Massachusetts Financial Services
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Massachusetts Financial Services’s Ionis Pharmaceuticals IONS Stock Holding History

Massachusetts Financial Services’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 		$50M Sell
666,116
-146,631
-18% -$11.6M 0.02% 477
2025
Q4 		$64.3M Sell
812,747
-49,846
-6% -$3.75M 0.02% 438
2025
Q3 		$56.4M Buy
862,593
+343,409
+66% +$16.8M 0.02% 448
2025
Q2 		$20.5M Buy
+519,184
New +$17M 0.01% 612
2024
Q2 		– Sell
-5,580
Closed -$242K – 878
2024
Q1 		$242K Sell
5,580
-12
-0.2% -$572 ﹤0.01% 829
2023
Q4 		$283K Sell
5,592
-177
-3% -$8.48K ﹤0.01% 822
2023
Q3 		$262K Sell
5,769
-20,760
-78% -$856K ﹤0.01% 828
2023
Q2 		$1.09M Sell
26,529
-624
-2% -$24K ﹤0.01% 748
2023
Q1 		$970K Buy
+27,153
New +$1.02M ﹤0.01% 763
2016
Q2 		– Sell
-335,242
Closed -$13.6M – 864
2016
Q1 		$13.6M Buy
335,242
+4,189
+1% +$170K 0.01% 539
2015
Q4 		$20.5M Sell
331,053
-43,450
-12% -$2.34M 0.01% 494
2015
Q3 		$15.1M Sell
374,503
-560,279
-60% -$29M 0.01% 541
2015
Q2 		$53.8M Sell
934,782
-39,869
-4% -$2.53M 0.03% 332
2015
Q1 		$62.1M Sell
974,651
-123,017
-11% -$8.35M 0.03% 309
2014
Q4 		$67.8M Buy
1,097,668
+62,738
+6% +$3.1M 0.03% 292
2014
Q3 		$40.2M Buy
1,034,930
+471,424
+84% +$16.7M 0.02% 387
2014
Q2 		$19.4M Buy
563,506
+101,356
+22% +$3.19M 0.01% 540
2014
Q1 		$20M Buy
+462,150
New +$22.4M 0.01% 500

Other funds holding IONS

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
BlackRock
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
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Massachusetts Financial Services's IONS Position: Q1 2026 in Review

Massachusetts Financial Services reduced its Ionis Pharmaceuticals (IONS) stake by 18% in Q1 2026, selling an estimated $11.6M and leaving 666,116 shares worth $50M. The position accounts for 0.02% of the portfolio, ranked #477.

Massachusetts Financial Services first reported a position in IONS in Q1 2014 and has held it in 18 quarters since. The position peaked at $67.8M in Q4 2014. 493 funds tracked by Wall St. Rank hold IONS as of Q1 2026.

  • Massachusetts Financial Services held 666,116 shares of Ionis Pharmaceuticals worth $50M as of Q1 2026.
  • Massachusetts Financial Services sold 146,631 Ionis Pharmaceuticals shares in Q1 2026, an estimated $11.6M.
  • Ionis Pharmaceuticals made up 0.02% of Massachusetts Financial Services's portfolio in Q1 2026, its #477 holding.
  • Massachusetts Financial Services first reported a position in Ionis Pharmaceuticals in Q1 2014 and has held it in 18 quarters since.
  • Massachusetts Financial Services's Ionis Pharmaceuticals position peaked at $67.8M in Q4 2014.
  • 493 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q1 2026.

Based on Massachusetts Financial Services's 13F filing for Q1 2026, filed 14 May 2026.