Ionis Pharmaceuticals

IONSNASDAQUSD

THESIS ALERT

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$28.33
+$0.14 (+0.50%)Today 1M −37.74%
After hours$28.44+0.40%

Updated Nov 11, 4:00 PM ET · Regular session · May be delayed

Source valuation snapshot. Not a live recalculation.
Latest filed annual earnings; price snapshot date unavailable. Not forward P/E.
Diluted earnings per share from the latest filed annual.
$28.19
Prior regular-session close from the quote source.
$28.25–$29.42
Regular-session low and high so far today.
6.5M
Regular-session shares traded · Nov 11, 4:00 PM ET.
Not yet confirmed
The company has not confirmed its next report date. Reported quarters are available in the chart’s Earnings view.
$27.75–$86.74
52-week trading low and high returned by the quote source.

Understand the Business

Why the Stock Moved

Period-matched expectations history is not yet available. Current metrics are not a substitute for a historical explanation.

The core investment thesis

Own IONS if its serious-disease drug invention engine converts high-gross-margin science into repeatable commercial and partner economics before cash burn and balance-sheet pressure dilute the upside.

IONS price history

Latest price$28.33Today+$0.14 (+0.50%)
IONS -36.00%S&P 500 -2.42%Since first plotted close
4 hours

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Investment thesis

What must happen next

5 MATERIAL PROPOSITIONS
  • Ionis’s serious-disease drug-invention platform continues to generate partnerable or commercial assets, so revenue is replenished by new medicines and collaborations rather than dependent on one-time events.StrengtheningMateriality: High

    FY2025 GAAP annual revenue was $943.7 million, up from $705.1 million in FY2024. If this holds, Ionis can compound value through repeated pipeline monetization; if it breaks, the company becomes a cash-burning collection of aging or failed assets.

    Watch: Alnylam, gene-editing companies, or other RNA competitors show superior efficacy, safety, or dosing convenience in Ionis target areas before Ionis programs reach market.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    FY2025 GAAP annual revenue was $943.7 million, up from $705.1 million in FY2024.

    Open source ↗
  • Ionis’s economics remain driven by proprietary drug and intellectual-property value rather than low-margin manufacturing, allowing successful assets to carry very high gross contribution.StrengtheningMateriality: High

    FY2025 estimated annual gross profit was $927.8 million on FY2025 GAAP annual revenue of $943.7 million. High gross contribution gives the company a path to attractive margins if revenue scales; a lower-margin mix would require much more revenue to reach profitability.

    Watch: Revenue mix shifts materially toward wholly owned commercial products with higher manufacturing, distribution, rebate, and patient-support costs.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    FY2025 estimated annual gross profit was $927.8 million on FY2025 GAAP annual revenue of $943.7 million.

    Open source ↗
  • Ionis’s R&D and commercial infrastructure must become leverageable fixed capacity, not a permanently expanding cost base, as launches and partnerships scale.HoldingMateriality: Medium

    FY2025 GAAP annual operating income was a loss of $381.7 million, improved from a loss of $475.1 million in FY2024. The owner needs platform revenue to translate into operating profit, not just more pipeline spending.

    Watch: Ionis builds commercial and medical-affairs capacity faster than product uptake can support it.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    FY2025 GAAP annual operating income was a loss of $381.7 million, improved from a loss of $475.1 million in FY2024.

    Open source ↗
  • Partner funding and high-margin revenue must reduce operating cash burn fast enough for Ionis to fund its pipeline without value-destructive financing.HoldingMateriality: Medium

    FY2025 GAAP annual operating cash flow was negative $268.6 million, improved from negative $500.9 million in FY2024. If cash burn keeps improving, shareholders keep more of the pipeline upside; if not, dilution or balance-sheet stress can overwhelm scientific progress.

    Watch: Delayed approvals or partner milestones push expected cash receipts into later periods.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    FY2025 GAAP annual operating cash flow was negative $268.6 million, improved from negative $500.9 million in FY2024.

    Open source ↗
  • Ionis’s pipeline must mature before liabilities materially constrain strategic flexibility, because the company is not yet self-funding from profits.WeakeningMateriality: Medium

    Liabilities were $3.03 billion at FY2025, up from $2.42 billion at FY2024. Balance-sheet flexibility determines whether Ionis can keep funding high-value programs through setbacks without surrendering economics.

    Watch: Debt maturities, covenants, or refinancing needs force Ionis to raise capital before major pipeline value inflections.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    Liabilities were $3.03 billion at FY2025, up from $2.42 billion at FY2024.

    Open source ↗
Full investment case & evidence

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Original research

Ionis’s serious-disease drug-invention platform continues to generate partnerable or commercial assets, so revenue is replenished by new medicines and collaborations rather than dependent on one-time events. If this holds, Ionis can compound value through repeated pipeline monetization; if it breaks, the company becomes a cash-burning collection of aging or failed assets.

