Citadel Advisors (Ken Griffin) — ALXN Trade History
Quarter-by-quarter changes in the ALEXION PHARMACEUTICALS INC position · CUSIP 015351109
Sold outFirst seen: 2015 Q4
| Quarter | Filed | Activity | Shares | Δ Shares | Δ % | Value | % Port. |
|---|---|---|---|---|---|---|---|
| 2026 Q2 | 2026-09-02 | — | — | — | — | — | — |
| 2026 Q1 | 2026-05-15 | — | — | — | — | — | — |
| 2025 Q4 | 2026-02-17 | — | — | — | — | — | — |
| 2025 Q3 | 2025-11-14 | — | — | — | — | — | — |
| 2025 Q2 | 2025-08-14 | — | — | — | — | — | — |
| 2025 Q1 | 2025-05-15 | — | — | — | — | — | — |
| 2024 Q4 | 2025-02-14 | — | — | — | — | — | — |
| 2024 Q3 | 2024-11-14 | — | — | — | — | — | — |
| 2024 Q2 | 2024-08-14 | — | — | — | — | — | — |
| 2024 Q1 | 2024-05-15 | — | — | — | — | — | — |
| 2023 Q4 | 2024-02-14 | — | — | — | — | — | — |
| 2023 Q3 | 2023-11-14 | — | — | — | — | — | — |
| 2023 Q2 | 2023-08-14 | — | — | — | — | — | — |
| 2023 Q1 | 2023-05-15 | — | — | — | — | — | — |
| 2022 Q4 | 2023-02-14 | — | — | — | — | — | — |
| 2022 Q3 | 2022-11-14 | — | — | — | — | — | — |
| 2022 Q2 | 2022-08-15 | — | — | — | — | — | — |
| 2022 Q1 | 2022-05-16 | — | — | — | — | — | — |
| 2021 Q3 | 2022-03-11 | — | — | — | — | — | — |
| 2021 Q4 | 2022-02-14 | Sold out | — | -3,248,848 | -100.0% | — | — |
| 2021 Q2 | 2021-08-16 | Add | 3,248,848 | 745,676 | +29.8% | $596.8M | 0.13% |
| 2021 Q1 | 2021-05-21 | Add | 2,503,172 | 1,675,222 | +202.3% | $382.8M | 0.09% |
| 2020 Q4 | 2021-02-16 | Add | 827,950 | 286,243 | +52.8% | $129.4M | 0.03% |
| 2020 Q3 | 2020-11-16 | Reduce | 541,707 | -587,984 | -52.0% | $62.0M | 0.02% |
| 2020 Q2 | 2020-08-14 | Reduce | 1,129,691 | -1,746,572 | -60.7% | $126.8M | 0.04% |
| 2020 Q1 | 2020-05-15 | Add | 2,876,263 | 2,806,057 | +3996.9% | $258.3M | 0.12% |
| 2019 Q4 | 2020-02-14 | New | 70,206 | 70,206 | — | $7.6M | 0.00% |
| 2019 Q2 | 2020-02-14 | — | — | — | — | — | — |
| 2018 Q4 | 2019-11-14 | Sold out | — | -87,095 | -100.0% | — | — |
| 2019 Q3 | 2019-11-14 | New | 87,095 | 87,095 | — | $8.5M | 0.00% |
| 2018 Q2 | 2019-08-14 | — | — | — | — | — | — |
| 2018 Q3 | 2019-05-15 | Sold out | — | -70,489 | -100.0% | — | — |
| 2019 Q1 | 2019-05-15 | New | 70,489 | 70,489 | — | $9.5M | 0.01% |
| 2018 Q1 | 2019-02-14 | Sold out | — | -1,986,216 | -100.0% | — | — |
| 2017 Q4 | 2018-02-09 | Add | 1,986,216 | 1,254,689 | +171.5% | $237.5M | 0.14% |
| 2017 Q3 | 2017-11-09 | Reduce | 731,527 | -385,221 | -34.5% | $102.6M | 0.08% |
| 2017 Q2 | 2017-08-11 | New | 1,116,748 | 1,116,748 | — | $135.9M | 0.12% |
| 2017 Q1 | 2017-05-12 | — | — | — | — | — | — |
| 2016 Q4 | 2017-02-10 | — | — | — | — | — | — |
| 2015 Q4 | 2017-01-31 | — | — | — | — | — | — |
Share counts are split-adjusted. Time held counts consecutive quarters ending with the latest filing; more than ten years shows as ">10 Years".
13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.