Other royalties | 7 | 5 | 19 | 17 | ||||||||||||
| Total royalty revenue | 76 | 67 | 210 | 179 | ||||||||||||
| Other commercial revenue | 8 | 9 | 27 | 28 | ||||||||||||
| Total commercial revenue | 116 | 76 | 294 | 207 | ||||||||||||
| Research and development revenue: | ||||||||||||||||
| Collaborative agreement revenue | 31 | 45 | 414 | 237 | ||||||||||||
| WAINUA joint development revenue | 10 | 13 | 32 | 35 | ||||||||||||
| Total research and development revenue | 41 | 58 | 446 | 272 | ||||||||||||
| Total revenue | $ | 157 | $ | 134 | $ | 740 | $ | 479 |
Commercial revenue for the third quarter and the nine months ended September 30, 2025, increased 53% and 42%, respectively, compared to the same periods in 2024. This
increase was primarily driven by TRYNGOLZA product sales. Higher royalty revenue also contributed to the year over year increase.
The remainder of the Company's revenue came from programs under its R&D collaborations, including a $280 million upfront payment for the global license of
sapablursen to Ono Pharmaceutical Co., Ltd. in the second quarter of 2025, reflecting the value that Ionis' pipeline and technology continues to generate.
SG&A expenses increased as anticipated for the third quarter and the nine months ended September 30, 2025, compared to the same periods in 2024, primarily due to
the launches of TRYNGOLZA, DAWNZERA and WAINUA. This increase was partially offset by a decrease in R&D expenses as several late-stage studies ended. Overall, this led to a modest year-over-year increase in total operating expenses, which was
in line with expectations.
As of September 30, 2025, Ionis' cash, cash equivalents and short-term investments were $2.2 billion, compared to $2.3 billion on December
31, 2024. Ionis' working capital decreased over the same period primarily due to the reclassification of the Company's 0% convertible notes as a current liability.
Webcast and Other Updates
Management will host a conference call and webcast to discuss Ionis' third quarter 2025 results at 11:30 a.m. Eastern time on Wednesday, October 29, 2025. Interested
parties may access the webcast here. A webcast replay will be available for a limited time at the same address. To access the Company's third quarter 2025 earnings slides click here.
Ionis' Marketed Medicines
INDICATION for TRYNGOLZA (olezarsen)
TRYNGOLZA (olezarsen) was approved by the U.S.
Food and Drug Administration as an adjunct to diet to reduce triglycerides in adults with familial chylomicronemia syndrome (FCS).
IMPORTANT SAFETY INFORMATION
TRYNGOLZA is contraindicated in patients with a history of serious hypersensitivity to TRYNGOLZA or any of the excipients in TRYNGOLZA. Hypersensitivity reactions
requiring medical treatment have occurred.
WARNINGS AND PRECAUTIONS
Hypersensitivity Reactions
Hypersensitivity reactions (including symptoms of bronchospasm, diffuse erythema, facial swelling, urticaria, chills and myalgias) have been reported in patients treated
with TRYNGOLZA. Advise patients on the signs and symptoms of hypersensitivity reactions and instruct patients to promptly seek medical attention and discontinue use of TRYNGOLZA if hypersensitivity reactions occur.
The most common adverse reactions (incidence >5% of TRYNGOLZA-treated patients and >3% higher frequency than placebo) were injection site reactions, decreased
platelet count and arthralgia.
Please see full Prescribing Information for TRYNGOLZA.
INDICATION for DAWNZERATM (donidalorsen)
DAWNZERA (donidalorsen) was approved by the U.S. Food and Drug Administration for prophylaxis to prevent attacks of hereditary angioedema (HAE) in adult and pediatric
patients 12 years of age and older.
IMPORTANT SAFETY INFORMATION
DAWNZERA is contraindicated in patients with a history of serious hypersensitivity reactions, including anaphylaxis, to donidalorsen or any of the excipients in DAWNZERA.
WARNINGS AND PRECAUTIONS
Hypersensitivity Reactions
Hypersensitivity reactions, including anaphylaxis, have been reported in patients treated with DAWNZERA. If signs and symptoms of serious hypersensitivity reactions
occur, discontinue DAWNZERA and institute appropriate therapy.
Most common adverse reactions (incidence 5%) are injection site reactions, upper respiratory tract infection, urinary tract infection, and abdominal discomfort.
