American Century Companies’s Alnylam Pharmaceuticals ALNY Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q2 | $558M | Buy |
1,853,956
+51,593
| +3% | +$15.6M | 0.25% | 43 |
|
|
2026
Q1 | $596M | Buy |
1,802,363
+317,202
| +21% | +$108M | 0.31% | 30 |
|
|
2025
Q4 | $591M | Sell |
1,485,161
-156,280
| -10% | -$69.2M | 0.3% | 30 |
|
|
2025
Q3 | $748M | Sell |
1,641,441
-152,405
| -8% | -$62.1M | 0.38% | 21 |
|
|
2025
Q2 | $585M | Buy |
1,793,846
+33,411
| +2% | +$9.25M | 0.32% | 31 |
|
|
2025
Q1 | $475M | Buy |
1,760,435
+156,411
| +10% | +$40.2M | 0.29% | 39 |
|
|
2024
Q4 | $377M | Buy |
1,604,024
+11,291
| +0.7% | +$2.97M | 0.22% | 62 |
|
|
2024
Q3 | $438M | Buy |
1,592,733
+238,564
| +18% | +$62.1M | 0.25% | 52 |
|
|
2024
Q2 | $329M | Sell |
1,354,169
-19,485
| -1% | -$3.08M | 0.2% | 74 |
|
|
2024
Q1 | $205M | Buy |
1,373,654
+958,710
| +231% | +$160M | 0.13% | 159 |
|
|
2023
Q4 | $79.4M | Sell |
414,944
-27,799
| -6% | -$4.74M | 0.05% | 362 |
|
|
2023
Q3 | $78.4M | Buy |
442,743
+3,872
| +0.9% | +$739K | 0.06% | 333 |
|
|
2023
Q2 | $83.4M | Sell |
438,871
-5,737
| -1% | -$1.14M | 0.06% | 317 |
|
|
2023
Q1 | $85.1M | Sell |
444,608
-255,187
| -36% | -$53.6M | 0.07% | 306 |
|
|
2022
Q4 | $166M | Buy |
699,795
+6,788
| +1% | +$1.45M | 0.14% | 183 |
|
|
2022
Q3 | $139M | Buy |
693,007
+118,066
| +21% | +$22.5M | 0.12% | 183 |
|
|
2022
Q2 | $83.9M | Sell |
574,941
-556,903
| -49% | -$79M | 0.07% | 301 |
|
|
2022
Q1 | $185M | Buy |
1,131,844
+129,270
| +13% | +$19.7M | 0.13% | 185 |
|
|
2021
Q4 | $170M | Sell |
1,002,574
-68,897
| -6% | -$12.8M | 0.11% | 203 |
|
|
2021
Q3 | $202M | Buy |
1,071,471
+25,281
| +2% | +$4.74M | 0.14% | 164 |
|
|
2021
Q2 | $177M | Sell |
1,046,190
-48,331
| -4% | -$7.08M | 0.12% | 184 |
|
|
2021
Q1 | $155M | Buy |
1,094,521
+15,171
| +1% | +$2.28M | 0.11% | 211 |
|
|
2020
Q4 | $140M | Buy |
1,079,350
+90,038
| +9% | +$12M | 0.11% | 216 |
|
|
2020
Q3 | $144M | Sell |
989,312
-7,874
| -0.8% | -$1.12M | 0.13% | 198 |
|
|
2020
Q2 | $148M | Buy |
997,186
+590,558
| +145% | +$79.6M | 0.14% | 183 |
|
|
2020
Q1 | $44.3M | Buy |
406,628
+131,148
| +48% | +$15.1M | 0.05% | 323 |
|
|
2019
Q4 | $31.7M | Sell |
275,480
-18,087
| -6% | -$1.8M | 0.03% | 426 |
|
|
2019
Q3 | $23.6M | Sell |
293,567
-39,120
| -12% | -$3.09M | 0.02% | 456 |
|
|
2019
Q2 | $24.1M | Sell |
332,687
-378,163
| -53% | -$29M | 0.02% | 476 |
|
|
2019
Q1 | $66.4M | Buy |
710,850
+17,687
| +3% | +$1.48M | 0.07% | 312 |
|
|
2018
Q4 | $50.5M | Buy |
693,163
+77,943
| +13% | +$6M | 0.06% | 337 |
|
|
2018
Q3 | $53.8M | Buy |
615,220
+187,480
