AMERICAN CENTURY COMPANIES INC

Position in IONS — Ionis Pharmaceuticals Inc

CIK 748054 KANSAS CITY, MO

Position in IONS

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$124,934,967

-$2,994,288 QoQ

Shares Held

1,663,803

+2.9% QoQ

Ownership

1.01%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

22 quarters on record

Voting authority Sole 82.20306129992552.ToString("F0")% Shared 17.79693870007447.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

AMERICAN CENTURY COMPANIES INC holds $3,844,311,104 across 169 Biotechnology names. IONS ranks #7 (3.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ALNY	Alnylam Pharmaceuticals, Inc.	1,802,363	$596,347,845
2	REGN	Regeneron Pharmaceuticals, Inc.	562,097	$434,298,626
3	VRTX	Vertex Pharmaceuticals Inc / Ma	813,285	$363,164,283
4	ASND	Ascendis Pharma A/S	1,397,119	$319,563,028
5	INSM	INSMED Inc	925,799	$151,386,652
6	ARGX	Argenx SE	173,700	$126,844,425
7	IONS	Ionis Pharmaceuticals Inc This page	1,663,803	$124,934,967
8	CPRX	Catalyst Pharmaceuticals, Inc.	4,138,416	$102,467,180

22 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$124,934,967	1,663,803	+2.9%	Shares	Defined	2026-05-15
2025-12-31	$127,929,255	1,617,106	+17.8%	Shares	Defined	2026-02-13
2025-09-30	$89,770,959	1,372,225	+190.3%	Shares	Defined	2025-11-12
2025-06-30	$18,678,312	472,749	+304.9%	Shares	Defined	2025-08-12
2025-03-31	$3,522,890	116,768	+1755.5%	Shares	Defined	2025-05-13
2024-09-30	$252,097	6,293	-53.2%	Shares	Defined	2024-11-12
2024-06-30	$640,598	13,441	+0.5%	Shares	Defined	2024-08-07
2024-03-31	$579,936	13,378	+1.2%	Shares	Defined	2024-05-14
2023-12-31	$668,597	13,216	+4.8%	Shares	Defined	2024-02-13
2023-06-30	$517,265	12,607	-4.2%	Shares	Defined	2023-08-14
2023-03-31	$470,445	13,163	-57.4%	Shares	Defined	2023-05-11
2022-12-31	$1,166,035	30,872	+206.3%	Shares	Defined	2023-02-13
2022-09-30	$445,794	10,079	+37.0%	Shares	Defined	2022-11-14
2022-06-30	$272,282	7,355	+31.5%	Shares	Defined	2022-08-12
2022-03-31	$207,201	5,594	-97.2%	Shares	Defined	2022-05-11
2021-09-30	$6,686,064	199,346	-11.9%	Shares	Defined	2021-11-10
2021-06-30	$9,022,320	226,180	-76.0%	Shares	Defined	2021-08-05
2021-03-31	$42,382,802	942,678	-24.3%	Shares	Defined	2021-05-14
2020-12-31	$70,365,726	1,244,530	-6.8%	Shares	Defined	2021-02-12
2020-09-30	$63,379,629	1,335,714	-7.7%	Shares	Defined	2020-11-13
2020-06-30	$85,367,122	1,447,882	+2.9%	Shares	Defined	2020-08-13
2020-03-31	$66,552,651	1,407,628	—	Shares	Defined	2020-05-14
No filing history on record for this holder in this stock.