Robeco Institutional Asset Management’s Ionis Pharmaceuticals IONS Stock Holding History

Robeco Institutional Asset Management’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 Q1	$425K	Buy	+5,660	New	+$447K	﹤0.01%	799
2021 Q2	–	Sell	-5,038	Closed	-$227K	–	967
2021 Q1	$227K	Hold	5,038	–	–	﹤0.01%	863
2020 Q4	$285K	Hold	5,038	–	–	﹤0.01%	834
2020 Q3	$239K	Hold	5,038	–	–	﹤0.01%	827
2020 Q2	$297K	Hold	5,038	–	–	﹤0.01%	853
2020 Q1	$238K	Sell	5,038 -6,461	-56%	-$360K	﹤0.01%	875
2019 Q4	$693K	Sell	11,499 -960	-8%	-$57.2K	﹤0.01%	819
2019 Q3	$747K	Buy	12,459 +2,946	+31%	+$192K	﹤0.01%	805
2019 Q2	$612K	Buy	+9,513	New	+$672K	﹤0.01%	824
2014 Q2	–	Sell	-828	Closed	-$36K	–	762
2014 Q1	$36K	Hold	828	–	–	﹤0.01%	705
2013 Q4	$33K	Sell	828 -332	-29%	-$11.8K	﹤0.01%	650
2013 Q3	$44K	Hold	1,160	–	–	﹤0.01%	641
2013 Q2	$31K	Buy	+1,160	New	+$24.7K	﹤0.01%	629

Other funds holding IONS

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Robeco Institutional Asset Management's IONS Position: Q1 2026 in Review

Robeco Institutional Asset Management opened a new position in Ionis Pharmaceuticals (IONS) in Q1 2026: 5,660 shares worth $425K. The stake represents ﹤0.01% of the portfolio and ranks #799 among its holdings. This is a return to the name: Robeco Institutional Asset Management previously reported a position in IONS as recently as Q1 2021.

Robeco Institutional Asset Management first reported a position in IONS in Q2 2013 and has held it in 13 quarters since. The position peaked at $747K in Q3 2019. 493 funds tracked by Wall St. Rank hold IONS as of Q1 2026.

Robeco Institutional Asset Management held 5,660 shares of Ionis Pharmaceuticals worth $425K as of Q1 2026.
Ionis Pharmaceuticals was a new Robeco Institutional Asset Management position in Q1 2026.
Ionis Pharmaceuticals made up ﹤0.01% of Robeco Institutional Asset Management's portfolio in Q1 2026, its #799 holding.
Robeco Institutional Asset Management first reported a position in Ionis Pharmaceuticals in Q2 2013 and has held it in 13 quarters since.
Robeco Institutional Asset Management's Ionis Pharmaceuticals position peaked at $747K in Q3 2019.
493 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q1 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q1 2026, filed 21 Apr 2026.