| +44% | +$18.9M | 0.05% | 340 |
|
|
2018
Q2 | $42.1M | Buy |
+427,740
| New | +$42.4M | 0.04% | 381 |
|
|
2017
Q4 | – | Sell |
-6,217
| Closed | -$730K | – | 1266 |
|
|
2017
Q3 | $730K | Sell |
6,217
-3,486
| -36% | -$298K | ﹤0.01% | 1183 |
|
|
2017
Q2 | $774K | Hold |
9,703
| – | – | ﹤0.01% | 1164 |
|
|
2017
Q1 | $497K | Hold |
9,703
| – | – | ﹤0.01% | 1235 |
|
|
2016
Q4 | $363K | Sell |
9,703
-470
| -5% | -$19.7K | ﹤0.01% | 1268 |
|
|
2016
Q3 | $690K | Sell |
10,173
-220
| -2% | -$15.5K | ﹤0.01% | 1228 |
|
|
2016
Q2 | $577K | Buy |
+10,393
| New | +$655K | ﹤0.01% | 1229 |
|
|
2015
Q3 | – | Sell |
-321,523
| Closed | -$38.5M | – | 1334 |
|
|
2015
Q2 | $38.5M | Buy |
321,523
+65,188
| +25% | +$7.79M | 0.04% | 434 |
|
|
2015
Q1 | $26.8M | Buy |
256,335
+248,598
| +3,213% | +$25.2M | 0.03% | 485 |
|
|
2014
Q4 | $750K | Buy |
7,737
+234
| +3% | +$21.7K | ﹤0.01% | 1231 |
|
|
2014
Q3 | $586K | Hold |
7,503
| – | – | ﹤0.01% | 1262 |
|
|
2014
Q2 | $474K | Sell |
7,503
-42,662
| -85% | -$2.54M | ﹤0.01% | 1329 |
|
|
2014
Q1 | $3.37M | Sell |
50,165
-564
| -1% | -$43.7K | ﹤0.01% | 1019 |
|
|
2013
Q4 | $3.26M | Sell |
50,729
-50
| -0.1% | -$2.98K | ﹤0.01% | 1016 |
|
|
2013
Q3 | $3.25M | Buy |
50,779
+2,540
| +5% | +$127K | ﹤0.01% | 997 |
|
|
2013
Q2 | $1.5M | Buy |
+48,239
| New | +$1.28M | ﹤0.01% | 1143 |
|
Other funds holding ALNY
American Century Companies's ALNY Position: Q2 2026 in Review
American Century Companies increased its Alnylam Pharmaceuticals (ALNY) stake by 2.9% in Q2 2026, buying an estimated $15.6M and bringing the position to 1,853,956 shares worth $558M. The position accounts for 0.25% of the portfolio, ranked #43.
American Century Companies first reported a position in ALNY in Q2 2013 and has held it in 48 quarters since. The position peaked at $748M in Q3 2025. 788 funds tracked by Wall St. Rank hold ALNY as of Q2 2026.
- American Century Companies held 1,853,956 shares of Alnylam Pharmaceuticals worth $558M as of Q2 2026.
- American Century Companies bought 51,593 Alnylam Pharmaceuticals shares in Q2 2026, an estimated $15.6M.
- Alnylam Pharmaceuticals made up 0.25% of American Century Companies's portfolio in Q2 2026, its #43 holding.
- American Century Companies first reported a position in Alnylam Pharmaceuticals in Q2 2013 and has held it in 48 quarters since.
- American Century Companies's Alnylam Pharmaceuticals position peaked at $748M in Q3 2025.
- 788 funds tracked by Wall St. Rank held Alnylam Pharmaceuticals as of Q2 2026.
Based on American Century Companies's 13F filing for Q2 2026, filed 12 Aug 2026.