Capital World Investors’s Ionis Pharmaceuticals IONS Stock Holding History

Capital World Investors’s Portfolio IONS Stock Details IONS Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$1.72B	Buy	21,669,226 +482,857	+2%	+$36.3M	0.2%	105
2026 Q1	$1.59B	Buy	21,186,369 +3,225,070	+18%	+$255M	0.22%	107
2025 Q4	$1.42B	Buy	17,961,299 +5,238,571	+41%	+$394M	0.19%	118
2025 Q3	$832M	Buy	12,722,728 +182,540	+1%	+$8.91M	0.11%	159
2025 Q2	$495M	Buy	12,540,188 +178,194	+1%	+$5.83M	0.07%	197
2025 Q1	$373M	Buy	12,361,994 +896,581	+8%	+$29.4M	0.06%	225
2024 Q4	$401M	Buy	11,465,413 +3,637,041	+46%	+$136M	0.06%	209
2024 Q3	$314M	Buy	7,828,372 +5,576,283	+248%	+$259M	0.05%	241
2024 Q2	$107M	Buy	2,252,089 +1,412,626	+168%	+$57.9M	0.02%	324
2024 Q1	$36.4M	Hold	839,463	–	–	0.01%	418
2023 Q4	$42.5M	Hold	839,463	–	–	0.01%	398
2023 Q3	$38.1M	Hold	839,463	–	–	0.01%	400
2023 Q2	$34.4M	Buy	+839,463	New	+$32.3M	0.01%	398

Other funds holding IONS

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

Royal Bank of Canada Toronto, Ontario, Canada $672B AUM 33.48% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Capital World Investors's IONS Position: Q2 2026 in Review

Capital World Investors increased its Ionis Pharmaceuticals (IONS) stake by 2.3% in Q2 2026, buying an estimated $36.3M and bringing the position to 21,669,226 shares worth $1.72B. The position accounts for 0.2% of the portfolio, ranked #105.

Capital World Investors first reported a position in IONS in Q2 2023 and has held it in 13 quarters since. 513 funds tracked by Wall St. Rank hold IONS as of Q2 2026.

Capital World Investors held 21,669,226 shares of Ionis Pharmaceuticals worth $1.72B as of Q2 2026.
Capital World Investors bought 482,857 Ionis Pharmaceuticals shares in Q2 2026, an estimated $36.3M.
Ionis Pharmaceuticals made up 0.2% of Capital World Investors's portfolio in Q2 2026, its #105 holding.
Capital World Investors first reported a position in Ionis Pharmaceuticals in Q2 2023 and has held it in 13 quarters since.
513 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q2 2026.

Based on Capital World Investors's 13F filing for Q2 2026, filed 12 Aug 2026.