| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| GROUP ONE TRADING, L.P. | 23 | 6 | 0.00% | 0.00% | 0.03% | Q2 2013 | Q3 2023 | 36 |
| SIMPLEX TRADING, LLC | 35 | 35 | 0.00% | 0.00% | 0.08% | Q1 2015 | Q3 2023 | 35 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 21 | 21 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q3 2023 | 21 |
| SABBY MANAGEMENT, LLC | 5 | 1 | 0.01% | 0.34% | 1.06% | Q1 2014 | Q3 2018 | 13 |
| Citadel Advisors | 13 | 13 | 0.00% | 0.00% | 0.00% | Q2 2013 | Q2 2016 | 13 |
| Timber Hill LLC | 6 | 1 | 0.00% | 0.00% | 0.01% | Q2 2013 | Q4 2016 | 12 |
| JANE STREET GROUP, LLC | 6 | 6 | 0.00% | 0.00% | 0.00% | Q2 2022 | Q3 2023 | 6 |
| JPMORGAN CHASE & CO | 4 | 1 | 0.00% | 0.00% | 0.00% | Q4 2017 | Q3 2023 | 6 |
| Baillie Gifford | 1 | 1 | 0.00% | 0.00% | 0.00% | Q4 2020 | Q4 2020 | 1 |
| Tamarack Advisers, LP | 1 | 1 | 0.20% | 0.20% | 0.20% | Q3 2018 | Q3 2018 | 1 |
| CIBC WORLD MARKETS CORP | 1 | 1 | 0.00% | 0.00% | 0.00% | Q4 2022 | Q4 2022 | 1 |
This page lists all the filers that currently own ALKERMES PLC or have owned ALKERMES PLC in the past.