$IONS

$43.96 +$0.54 (1.24%) Close

$IONS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 166.2M shares outstanding

Who owns IONS?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 60.4%

FMR LLC 14.8% · Capital World Investors 13.0%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

513

+15 vs last qtr

Net shares bought

+7.1M

by institutions in Q2 2026

New / sold out

67 / 52

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Royal Bank Of Canada +2.4M
Barclays PLC +1.3M

Biggest sellers in Q2 2026

T. Rowe Price Investment Management, Inc. −2.2M
Bellevue Group AG −846.4K

Who is planning to sell?

Notices of proposed sale, last 12 months

$134M

57 notices from 19 people

Shares covered

1.7M

1.02% of the company

Arranged in advance

84%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Monia Brett P Officer $41.2M
Hougen Elizabeth L Officer $17.8M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+32.3%

+3.16% a year

Each share's claim on the business

−24.4%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$125M vs $1.26B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years57% 3–5 years22% 1–3 years11% Under 1 year10%

Quarterly turnover

8.9%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting IONS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	24.6M	14.82%	+75.3K (+0.3%)	≤2021	0.1%
Shares held by quarter Peak holding24.6M (Q2'26) Change over 8 quarters+2.2M Share of the company14.820% FMR LLC's full portfolio →
CW Capital World Investors	21.7M	13.04%	+482.9K (+2.3%)	2023	0.2%
Shares held by quarter Peak holding21.7M (Q2'26) Change over 8 quarters+13.8M Share of the company13.040% Capital World Investors's full portfolio →

FMR LLC

24.6M

% of company

14.82%

Change vs last qtr

+75.3K (+0.3%)

Held since

≤2021

Capital World Investors

21.7M

% of company

13.04%

Change vs last qtr

+482.9K (+2.3%)

Held since

2023

28 more super investors behind a free account

See every manager holding Ionis Pharmaceuticals, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting IONS on Form N-PORT; together they hold 50.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
GF Growth Fund of America Growth Fund of America	$587M	7.7M	4.61%	0.16%	May 31, 2026
FG Fidelity Growth Company Fund Fidelity Mt. Vernon Street Trust	$513M	8.5M	5.12%	0.53%	August 31, 2026

Growth Fund of America

Position value

$587M

% of company

4.61%

% of the fund

0.16%

As of

May 31, 2026

Fidelity Growth Company Fund

Fidelity Mt. Vernon Street Trust

Position value

$513M

% of company

5.12%

% of the fund

0.53%

As of

August 31, 2026

23 more funds behind a free account

See every fund holding Ionis Pharmaceuticals, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
WJ Wender Joseph H Insider	314.4K	0.19%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.190% Wender Joseph H's insider activity →
MB Monia Brett P Insider	242.8K	0.15%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.150% Monia Brett P's insider activity →

Wender Joseph H

Insider

314.4K

% of company

0.19%

Change vs last qtr

—

Held since

—

Monia Brett P

Insider

242.8K

% of company

0.15%

Change vs last qtr

—

Held since

—

19 more holders behind a free account

See every insider and 5%+ holder of Ionis Pharmaceuticals, Inc..

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