American Century Companies’s Ionis Pharmaceuticals IONS Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q1 | $125M | Buy |
1,663,803
+46,697
| +3% | +$3.69M | 0.06% | 337 |
|
|
2025
Q4 | $128M | Buy |
1,617,106
+244,881
| +18% | +$18.4M | 0.06% | 325 |
|
|
2025
Q3 | $89.8M | Buy |
1,372,225
+899,476
| +190% | +$43.9M | 0.05% | 454 |
|
|
2025
Q2 | $18.7M | Buy |
472,749
+355,981
| +305% | +$11.6M | 0.01% | 1126 |
|
|
2025
Q1 | $3.52M | Buy |
+116,768
| New | +$3.82M | ﹤0.01% | 1748 |
|
|
2024
Q4 | – | Sell |
-6,293
| Closed | -$252K | – | 2918 |
|
|
2024
Q3 | $252K | Sell |
6,293
-7,148
| -53% | -$333K | ﹤0.01% | 2703 |
|
|
2024
Q2 | $641K | Buy |
13,441
+63
| +0.5% | +$2.58K | ﹤0.01% | 2350 |
|
|
2024
Q1 | $580K | Buy |
13,378
+162
| +1% | +$7.72K | ﹤0.01% | 2383 |
|
|
2023
Q4 | $669K | Buy |
13,216
+234
| +2% | +$11.2K | ﹤0.01% | 2250 |
|
|
2023
Q3 | $589K | Buy |
12,982
+375
| +3% | +$15.5K | ﹤0.01% | 2206 |
|
|
2023
Q2 | $517K | Sell |
12,607
-556
| -4% | -$21.4K | ﹤0.01% | 2204 |
|
|
2023
Q1 | $470K | Sell |
13,163
-17,709
| -57% | -$665K | ﹤0.01% | 2149 |
|
|
2022
Q4 | $1.17M | Buy |
30,872
+20,793
| +206% | +$875K | ﹤0.01% | 1742 |
|
|
2022
Q3 | $446K | Buy |
10,079
+2,724
| +37% | +$115K | ﹤0.01% | 1995 |
|
|
2022
Q2 | $272K | Buy |
7,355
+1,761
| +31% | +$66.4K | ﹤0.01% | 2076 |
|
|
2022
Q1 | $207K | Buy |
+5,594
| New | +$183K | ﹤0.01% | 2170 |
|
|
2021
Q4 | – | Sell |
-199,346
| Closed | -$6.69M | – | 2345 |
|
|
2021
Q3 | $6.69M | Sell |
199,346
-26,834
| -12% | -$1.01M | ﹤0.01% | 953 |
|
|
2021
Q2 | $9.02M | Sell |
226,180
-716,498
| -76% | -$28.1M | 0.01% | 847 |
|
|
2021
Q1 | $42.4M | Sell |
942,678
-301,852
| -24% | -$16.8M | 0.03% | 475 |
|
|
2020
Q4 | $70.4M | Sell |
1,244,530
-91,184
| -7% | -$4.54M | 0.05% | 326 |
|
|
2020
Q3 | $63.4M | Sell |
1,335,714
-112,168
| -8% | -$6.23M | 0.06% | 314 |
|
|
2020
Q2 | $85.4M | Buy |
1,447,882
+40,254
| +3% | +$2.24M | 0.08% | 258 |
|
|
2020
Q1 | $66.6M | Sell |
1,407,628
-8,657
| -0.6% | -$483K | 0.08% | 260 |
|
|
2019
Q4 | $85.6M | Buy |
1,416,285
+44,471
| +3% | +$2.65M | 0.08% | 264 |
|
|
2019
Q3 | $82.2M | Buy |
1,371,814
+2,338
| +0.2% | +$152K | 0.08% | 268 |
|
|
2019
Q2 | $88M | Buy |
1,369,476
+69,096
| +5% | +$4.88M | 0.09% | 270 |
|
|
2019
Q1 | $106M | Sell |
1,300,380
-304,594
| -19% | -$19.6M | 0.11% | 247 |
|
|
2018
Q4 | $86.8M | Buy |
1,604,974
+414,255
| +35% | +$21.1M | 0.1% | 254 |
|
|
2018
Q3 | $61.4M | Buy |
1,190,719
+5,537
| +0.5% | +$260K | 0.06% | 325 |
|
|
2018
Q2 | $49.4M | Buy |
1,185,182
+6,266
| +0.5% | +$278K | 0.05% | 358 |
|
|
2018
Q1 | $52M | Sell |
1,178,916
-2,193
| -0.2% | -$111K | 0.05% | 351 |
|
|
2017
Q4 | $59.4M | Buy |
1,181,109
