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Senator Investment Group LP
> MRK
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | Merck & Co., Inc. | MRK | 405,000 | -245,000 | 46,732,950,000 | -22,420,550,000 | $115,390.00 |
| 03/31/2023 | Merck & Co., Inc. | MRK | 650,000 | 650,000 | 69,153,500,000 | 69,153,500,000 | $106,390.00 |
| 09/30/2019 | Merck & Co., Inc. | MRK | 0 | -2,000,000 | 0 | -167,700,000 | |
| 06/30/2019 | Merck & Co., Inc. | MRK | 2,000,000 | -500,000 | 167,700,000 | -40,225,000 | $83.85 |
| 03/31/2019 | Merck & Co., Inc. | MRK | 2,500,000 | 0 | 207,925,000 | 16,900,000 | $83.17 |
| 12/31/2018 | Merck & Co., Inc. | MRK | 2,500,000 | -1,250,000 | 191,025,000 | -75,000,000 | $76.41 |
| 09/30/2018 | Merck & Co., Inc. | MRK | 3,750,000 | -955,000 | 266,025,000 | -19,569,000 | $70.94 |
| 06/30/2018 | Merck & Co., Inc. | MRK | 4,705,000 | 4,705,000 | 285,594,000 | 285,594,000 | $60.70 |
| 09/30/2011 | Merck & Co., Inc. | MRK | 0 | -3,000,000 | 0 | -105,870,000 | |
| 06/30/2011 | Merck & Co., Inc. | MRK | 3,000,000 | 0 | 105,870,000 | 6,840,000 | $35.29 |
| 03/31/2011 | Merck & Co., Inc. | MRK | 3,000,000 | 1,000,000 | 99,030,000 | 26,950,000 | $33.01 |
| 12/31/2010 | Merck & Co., Inc. | MRK | 2,000,000 | 250,000 | 72,080,000 | 6,718,000 | $36.04 |
| 09/30/2010 | Merck & Co., Inc. | MRK | 0 | -1,750,000 | 0 | -65,362,000 | |
| 06/30/2010 | Merck & Co., Inc. | MRK | 2,000,000 | 250,000 | 69,940,000 | 4,578,000 | $34.97 |
| 03/31/2010 | Merck & Co., Inc. | MRK | 1,750,000 | 1,750,000 | 65,362,000 | 65,362,000 | $37.35 |
| 12/31/2009 | Merck & Co., Inc. | MRK | 850,000 | 850,000 | 31,059,000 | 31,059,000 | $36.54 |
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