Please see full Prescribing Information for DAWNZERA.
INDICATION for WAINUA (eplontersen)
WAINUA injection, for subcutaneous use, 45 mg is indicated for the treatment of the polyneuropathy of hereditary transthyretin-mediated amyloidosis in adults.
IMPORTANT SAFETY INFORMATION for WAINUA (eplontersen)
WARNINGS AND PRECAUTIONS
Reduced Serum Vitamin A Levels and Recommended Supplementation WAINUA leads to a decrease in serum vitamin A levels. Supplement with recommended daily allowance of vitamin A. Refer patient to an ophthalmologist if ocular symptoms suggestive of vitamin
Most common adverse reactions ( 9% in WAINUA-treated patients) were vitamin A decreased (15%) and vomiting (9%).
Please see link to U.S. Full Prescribing Information for WAINUA.
For more information about SPINRAZA and QALSODY, visit https://www.spinraza.com/ and https://www.qalsody.com/, respectively. QALSODY is approved under
accelerated approval based on reduction in plasma neurofilament light chain (NfL) observed in patients treated with QALSODY. Continued approval may be contingent upon verification of clinical benefit in confirmatory trial(s).
About Ionis Pharmaceuticals, Inc.
For three decades, Ionis has invented medicines that bring better futures to people with serious diseases. Ionis currently has marketed medicines and a leading
pipeline in neurology, cardiometabolic disease and select areas of high patient need. As the pioneer in RNA-targeted medicines, Ionis continues to drive innovation in RNA therapies in addition to advancing new approaches in gene editing. A deep
(Twitter), LinkedIn and Instagram.
Ionis' Forward-looking Statement
This press release includes forward-looking statements regarding Ionis' business, financial guidance and the therapeutic and commercial potential of our commercial
medicines, additional medicines in development, technologies and our expectations regarding development and regulatory milestones. Any statement describing Ionis' goals, expectations, financial or other projections, intentions or beliefs is a
forward-looking statement and should be considered an at-risk statement. Such statements are subject to certain risks and uncertainties including those inherent in the process of discovering, developing and commercializing medicines that are safe
and effective for use as human therapeutics, and in the endeavor of building a business around such medicines. Ionis' forward-looking statements also involve assumptions that, if they never materialize or prove correct, could cause its results to
differ materially from those expressed or implied by such forward-looking statements. Although Ionis' forward-looking statements reflect the good faith judgment of its management, these statements are based only on facts and factors currently known
by Ionis. Except as required by law, we undertake no obligation to update any forward-looking statements for any reason. As a result, you are cautioned not to rely on these forward-looking statements. These and other risks concerning Ionis'
programs are described in additional detail in Ionis' annual report on Form 10-K for the year ended December 31, 2024, and most recent Form 10-Q, which are on file with the Securities and Exchange Commission. Copies of these and other documents are
available from the Company.
In this press release, unless the context requires otherwise, "Ionis," "Company," "we," "our" and "us" all refer to Ionis Pharmaceuticals and its subsidiaries.
IONIS is a registered trademark of Ionis Pharmaceuticals, Inc. TRYNGOLZA is a registered trademark of Ionis Pharmaceuticals, Inc. DAWNZERATM
is a trademark of Ionis Pharmaceuticals, Inc. AKCEATM is a trademark of Akcea Therapeutics, Inc. TEGSEDITM is a trademark of Akcea Therapeutics, Inc. WAYLIVRATM is a trademark of Akcea Therapeutics, Inc. SPINRAZA
and QALSODY are registered trademarks of Biogen. WAINUA is a registered trademark of the AstraZeneca group of companies.
Ionis Investor Contact:
D. Wade Walke, Ph.D.
Ionis Media Contact:
IONIS PHARMACEUTICALS, INC.