+36,583
| +3% | +$2.01M | 0.06% | 347 |
|
|
2017
Q3 | $58M | Buy |
1,144,526
+284,266
| +33% | +$14.9M | 0.06% | 351 |
|
|
2017
Q2 | $43.8M | Sell |
860,260
-1,697
| -0.2% | -$79K | 0.05% | 391 |
|
|
2017
Q1 | $34.7M | Buy |
861,957
+145,850
| +20% | +$6.55M | 0.04% | 429 |
|
|
2016
Q4 | $34.3M | Buy |
716,107
+80,912
| +13% | +$3.2M | 0.04% | 439 |
|
|
2016
Q3 | $23.3M | Sell |
635,195
-1,610
| -0.3% | -$50.4K | 0.03% | 503 |
|
|
2016
Q2 | $14.8M | Buy |
636,805
+76,987
| +14% | +$2.48M | 0.02% | 584 |
|
|
2016
Q1 | $22.7M | Buy |
559,818
+49,565
| +10% | +$2.01M | 0.03% | 488 |
|
|
2015
Q4 | $31.6M | Buy |
510,253
+2,838
| +0.6% | +$153K | 0.04% | 443 |
|
|
2015
Q3 | $20.5M | Buy |
507,415
+29,108
| +6% | +$1.51M | 0.03% | 507 |
|
|
2015
Q2 | $27.5M | Sell |
478,307
-16,076
| -3% | -$1.02M | 0.03% | 492 |
|
|
2015
Q1 | $31.5M | Sell |
494,383
-6,083
| -1% | -$413K | 0.04% | 460 |
|
|
2014
Q4 | $30.9M | Buy |
500,466
+36,629
| +8% | +$1.81M | 0.03% | 465 |
|
|
2014
Q3 | $18M | Sell |
463,837
-69,779
| -13% | -$2.47M | 0.02% | 547 |
|
|
2014
Q2 | $18.4M | Sell |
533,616
-586,775
| -52% | -$18.5M | 0.02% | 556 |
|
|
2014
Q1 | $48.4M | Buy |
1,120,391
+993,171
| +781% | +$48.1M | 0.06% | 372 |
|
|
2013
Q4 | $5.07M | Buy |
127,220
+47,428
| +59% | +$1.69M | 0.01% | 896 |
|
|
2013
Q3 | $3M | Sell |
79,792
-14,188
| -15% | -$424K | ﹤0.01% | 1020 |
|
|
2013
Q2 | $2.52M | Buy |
+93,980
| New | +$2M | ﹤0.01% | 1032 |
|
Other funds holding IONS
VPM
VCM
American Century Companies's IONS Position: Q1 2026 in Review
American Century Companies increased its Ionis Pharmaceuticals (IONS) stake by 2.9% in Q1 2026, buying an estimated $3.69M and bringing the position to 1,663,803 shares worth $125M. The position accounts for 0.06% of the portfolio, ranked #337.
American Century Companies first reported a position in IONS in Q2 2013 and has held it in 50 quarters since. The position peaked at $128M in Q4 2025. 493 funds tracked by Wall St. Rank hold IONS as of Q1 2026.
- American Century Companies held 1,663,803 shares of Ionis Pharmaceuticals worth $125M as of Q1 2026.
- American Century Companies bought 46,697 Ionis Pharmaceuticals shares in Q1 2026, an estimated $3.69M.
- Ionis Pharmaceuticals made up 0.06% of American Century Companies's portfolio in Q1 2026, its #337 holding.
- American Century Companies first reported a position in Ionis Pharmaceuticals in Q2 2013 and has held it in 50 quarters since.
- American Century Companies's Ionis Pharmaceuticals position peaked at $128M in Q4 2025.
- 493 funds tracked by Wall St. Rank held Ionis Pharmaceuticals as of Q1 2026.
Based on American Century Companies's 13F filing for Q1 2026, filed 15 May 2026.