GW&K Investment Management’s Ionis Pharmaceuticals IONS Stock Holding History

GW&K Investment 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	$58.5M	Sell	779,349 -7,319	-0.9%	-$578K	0.52%	57
2025 Q4	$62.2M	Buy	786,668 +522,661	+198%	+$39.4M	0.54%	50
2025 Q3	$17.3M	Sell	264,007 -184,823	-41%	-$9.02M	0.15%	217
2025 Q2	$17.7M	Buy	448,830 +266,521	+146%	+$8.72M	0.16%	213
2025 Q1	$5.5M	Sell	182,309 -4,911	-3%	-$161K	0.05%	272
2024 Q4	$6.54M	Buy	+187,220	New	+$7M	0.06%	275

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

GW&K Investment Management's IONS Position: Q1 2026 in Review

GW&K Investment Management reduced its Ionis Pharmaceuticals (IONS) stake by 0.93% in Q1 2026, selling an estimated $578K and leaving 779,349 shares worth $58.5M. The position accounts for 0.52% of the portfolio, ranked #57.

GW&K Investment Management first reported a position in IONS in Q4 2024 and has held it in 6 quarters since. The position peaked at $62.2M in Q4 2025. 493 funds tracked by Wall St. Rank hold IONS as of Q1 2026.

GW&K Investment Management held 779,349 shares of Ionis Pharmaceuticals worth $58.5M as of Q1 2026.
GW&K Investment Management sold 7,319 Ionis Pharmaceuticals shares in Q1 2026, an estimated $578K.
Ionis Pharmaceuticals made up 0.52% of GW&K Investment Management's portfolio in Q1 2026, its #57 holding.
GW&K Investment Management first reported a position in Ionis Pharmaceuticals in Q4 2024 and has held it in 6 quarters since.
GW&K Investment Management's Ionis Pharmaceuticals position peaked at $62.2M in Q4 2025.
493 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q1 2026.

Based on GW&K Investment Management's 13F filing for Q1 2026, filed 13 May 2026.