Citadel Advisors (Ken Griffin) — MRK Trade History
Quarter-by-quarter changes in the MERCK & CO INC position · CUSIP 58933Y105
Currently held · 1 YearFirst seen: 2015 Q4split-adjusted
| Quarter | Filed | Activity | Shares | Δ Shares | Δ % | Value | % Port. |
|---|---|---|---|---|---|---|---|
| 2026 Q2 | 2026-09-02 | Reduce | 1,933,667 | -1,887,560 | -49.4% | $248.5M | 0.03% |
| 2026 Q1 | 2026-05-15 | Reduce | 3,821,227 | -3,000,104 | -44.0% | $459.7M | 0.07% |
| 2025 Q4 | 2026-02-17 | Add | 6,821,331 | 5,853,277 | +604.6% | $718.0M | 0.11% |
| 2025 Q3 | 2025-11-14 | New | 968,054 | 968,054 | — | $81.2M | 0.01% |
| 2025 Q2 | 2025-08-14 | Sold out | — | -2,048,739 | -100.0% | — | — |
| 2025 Q1 | 2025-05-15 | Reduce | 2,048,739 | -3,232,971 | -61.2% | $183.9M | 0.04% |
| 2024 Q4 | 2025-02-14 | Reduce | 5,281,710 | -1,759,979 | -25.0% | $525.4M | 0.09% |
| 2024 Q3 | 2024-11-14 | Reduce | 7,041,689 | -1,200,378 | -14.6% | $799.7M | 0.15% |
| 2024 Q2 | 2024-08-14 | Add | 8,242,067 | 666,847 | +8.8% | $1.02B | 0.21% |
| 2024 Q1 | 2024-05-15 | Add | 7,575,220 | 1,257,049 | +19.9% | $999.6M | 0.19% |
| 2023 Q4 | 2024-02-14 | Reduce | 6,318,171 | -358,936 | -5.4% | $688.8M | 0.14% |
| 2023 Q3 | 2023-11-14 | Add | 6,677,107 | 4,837,236 | +262.9% | $687.4M | 0.15% |
| 2023 Q2 | 2023-08-14 | Add | 1,839,871 | 1,068,727 | +138.6% | $212.3M | 0.04% |
| 2023 Q1 | 2023-05-15 | Reduce | 771,144 | -1,715,524 | -69.0% | $82.0M | 0.02% |
| 2022 Q4 | 2023-02-14 | Reduce | 2,486,668 | -900,548 | -26.6% | $275.9M | 0.06% |
| 2022 Q3 | 2022-11-14 | Add | 3,387,216 | 1,231,726 | +57.1% | $291.7M | 0.07% |
| 2022 Q2 | 2022-08-15 | Reduce | 2,155,490 | -1,233,115 | -36.4% | $196.5M | 0.05% |
| 2022 Q1 | 2022-05-16 | New | 3,388,605 | 3,388,605 | — | $278.0M | 0.06% |
| 2021 Q3 | 2022-03-11 | Sold out | — | -2,217,206 | -100.0% | — | — |
| 2021 Q4 | 2022-02-14 | Reduce | 2,217,206 | -732,904 | -24.8% | $169.9M | 0.04% |
| 2021 Q2 | 2021-08-16 | Reduce | 2,950,110 | -1,641,974 | -35.8% | $229.4M | 0.05% |
| 2021 Q1 | 2021-05-21 | Reduce | 4,592,084 | -586,644 | -11.3% | $337.8M | 0.08% |
| 2020 Q4 | 2021-02-16 | Add | 5,178,728 | 2,969,387 | +134.4% | $404.2M | 0.10% |
| 2020 Q3 | 2020-11-16 | Add | 2,209,341 | 813,904 | +58.3% | $174.9M | 0.05% |
| 2020 Q2 | 2020-08-14 | Reduce | 1,395,437 | -107,143 | -7.1% | $103.0M | 0.04% |
| 2020 Q1 | 2020-05-15 | Add | 1,502,580 | 520,585 | +53.0% | $110.3M | 0.05% |
| 2019 Q4 | 2020-02-14 | New | 981,995 | 981,995 | — | $85.2M | 0.04% |
| 2019 Q2 | 2020-02-14 | — | — | — | — | — | — |
| 2018 Q4 | 2019-11-14 | Sold out | — | -2,771,109 | -100.0% | — | — |
| 2019 Q3 | 2019-11-14 | New | 2,771,109 | 2,771,109 | — | $222.6M | 0.10% |
| 2018 Q2 | 2019-08-14 | — | — | — | — | — | — |
| 2018 Q3 | 2019-05-15 | Sold out | — | -1,331,477 | -100.0% | — | — |
| 2019 Q1 | 2019-05-15 | New | 1,331,477 | 1,331,477 | — | $105.7M | 0.05% |
| 2018 Q1 | 2019-02-14 | Sold out | — | -8,832,989 | -100.0% | — | — |
| 2017 Q4 | 2018-02-09 | Add | 8,832,989 | 8,166,391 | +1225.1% | $474.3M | 0.29% |
| 2017 Q3 | 2017-11-09 | Reduce | 666,598 | -1,963,728 | -74.7% | $40.7M | 0.03% |
| 2017 Q2 | 2017-08-11 | Add | 2,630,326 | 2,204,981 | +518.4% | $160.9M | 0.14% |
| 2017 Q1 | 2017-05-12 | Add | 425,345 | 237,969 | +127.0% | $25.8M | 0.02% |
| 2016 Q4 | 2017-02-10 | Reduce | 187,376 | -317,825 | -62.9% | $10.5M | 0.01% |
| 2015 Q4 | 2017-01-31 | New | 505,201 | 505,201 | — | $25.5M | 0.03% |
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.