Marshall Wace
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Marshall Wace’s Ionis Pharmaceuticals IONS Stock Holding History

Marshall Wace’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 		$674K Sell
8,501
-87,453
-91% -$6.58M ﹤0.01% 2388
2026
Q1 		$7.21M Sell
95,954
-160,979
-63% -$12.7M 0.01% 1126
2025
Q4 		$20.3M Sell
256,933
-701,896
-73% -$52.9M 0.02% 622
2025
Q3 		$62.7M Buy
958,829
+945,729
+7,219% +$46.2M 0.06% 265
2025
Q2 		$518K Buy
13,100
+3,998
+44% +$131K ﹤0.01% 2133
2025
Q1 		$275K Sell
9,102
-803,204
-99% -$26.3M ﹤0.01% 2301
2024
Q4 		$28.4M Sell
812,306
-1,108,158
-58% -$41.4M 0.03% 439
2024
Q3 		$76.9M Buy
1,920,464
+1,747,265
+1,009% +$81.3M 0.09% 193
2024
Q2 		$8.25M Buy
173,199
+157,756
+1,022% +$6.47M 0.01% 819
2024
Q1 		$669K Sell
15,443
-118,106
-88% -$5.63M ﹤0.01% 1817
2023
Q4 		$6.76M Buy
133,549
+65,422
+96% +$3.13M 0.01% 805
2023
Q3 		$3.09M Sell
68,127
-936
-1% -$38.6K 0.01% 1040
2023
Q2 		$2.83M Buy
+69,063
New +$2.65M 0.01% 1250
2021
Q3 		– Sell
-176,820
Closed -$7.05M – 3215
2021
Q2 		$7.05M Buy
+176,820
New +$6.93M 0.03% 650
2021
Q1 		– Sell
-111,269
Closed -$6.29M – 2659
2020
Q4 		$6.29M Buy
111,269
+54,407
+96% +$2.71M 0.03% 491
2020
Q3 		$2.7M Buy
+56,862
New +$3.16M 0.02% 720
2020
Q1 		– Sell
-1,016
Closed -$61K – 1845
2019
Q4 		$61K Buy
1,016
+455
+81% +$27.1K ﹤0.01% 1522
2019
Q3 		$34K Buy
+561
New +$36.6K ﹤0.01% 1544
2019
Q2 		– Sell
-45
Closed -$4K – 1571
2019
Q1 		$4K Buy
+45
New +$2.9K ﹤0.01% 1652
2018
Q4 		– Sell
-8,939
Closed -$461K – 1688
2018
Q3 		$461K Buy
+8,939
New +$420K ﹤0.01% 945
2016
Q1 		– Sell
-128,328
Closed -$7.95M – 1101
2015
Q4 		$7.95M Sell
128,328
-2,842
-2% -$153K 0.07% 272
2015
Q3 		$5.3M Sell
131,170
-18,115
-12% -$938K 0.07% 283
2015
Q2 		$8.59M Buy
+149,285
New +$9.49M 0.11% 201

Other funds holding IONS

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
Royal Bank of Canada
Royal Bank of Canada Toronto, Ontario, Canada $672B AUM 33.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

Marshall Wace's IONS Position: Q2 2026 in Review

Marshall Wace reduced its Ionis Pharmaceuticals (IONS) stake by 91% in Q2 2026, selling an estimated $6.58M and leaving 8,501 shares worth $674K. The position accounts for ﹤0.01% of the portfolio, ranked #2388.

Marshall Wace first reported a position in IONS in Q2 2015 and has held it in 23 quarters since. The position peaked at $76.9M in Q3 2024. 514 funds tracked by Wall St. Rank hold IONS as of Q2 2026.

  • Marshall Wace held 8,501 shares of Ionis Pharmaceuticals worth $674K as of Q2 2026.
  • Marshall Wace sold 87,453 Ionis Pharmaceuticals shares in Q2 2026, an estimated $6.58M.
  • Ionis Pharmaceuticals made up ﹤0.01% of Marshall Wace's portfolio in Q2 2026, its #2388 holding.
  • Marshall Wace first reported a position in Ionis Pharmaceuticals in Q2 2015 and has held it in 23 quarters since.
  • Marshall Wace's Ionis Pharmaceuticals position peaked at $76.9M in Q3 2024.
  • 514 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.