SELECTED FINANCIAL INFORMATION
Condensed Consolidated Statements of Operations
(In Millions, Except Per Share Data)
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| September 30, | September 30, | |||||||||||||||
| 2025 | 2024 | 2025 | 2024 | |||||||||||||
| (unaudited) | ||||||||||||||||
| Revenue: | ||||||||||||||||
| Commercial revenue: | ||||||||||||||||
| Product sales, net | $ | 32 | $ | - | $ | 57 | $ | - | ||||||||
| Royalty revenue | 76 | 67 | 210 | 179 | ||||||||||||
| Other commercial revenue | 8 | 9 | 27 | 28 | ||||||||||||
| Total commercial revenue | 116 | 76 | 294 | 207 | ||||||||||||
| Research and development revenue: | ||||||||||||||||
| Collaborative agreement revenue | 31 | 45 | 414 | 237 | ||||||||||||
| WAINUA joint development revenue | 10 | 13 | 32 | 35 | ||||||||||||
| Total research and development revenue | 41 | 58 | 446 | 272 | ||||||||||||
| Total revenue | 157 | 134 | 740 | 479 | ||||||||||||
| Expenses: | ||||||||||||||||
| Cost of sales | 2 | 1 | 8 | 7 | ||||||||||||
| Research, development and patent | 218 | 220 | 636 | 656 | ||||||||||||
| Selling, general and administrative | 97 | 61 | 263 | 180 | ||||||||||||
| Total operating expenses | 317 | 282 | 907 | 843 | ||||||||||||
| Loss from operations | (160 | ) | (148 | ) | (167 | ) | (364 | ) | ||||||||
| Other income (expense): | ||||||||||||||||
| Interest expense related to the sale of future royalties | (18 | ) | (19 | ) | (55 | ) | (55 | ) | ||||||||
| Other income, net | 49 | 23 | 70 | 66 | ||||||||||||
| Loss before income tax benefit | (129 | ) | (144 | ) | (152 | ) | (353 | ) | ||||||||
| Income tax benefit | - | 4 | - | 3 | ||||||||||||
| Net loss | $ | (129 | ) | $ | (140 | ) | $ | (152 | ) | $ | (350 | ) | ||||
| Basic and diluted net loss per share | $ | (0.80 | ) | $ | (0.95 | ) | $ | (0.95 | ) | $ | (2.38 | ) | ||||
| Shares used in computing basic and diluted net loss per share | 160 | 149 | 159 | 147 |
IONIS PHARMACEUTICALS, INC.
Reconciliation of GAAP to Non-GAAP Basis:
Condensed Consolidated Operating Expenses, Loss From Operations, and Net Loss
| Three months ended September 30, | Nine months ended September 30, | |||||||||||||||
| 2025 | 2024 | 2025 | 2024 | |||||||||||||
| (unaudited) | ||||||||||||||||
| As reported research, development and patent expenses according to GAAP | $ | 218 | $ | 220 | $ | 636 | $ | 656 | ||||||||
| Excluding compensation expense related to equity awards | (21 | ) | (22 | ) | (61 | ) | (67 | ) | ||||||||
| Non-GAAP research, development and patent expenses | $ | 197 | $ | 198 | $ | 575 | $ | 589 | ||||||||
| As reported selling, general and administrative expenses according to GAAP | $ | 97 | $ | 61 | $ | 263 | $ | 180 | ||||||||
| Excluding compensation expense related to equity awards | (10 | ) | (10 | ) | (29 | ) | (26 | ) | ||||||||
| Non-GAAP selling, general and administrative expenses | $ | 87 | $ | 51 | $ | 234 | $ | 154 | ||||||||
| As reported operating expenses according to GAAP | $ | 317 | $ | 282 | $ | 907 | $ | 843 | ||||||||
| Excluding compensation expense related to equity awards | (31 | ) | (32 | ) | (91 | ) | (94 | ) | ||||||||
| Non-GAAP operating expenses | $ | 286 | $ | 250 | $ | 816 | $ | 749 | ||||||||
| As reported loss from operations according to GAAP | $ | (160 | ) | $ | (148 | ) | $ | (167 | ) | $ | (364 | ) | ||||
| Excluding compensation expense related to equity awards | (31 | ) | (32 | ) | (91 | ) | (94 | ) | ||||||||
| Non-GAAP loss from operations | $ | (129 | ) | $ | (116 | ) | $ | (76 | ) | $ | (270 | ) | ||||
| As reported net loss according to GAAP | $ | (129 | ) | $ | (140 | ) | $ | (152 | ) | $ | (350 | ) | ||||
| Excluding compensation expense related to equity awards and related tax effects | (31 | ) | (32 | ) | (91 | ) | (94 | ) | ||||||||
| Non-GAAP net loss | $ | (98 | ) | $ | (108 | ) | $ | (61 | ) | $ | (256 | ) |