ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

Position in IONS — Ionis Pharmaceuticals Inc

CIK 1164508 BOSTON, MA

Position in IONS

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$55,405,832

-$28,713,966 QoQ

Shares Held

737,859

-30.6% QoQ

Ownership

0.446%

of shares outstanding

% of Portfolio

0.03%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2020

7 quarters on record

Voting authority Sole 98.72265568353845.ToString("F0")% Shared 0.ToString("F0")% None 1.2773443164615463.ToString("F0")%

Healthcare · as of Mar 31, 2026

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP holds $1,776,833,332 across 48 Biotechnology names. IONS ranks #8 (3.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	VRTX	Vertex Pharmaceuticals Inc / Ma	638,950	$285,316,733
2	INCY	Incyte Corp	2,830,799	$266,434,801
3	EXEL	Exelixis, Inc.	4,834,625	$207,357,066
4	GMAB	Genmab A/S	4,975,324	$133,487,942
5	REGN	Regeneron Pharmaceuticals, Inc.	171,571	$132,562,617
6	HALO	Halozyme Therapeutics, Inc.	1,918,149	$123,969,969
7	RPRX	Royalty Pharma plc	2,010,398	$96,438,792
8	IONS	Ionis Pharmaceuticals Inc This page	737,859	$55,405,832

7 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$55,405,832	737,859	-30.6%	Shares	Defined	2026-05-14
2025-12-31	$84,119,798	1,063,327	+68.7%	Shares	Defined	2026-02-13
2025-09-30	$41,223,497	630,136	+1433.0%	Shares	Defined	2025-11-13
2022-06-30	$1,521,670	41,104	+0.0%	Shares	Defined	2022-08-15
2021-09-30	$1,378,494	41,100	-55.8%	Shares	Defined	2021-11-12
2021-06-30	$3,705,781	92,900	+257.3%	Shares	Defined	2021-08-13
2020-09-30	$1,233,700	26,000	—	Shares	Defined	2020-11-12
No filing history on record for this holder in this stock.