Artisan Partners
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Artisan Partners’s Ionis Pharmaceuticals IONS Stock Holding History

Artisan Partners’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 		$209M Buy
2,640,024
+581,716
+28% +$43.8M 0.33% 73
2026
Q1 		$155M Buy
2,058,308
+876,892
+74% +$69.2M 0.25% 94
2025
Q4 		$93.5M Buy
1,181,416
+291,344
+33% +$21.9M 0.14% 156
2025
Q3 		$58.2M Buy
890,072
+535,110
+151% +$26.1M 0.08% 197
2025
Q2 		$14M Buy
354,962
+151,784
+75% +$4.97M 0.02% 304
2025
Q1 		$6.13M Sell
203,178
-49,457
-20% -$1.62M 0.01% 317
2024
Q4 		$8.83M Sell
252,635
-1,987,820
-89% -$74.3M 0.01% 327
2024
Q3 		$89.8M Buy
2,240,455
+569,419
+34% +$26.5M 0.13% 159
2024
Q2 		$79.6M Buy
1,671,036
+1,254,307
+301% +$51.4M 0.12% 167
2024
Q1 		$18.1M Buy
+416,729
New +$19.9M 0.03% 276
2016
Q2 		– Sell
-138,097
Closed -$5.59M – 301
2016
Q1 		$5.59M Buy
138,097
+64,625
+88% +$2.62M 0.01% 292
2015
Q4 		$4.55M Sell
73,472
-1,577
-2% -$85.1K 0.01% 335
2015
Q3 		$3.03M Buy
75,049
+1,998
+3% +$103K 0.01% 354
2015
Q2 		$4.2M Sell
73,051
-136,191
-65% -$8.66M 0.01% 353
2015
Q1 		$13.3M Sell
209,242
-3,643,401
-95% -$247M 0.02% 282
2014
Q4 		$238M Sell
3,852,643
-3,515,856
-48% -$173M 0.41% 78
2014
Q3 		$286M Sell
7,368,499
-202,577
-3% -$7.18M 0.51% 61
2014
Q2 		$261M Sell
7,571,076
-1,190,693
-14% -$37.5M 0.45% 76
2014
Q1 		$379M Sell
8,761,769
-2,014,378
-19% -$97.6M 0.67% 43
2013
Q4 		$429M Buy
10,776,147
+142,410
+1% +$5.07M 0.77% 27
2013
Q3 		$399M Buy
10,633,737
+1,468,994
+16% +$43.9M 0.77% 30
2013
Q2 		$246M Buy
+9,164,743
New +$195M 0.53% 64

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

Artisan Partners's IONS Position: Q2 2026 in Review

Artisan Partners increased its Ionis Pharmaceuticals (IONS) stake by 28% in Q2 2026, buying an estimated $43.8M and bringing the position to 2,640,024 shares worth $209M. The position accounts for 0.33% of the portfolio, ranked #73.

Artisan Partners first reported a position in IONS in Q2 2013 and has held it in 22 quarters since. The position peaked at $429M in Q4 2013. 513 funds tracked by Wall St. Rank hold IONS as of Q2 2026.

  • Artisan Partners held 2,640,024 shares of Ionis Pharmaceuticals worth $209M as of Q2 2026.
  • Artisan Partners bought 581,716 Ionis Pharmaceuticals shares in Q2 2026, an estimated $43.8M.
  • Ionis Pharmaceuticals made up 0.33% of Artisan Partners's portfolio in Q2 2026, its #73 holding.
  • Artisan Partners first reported a position in Ionis Pharmaceuticals in Q2 2013 and has held it in 22 quarters since.
  • Artisan Partners's Ionis Pharmaceuticals position peaked at $429M in Q4 2013.
  • 513 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q2 2026.

Based on Artisan Partners's 13F filing for Q2 2026, filed 13 Aug 2026.