Ionis Pharmaceuticals, Inc.

IONSNASDAQHealthcare● Active

$74.34

$-0.14(-0.19%)

Market Cap$12.3B

P/E Ratio—

52W High$86.74

52W Low$34.78

Avg Volume1.9M

Open$74.34

Beta0.37

Overview

Ionis Pharmaceuticals, Inc. (IONS) Number of Employees – History & Annual Headcount

Annual SEC headcount, year-over-year change, and per-employee efficiency — chart and full history below.

SEC EDGAR · FMP · IONS · as of Feb 26, 2026

Latest filing snapshot

1,402

+333+31.15%vs prior year

Ionis Pharmaceuticals, Inc. (IONS) employee data is sourced from the annual SEC 10-K filing. As of 2025, full-time employees only. Global consolidated headcount. View SEC filing ↗

SEC 10-K·Period end: 2025-12-31·Full-time · Global

Total Employees

1,402

Change (1Y)

+333

Growth % (1Y)

+31.15%

Revenue / Employee

$673.3K

Net Income / Employee

$-271.8K

Market Cap

$12.2B

IONS Employee Count

1996 – 2025 · Annual · SEC filing

Source: SEC annual filings · Hover bar to view year data · Click to view original filing

Employees History

Filing Date	Period End	Employees	Change (1Y)	Growth (1Y)
2026-02-26	2025-12-31	1,402	+333	+31.15%
2025-02-19	2024-12-31	1,069	+142	+15.32%
2024-02-21	2023-12-31	927	+131	+16.46%
2023-02-22	2022-12-31	796	+136	+20.61%
2022-02-25	2021-12-31	660	-97	-12.81%
2021-02-24	2020-12-31	757	-60	-7.34%
2020-03-02	2019-12-31	817	+80	+10.85%
2019-03-01	2018-12-31	737	+190	+34.73%
2018-02-28	2017-12-31	547	+112	+25.75%
2017-03-01	2016-12-31	435	+7	+1.64%

▸ Source: SEC Annual Reports (Form 10-K / 20-F). Employee counts as of fiscal year end. Click the ↗ icon at the end of a row to open the original SEC filing in a new tab.

Related Companies — Employee Count

Biotechnology

#SymbolCompanyEmployeesMkt Cap

BMRN

BioMarin Pharmaceutical Inc.

3,040$10.9B #2

Guardant Health, Inc.

1,999$17.0B #3

IONS

Ionis Pharmaceuticals, Inc.YOU

BridgeBio Pharma, Inc.

725$13.3B #7

MDGL

Madrigal Pharmaceuticals, Inc.

528$11.0B

Source: /stock-peers + /profile.fullTimeEmployees · Click row → /employees · Sorted by headcount · IONS peer comparison

About IONS employees

IONS Employees · Headcount

Ionis Pharmaceuticals, Inc. (IONS) employee data is sourced from the annual SEC 10-K filing. As of 2025, Ionis Pharmaceuticals, Inc. had 1,402 full-time employees globally. Full-time employees only. Global consolidated headcount.

Ionis Pharmaceuticals, Inc. employs 1,402 full-time employees as of the latest filing within the Biotechnology industry. Revenue per employee stands at $673,324, reflecting the company's operational efficiency.

Ionis Pharmaceuticals, Inc.'s workforce increased by 333 (31.15%) in 2025 compared to the prior fiscal year. The historical trend reflects the company's expansion and contraction cycles.

Ionis Pharmaceuticals, Inc.'s revenue per employee of $673,324 positions it among the notable performers in the Biotechnology sector for operational efficiency.

Revenue Financial statements Net income SEC filings Price history Forecast & ratings Ownership Earnings

Frequently Asked Questions

IONS Employees · 5 questions

As of the latest SEC 10-K filing (2025), Ionis Pharmaceuticals, Inc. had 1,402 full-time employees globally. This figure is sourced from the company's mandatory annual disclosure to the SEC.

Ionis Pharmaceuticals, Inc. employee counthow many employees does Ionis Pharmaceuticals, Inc. haveIONS total employees 2025

▸ Data source: FMP /historical-employee-count · SEC EDGAR annual filings · As reported · Global consolidated headcount · As of 2026-02-26