Ionis’s economics remain driven by proprietary drug and intellectual-property value rather than low-margin manufacturing, allowing successful assets to carry very high gross contribution. High gross contribution gives the company a path to attractive margins if revenue scales; a lower-margin mix would require much more revenue to reach profitability.

Ionis’s R&D and commercial infrastructure must become leverageable fixed capacity, not a permanently expanding cost base, as launches and partnerships scale. The owner needs platform revenue to translate into operating profit, not just more pipeline spending.

Partner funding and high-margin revenue must reduce operating cash burn fast enough for Ionis to fund its pipeline without value-destructive financing. If cash burn keeps improving, shareholders keep more of the pipeline upside; if not, dilution or balance-sheet stress can overwhelm scientific progress.

Ionis’s pipeline must mature before liabilities materially constrain strategic flexibility, because the company is not yet self-funding from profits. Balance-sheet flexibility determines whether Ionis can keep funding high-value programs through setbacks without surrendering economics.

All standing thesis claims
Original report summary

its serious-disease drug invention engine converts high-gross-margin science into repeatable commercial and partner economics before cash burn and balance-sheet pressure dilute the upside.

Evidence assessed Oct 26, 2026. Expand each conclusion for its evidence and what would change it. Thesis evidence—not a buy or sell recommendation.

Bull case and bear case

Bull case and bear case for Ionis Pharmaceuticals

Where the evidence on Ionis Pharmaceuticals disagrees: Mixed on the latest evidence (Oct 26, 2026). Of its 5 thesis points, 2 strengthening, 2 holding and 1 weakening.

Bull case: what the evidence supports

  • Ionis’s serious-disease drug-invention platform continues to generate partnerable or commercial assets, so revenue is replenished by new medicines and collaborations rather than dependent on one-time events.

    sec.gov ↗

  • Ionis’s economics remain driven by proprietary drug and intellectual-property value rather than low-margin manufacturing, allowing successful assets to carry very high gross contribution.

    sec.gov ↗

  • Ionis’s R&D and commercial infrastructure must become leverageable fixed capacity, not a permanently expanding cost base, as launches and partnerships scale.

    sec.gov ↗

  • Partner funding and high-margin revenue must reduce operating cash burn fast enough for Ionis to fund its pipeline without value-destructive financing.

    sec.gov ↗

Bear case: what the evidence questions

  • Ionis’s pipeline must mature before liabilities materially constrain strategic flexibility, because the company is not yet self-funding from profits.

    sec.gov ↗

Thesis-Break Engine

Thesis-break watch · Ionis Pharmaceuticals

Loading the break-condition record for Ionis Pharmaceuticals.

How the Thesis-Break Engine works →Historical outcomes are measured against the market after past breaks of the same kind, across all companies. Not a prediction.

MARKET + FINANCIAL SNAPSHOT

The numbers behind the thesis

Sourced from filings and market data

What Changed

  1. Mixed
    Regulation FD disclosure.

    Ionis Pharmaceuticals filed an SEC 8-K on 2026-10-23: Regulation FD disclosure. It is a dated development that tests the current thesis.

  2. Mixed
    Regulation FD disclosure.

    Ionis Pharmaceuticals filed an SEC 8-K on 2026-10-21: Regulation FD disclosure. It is a dated development that tests the current thesis.

  3. Mixed
    Regulation FD disclosure.

    Ionis Pharmaceuticals filed an SEC 8-K on 2026-09-23: Regulation FD disclosure. It is a dated development that tests the current thesis.

Risks / falsifiers

What could break the thesis

  • Alnylam, gene-editing companies, or other RNA competitors show superior efficacy, safety, or dosing convenience in Ionis target areas before Ionis programs reach market.
  • Revenue mix shifts materially toward wholly owned commercial products with higher manufacturing, distribution, rebate, and patient-support costs.
  • Ionis builds commercial and medical-affairs capacity faster than product uptake can support it.
  • Delayed approvals or partner milestones push expected cash receipts into later periods.
  • Debt maturities, covenants, or refinancing needs force Ionis to raise capital before major pipeline value inflections.

IONS news

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Financial statements

IONS income statement

Annual filed results · USD · Oldest to newest. Margins are calculated from the reported figures.

IONS: quick answers

Have members of Congress traded IONS?
10 trades in IONS have been disclosed under the STOCK Act by members of Congress, the President or senior officials, none in reports made public in the last 90 days. Every disclosed IONS trade
Which well-known investors own IONS?
1 of the 37 well-known funds tracked here reported IONS shares in their latest 13F filing. By share of the fund's portfolio: ARK Investment Management (Cathie Wood), 0.1%. Fund portfolios

IONS in well-known investors’ portfolios

1 of 37 funds reported IONS shares in their latest 13F filing. A 13F shows quarter-end positions and arrives up to 45 days later.

FundOf its portfolioValueChangeQuarter
Cathie WoodARK Investment Management0.15%$23.8M+4.2%Q2 2026

Every fund’s portfolio

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