Capital World Investors

Holdings History for IONIS PHARMACEUTICALS INC - COMMON STOCK (IONS)

Symbol: IONS on Nasdaq
Investment type: Equity / COMMON STOCK
Latest Disclosed Shares Owned: 17,961,299 shares
Security Ownership %: 11%

Shares, Excluding Options vs Price

Value, Excluding Options

Capital World Investors ownership in IONIS PHARMACEUTICALS INC COMMON STOCK (IONS)

07 Jan 2026 - Capital World Investors has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 17,961,299 shares of IONIS PHARMACEUTICALS INC COMMON STOCK (IONS). This represents 11% ownership of the company. In their previous filing dated 13 Feb 2025, Capital World Investors had reported owning 11,465,413 shares, indicating an increase of +57%. .

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filing time
Capital World Investors	11%	+54%	$1,420,920,160	17,961,299	+6,495,886	+57%	$79.11	13G/A	31 Dec 2025	07 Jan 2026, 19:48
Capital World Investors	7.3%		$340,981,383	11,465,413			$29.74	13G	31 Dec 2024	13 Feb 2025, 16:53

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	0.19%	+0.06%	$1,420,918,364	17,961,299	+5,238,571	+41%	$79.11	Q4 2025
30 Sep 2025	0.11%	+0%	$832,320,866	12,722,728	+182,540	+1.5%	$65.42	Q3 2025
30 Jun 2025	0.07%	+0%	$495,462,828	12,540,188	+178,194	+1.4%	$39.51	Q2 2025
31 Mar 2025	0.06%	+0%	$372,961,359	12,361,994	+896,581		$30.17	Q1 2025
31 Dec 2024	0.06%	+0.02%	$400,830,838	11,465,413	+3,637,041	+46%	$34.96	Q4 2024
30 Sep 2024	0.05%	+0.03%	$313,604,582	7,828,372	+5,576,283	+248%	$40.06	Q3 2024
30 Jun 2024	0.02%	+0.01%	$107,334,562	2,252,089	+1,412,626	+168%	$47.66	Q2 2024
31 Mar 2024	0.01%	0%	$36,390,721	839,463	0		$43.35	Q1 2024
31 Dec 2023	0.01%	0%	$42,468,433	839,463	0		$50.59	Q4 2023
30 Sep 2023	0.01%	0%	$38,078,042	839,463	0		$45.36	Q3 2023
30 Jun 2023	0.01%	+0.01%	$34,443,167	839,463	+839,463	NEW	$41.03	Q2 2023

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.