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Ionis Pharmaceuticals, Inc.

corporate_fare Company Profile

Ionis Pharmaceuticals, Inc.

IONS·NASDAQ·Life Sciences·CIK 0000874015

Our Company invents medicines for people with serious diseases, focusing on RNA-targeted therapies. We operate as a fully integrated commercial-stage biotechnology company with seven marketed medicines. TRYNGOLZA (olezarsen) is approved in the U.S. as an adjunct to diet to reduce triglycerides in adults with familial chylomicronemia syndrome (FCS), in the EU for patients with genetically confirmed FCS, and in Canada. It is the first FDA-approved treatment to significantly reduce triglyceride levels and provide clinically meaningful reduction in acute pancreatitis events in adults with FCS when used with an appropriate diet (≤20 grams of fat per day). We independently commercialize TRYNGOLZA in the U.S. DAWNZERA (donidalorsen) is approved in the U.S. for prophylaxis to prevent attacks of hereditary angioedema (HAE) in adult and pediatric patients 12 years of age and older, and in the EU for the routine prevention of recurrent attacks of HAE in the same age group. It is the first and only approved RNA-targeted prophylactic therapy for HAE. We independently commercialize DAWNZERA in the U.S. WAINUA (eplontersen) is approved in the U.S., EU, China, and numerous other countries for the treatment of the polyneuropathy of hereditary transthyretin-medicated amyloidosis (ATTRv-PN) in adults. WAINUA is the only approved medicine for ATTRv-PN that can be self-administered via an auto-injector. We and AstraZeneca co-develop WAINUA globally and co-commercialize it in the U.S. Our other marketed medicines include SPINRAZA (nusinersen), QALSODY (tofersen), TEGSEDI (inotersen), and WAYLIVRA (volanesorsen).

Ionis Pharmaceuticals, Inc. (NASDAQ:IONS) is a publicly traded company in the Life Sciences sector. Wiseek has independently scored 33 items for IONS at importance 7 or higher on its 1–10 market-impact scale. Its most recent item scored 7 or higher is dated 2026-09-23, rated 9/10. Across its 20 most recent items scored 7 or higher, the top rating is 9/10, with 18 rated 8 or above. Recent SEC coverage for IONS spans 8-K, 10-Q.

Recent high-impact activity:

  • Ionis' Sefaxersen Hits Primary Endpoint in Phase 3 IgAN Trial
  • Ionis/Otsuka ALS Drug Hits Primary Goal in Late-Stage Trial
  • Ionis Partner Novartis' Pelacarsen Fails Phase 3 Cardiovascular Outcomes Trial
  • FDA Approves ZANVASTRO for Alexander Disease; Ionis Secures Priority Review Voucher
  • FDA Approves Ionis' Zilganersen for Rare Alexander Disease

Financial Snapshot

Fiscal year ended December 31, 2025
Revenue
$943.71M
Net Income
-$381.39M
Diluted EPS
-$2.38
Op. Cash Flow
-$268.58M
Free Cash Flow
-$320.03M
Gross Profit
$927.8M
Operating Income
-$381.68M
Cash & Equivalents
$372.26M
Total Debt
$28.12M
Debt / Equity
0.06×
Net Margin
-40.4%
Shares Outstanding
163.3M sh
Source: 10-K · filed 2026-02-26 · accession 0000874015-26-000115

Short Interest & Short Volume

5.20 days to cover

FINRA reported short interest of 20,890,252 shares in IONS as of the September 15, 2026 settlement, a 0.2% decrease from the prior period — about 5.2 days to cover at its recent average daily volume. On October 2, 2026, 33.2% of IONS volume reported to FINRA trade-reporting facilities was marked short.

Short interest (bi-monthly positions)20,890,252 shares as of September 15, 2026
Change vs prior period▼ 0.2%
Days to cover5.20 at avg daily volume of 4,017,153
Daily short volume (FINRA facilities)33.2% of 862,139 shares on October 2, 2026
5-day average short volume27.8%

Daily short sale volume covers trades reported to FINRA trade-reporting facilities and is not the same as short interest (bi-monthly reported positions). Source: FINRA — FINRA is the owner and source of this short interest and short sale volume data; it may not be redistributed.

Dilution Risk

Low risk

Filing-implied dilution signals for IONS, detected from its recent SEC filings · based on capital-structure filings through 2026-04-23.

Proposed Equity Incentive Plan Expansion · Employee Stock Purchase Plan Increase

⚠ A more recent filing has been published for this ticker since this signal was computed; it may not yet be reflected — see the filings below.

