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I

Ionis Pharmaceuticals IONS · USD

Health Care · US listing · 🇺🇸 United States

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31.00

-21.36%

Close of 9 Nov 2026, in USD

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Largest shareholders

As filed, so dates differ, and a group and its funds can both appear.

HolderSharesStakeChangeFiled
FMR LLC24.6m15.35%+484.5k31 Mar 2026
Fidelity Management & Research Company LLC24.1m15.04%+383.1k31 Dec 2025
CAPITAL WORLD INVESTORS21.2m13.24%+3.2m31 Mar 2026
Capital World Investors18m11.23%+5.2m31 Dec 2025
The Vanguard Group, Inc.16.4m10.25%−41.3k31 Dec 2025
BLACKROCK, INC.10.4m6.53%−205.4k31 Mar 2026
T. Rowe Price Investment Management, Inc.9.1m5.69%−4m31 Dec 2025
BlackRock Institutional Trust Company, N.A.8.6m5.40%+180.4k31 Dec 2025
VANGUARD PORTFOLIO MANAGEMENT LLC7.8m4.88%+7.8m31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC7.1m4.45%+7.1m31 Mar 2026
WELLINGTON MANAGEMENT GROUP LLP6.4m3.99%+131.5k31 Mar 2026
Wellington Management Company, LLP6.3m3.91%−328.5k31 Dec 2025
T. ROWE PRICE INVESTMENT MANAGEMENT, INC.6.2m3.85%−2.9m31 Mar 2026
TWO SIGMA INVESTMENTS, LP5.9m3.66%+3.2m31 Mar 2026
Two Sigma Investments, LP5.7m3.58%+2.1m31 Dec 2025

Insider trades

Purchases and sales by directors and officers, as filed with the regulator

DateWhoTypeSharesPriceValue
2 Apr 2026 ↗Devers Shannon L.EVP, Chief Human Resources OfcSale6.2k74.05$458,613
1 Apr 2026 ↗KLEIN JOSEPH IIIDirectorSale22.3k75.55$1.7m
19 Mar 2026 ↗Schneider EugeneEVP, Chf Clinical Develop OfcrSale5.8k70.97$412,486
17 Mar 2026 ↗HOUGEN ELIZABETH LEVP, Finance & CFOSale10.2k73.21$744,662
16 Mar 2026 ↗HOUGEN ELIZABETH LEVP, Finance & CFOSale215k72.40$15.6m
10 Mar 2026 ↗Jenne KyleEVP, Chf GL Pdt Str OfcrSale37.3k75.85$2.8m
10 Mar 2026 ↗Monia Brett PChief Executive OfficerSale34.1k75.92$2.6m
9 Mar 2026 ↗O'NEIL PATRICK R.EVP CLO & General CounselSale10.1k75.25$763,662
9 Mar 2026 ↗Monia Brett PChief Executive OfficerSale126.7k75.20$9.5m
4 Mar 2026 ↗Baroldi JosephEVP, Chief Business OfficerSale43980.00$35,120
4 Mar 2026 ↗LOSCALZO JOSEPHDirectorSale20080.00$16,000
3 Mar 2026 ↗Baroldi JosephEVP, Chief Business OfficerSale4.1k79.37$327,975
3 Mar 2026 ↗KLEIN JOSEPH IIIDirectorSale6.8k80.00$543,486
3 Mar 2026 ↗Devers Shannon L.EVP, Chief Human Resources OfcSale20.1k79.40$1.6m
3 Mar 2026 ↗BENNETT C FRANKEVP, Chief Scientific OfficerSale85.1k79.23$6.7m

Short interest

Shares sold short, 15 Oct 2026. US exchange data.

20.7m

-8.2% on the period before. 7.7 days to cover.

Short volume

Share of the day's trading sold short, 4 Nov 2026

45.8%

Last 60 trading days.

Failed deliveries

Shares not delivered on settlement, from the SEC

  • 10 Sept 20265,975 shares
  • 9 Sept 20268,518 shares
  • 8 Sept 202620 shares
  • 4 Sept 202614 shares
  • 19 Aug 20263,049 shares

Sources and methodology

Data on this tab
Our data supplier
Chart on the Overview
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Nothing here is investment advice. Prices can be delayed or wrong, so check with the exchange before relying on them. Data for this page. How we cover markets.