A filing-implied signal, not a realized share count. How Wiseek tracks dilution →

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$43.61 +0.07% today
52-week range · as of 2026-09-04 $43.61 – $86.74
Market cap
$7.24B
Volume
2.3M (0.6× avg)
3-mo avg 3.8M
Live data · 2026-10-05 03:35 UTC · Market closed

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feed IONS - Latest Insights

IONS
Sep 23, 2026, 1:00 AM EDT
Source: BusinessWire
Importance Score:
9
Price at Filing: $45.75
Real-time Price: $43.61 info
Change: -$2.14 (-5%) info
Market Cap: $7.236B info
IONS
Sep 22, 2026, 8:36 AM EDT
Source: Reuters
Importance Score:
9
Price at Filing: $46.42
Real-time Price: $43.61 info
Change: -$2.81 (-6%) info
Market Cap: $7.236B info
IONS
Sep 04, 2026, 4:41 PM EDT
Source: BusinessWire
Importance Score:
9
Price at Filing: $54.00
Real-time Price: $43.61 info
Change: -$10.39 (-19%) info
Market Cap: $7.236B info
IONS
Sep 04, 2026, 6:01 AM EDT
Filing Type: 8-K
Importance Score:
9
Price at Filing: $59.00
Real-time Price: $43.61 info
Change: -$15.39 (-26%) info
Market Cap: $7.236B info
IONS
Sep 03, 2026, 4:02 PM EDT
Source: Reuters
Importance Score:
9
Price at Filing: $58.13
Real-time Price: $43.61 info
Change: -$14.52 (-25%) info
Market Cap: $7.236B info
IONS
Jul 29, 2026, 5:05 PM EDT
Filing Type: 10-Q
Importance Score:
8
Price at Filing: $53.06
Real-time Price: $43.61 info
Change: -$9.45 (-18%) info
Market Cap: $7.236B info
IONS
Jul 29, 2026, 7:31 AM EDT
Filing Type: 8-K
Importance Score:
7
Price at Filing: $56.49
Real-time Price: $43.61 info
Change: -$12.88 (-23%) info
Market Cap: $7.236B info
IONS
Jul 29, 2026, 7:00 AM EDT
Source: BusinessWire
Importance Score:
8
Price at Filing: $56.09
Real-time Price: $43.61 info
Change: -$12.48 (-22%) info
Market Cap: $7.236B info
IONS
Jul 09, 2026, 2:55 PM EDT
Filing Type: 8-K
Importance Score:
9
Price at Filing: $64.50
Real-time Price: $43.61 info
Change: -$20.89 (-32%) info
Market Cap: $7.236B info
IONS
Jul 09, 2026, 2:10 AM EDT
Source: Reuters
Importance Score:
9
Price at Filing: $86.14
Real-time Price: $43.61 info
Change: -$42.53 (-49%) info
Market Cap: $7.236B info
IONS
Jun 30, 2026, 6:00 AM EDT
Source: Reuters
Importance Score:
8
Price at Filing: $81.00
Real-time Price: $43.61 info
Change: -$37.39 (-46%) info
Market Cap: $7.236B info
IONS
Jun 26, 2026, 3:13 AM EDT
Source: Wiseek News
Importance Score:
7
Price at Filing: $78.60
Real-time Price: $43.61 info
Change: -$34.99 (-45%) info
Market Cap: $7.236B info
IONS
Jun 25, 2026, 3:01 AM EDT
Source: Reuters
Importance Score:
8
Price at Filing: $78.00
Real-time Price: $43.61 info
Change: -$34.39 (-44%) info
Market Cap: $7.236B info
IONS
Jun 24, 2026, 3:48 PM EDT
Filing Type: 8-K
Importance Score:
9
Price at Filing: $77.04
Real-time Price: $43.61 info
Change: -$33.43 (-43%) info
Market Cap: $7.236B info
IONS
Jun 24, 2026, 12:54 PM EDT
Source: Reuters
Importance Score:
9
Price at Filing: $76.98
Real-time Price: $43.61 info
Change: -$33.37 (-43%) info
Market Cap: $7.236B info
IONS
Jun 12, 2026, 2:23 PM EDT
Source: Wiseek News
Importance Score:
8
Price at Filing: $73.24
Real-time Price: $43.61 info
Change: -$29.63 (-40%) info
Market Cap: $7.236B info
IONS
Jun 12, 2026, 2:20 PM EDT
Filing Type: 8-K
Importance Score:
8
Price at Filing: $73.19
Real-time Price: $43.61 info
Change: -$29.58 (-40%) info
Market Cap: $7.236B info
IONS
Jun 08, 2026, 12:49 PM EDT
Filing Type: 8-K
Importance Score:
8
Price at Filing: $73.76
Real-time Price: $43.61 info
Change: -$30.15 (-41%) info
Market Cap: $7.236B info
IONS
Jun 05, 2026, 3:13 AM EDT
Source: Wiseek News
Importance Score:
9
Price at Filing: $75.20
Real-time Price: $43.61 info
Change: -$31.59 (-42%) info
Market Cap: $7.236B info
IONS
May 28, 2026, 12:41 PM EDT
Filing Type: 8-K
Importance Score:
9
Price at Filing: $77.64
Real-time Price: $43.61 info
Change: -$34.03 (-44%) info
Market Cap: $7.236B info
Research tools: Filing Impact Index Dilution Tracker Split Calendar Open Datasets