开盘$144.34
昨收$146.94
当日区间$142.80 – $147.48
成交量7.63M
市值$361.73B
市盈率（TTM）148.2
股息率2.32%
股权结构与仓位
谁在持有、谁在做空，以及大资金的流向
机构持股比例81.3%-0.07 个百分点，较上季度
持仓机构数4,456+83 ，较上季度
内部人近期交易41次买入 / 8次卖出净买入
空头持仓比例1.09% 占流通股回补天数 3.0 · 截至 15 Oct 2026
卖空成交量占比18.2%近5日成交量平均占比
卖空成交量占当日成交量比例
大单净流入，近20个交易日
大单买入减卖出的净额（美元）。该窗口期内：−$35.63M（9个净流入日，11个净流出日）。
按单量净流入，近20个交易日
超大单/大单近似机构级别交易；中单/小单近似散户级别交易。各档买入减卖出净额，按窗口期累计。
已披露的前五大股东合计持有27.4%的流通股。
最大股东
按投资者类型
过去6次双周报告中（31 Jul 2026至15 Oct 2026），空头持仓占流通股比例已从1.15%降至1.09%。
近期机构持仓变动
| 股东 | 类型 | 期间 | 持股变动 | 新持股比例 |
|---|---|---|---|---|
| Capital Research | Mutual Fund | 2026/Q3 | +14,919,306 | 0.7% |
| Fisher Investments | Mutual Fund | 2026/Q3 | +12,079,979 | 1.6% |
| Charles Schwab Investment Management | Mutual Fund | 2026/Q3 | +4,600,394 | 2.2% |
| Franklin Resources | Mutual Fund | 2026/Q3 | +3,000,235 | 0.7% |
| Dimensional Fund Advisors | Mutual Fund | 2026/Q3 | +2,030,447 | 0.7% |
| Assenagon Asset Management S.A. | Mutual Fund | 2026/Q3 | +1,959,778 | 0.1% |
| Wellington Management Group | Mutual Fund | 2026/Q3 | +1,934,312 | 3.5% |
| AllianceBernstein | Mutual Fund | 2026/Q3 | +1,830,456 | 0.5% |
| FMR | Mutual Fund | 2026/Q3 | +1,533,457 | 1.3% |
| Goldman Sachs Asset Management, L.P. | Mutual Fund | 2026/Q3 | +1,418,498 | 0.6% |
| SG Americas Securities, LLC | Private Company | 2026/Q3 | +1,406,722 | 0.1% |
| Voya Investment Management LLC | Mutual Fund | 2026/Q3 | +1,324,929 | 0.3% |
| Geode Capital Management, LLC | Mutual Fund | 2026/Q3 | +1,186,060 | 2.5% |
| BlackRock | Mutual Fund | 2026/Q3 | +1,169,507 | 9.2% |
| Columbia Management Investment Advisers, LLC | Mutual Fund | 2026/Q3 | +1,124,727 | 0.7% |
按报告期列出的机构买卖动态，变动幅度从大到小排列。
内部人交易
| 日期 | 内部人 | 职位 | 交易类型 | 股数 | 价格 | 交易后持股 |
|---|---|---|---|---|---|---|
| 29 Sep 2026 | Christine Seidman | Independent Director | Other Derivative Acquisition | +55 | – | 21,490 |
| 29 Sep 2026 | Surendralal Karsanbhai | Independent Director | Other Derivative Acquisition | +111 | – | 5,667 |
| 29 Sep 2026 | Mary Coe | Independent Director | Other Derivative Acquisition | +206 | – | 32,420 |
| 31 Aug 2026 | Gaurav Gupta | Executive Vice President and Chief Information & Digital Officer | Initial Statement of Beneficial | +0 | – | 19,443 |
| 12 Aug 2026 | Chirfi Guindo | Executive Vice President of Strategic Access, Policy & Communications | Open Market Disposition | -10,000 | $135.00 | 36,670 |
| 11 Aug 2026 | Jennifer Zachary | Executive Vice President | Open Market Disposition | -25,388 | $133.46 | 45,509 |
| 11 Aug 2026 | Jennifer Zachary | Executive Vice President | Derivative Exercise and Sale | -54,927 | $133.46 | 45,509 |
| 11 Aug 2026 | Richard DeLuca | Executive VP & President of Merck Animal Health | Open Market Disposition | -45,320 | $132.35 | 111,488 |
| 5 Aug 2026 | Richard DeLuca | Executive VP & President of Merck Animal Health | Open Market Disposition | -6,050 | $131.02 | 156,808 |
| 5 Aug 2026 | Chirfi Guindo | Executive Vice President of Strategic Access, Policy & Communications | Open Market Disposition | -15,000 | $131.00 | 46,670 |
| 4 Aug 2026 | David Williams | Former Executive VP and Chief Information & Digital Officer | Derivative Exercise and Sale | -52,847 | $128.77 | 31,716 |
| 4 Aug 2026 | David Maraldo | Executive VP & President of Merck Manufacturing Division | Derivative Exercise and Sale | -18,706 | $128.72 | 26,572 |
| 29 Jun 2026 | Christine Seidman | Independent Director | Other Derivative Acquisition | +63 | – | 21,291 |
| 29 Jun 2026 | Surendralal Karsanbhai | Independent Director | Other Derivative Acquisition | +126 | – | 5,519 |
| 29 Jun 2026 | Mary Coe | Independent Director | Other Derivative Acquisition | +233 | – | 31,999 |
| 28 May 2026 | Pamela Craig | Independent Director | Other Derivative Acquisition | +1,853 | – | 34,945 |
| 28 May 2026 | Patricia Russo | Independent Director | Other Derivative Acquisition | +1,853 | – | 62,391 |
| 28 May 2026 | Thomas Glocer | Lead Independent Director | Other Derivative Acquisition | +1,853 | – | 110,912 |
| 28 May 2026 | Risa Lavizzo-Mourey | Independent Director | Other Derivative Acquisition | +1,853 | – | 17,749 |
| 28 May 2026 | Douglas Baker | Independent Director | Other Derivative Acquisition | +1,853 | – | 11,518 |
数据来自Form 4/Form 144申报文件。负数为减持（出售、赠予或代扣税款股份），正数为增持。
空头持仓（按报告期）
| 报告日期 | 空头股数 | 占流通股比例 | 回补天数 |
|---|---|---|---|
| 15 Oct 2026 | 26,825,098 | 1.1% | 3.0 |
| 30 Sep 2026 | 28,271,750 | 1.1% | 2.5 |
| 15 Sep 2026 | 34,430,712 | 1.4% | 4.2 |
| 31 Aug 2026 | 30,287,347 | 1.2% | 2.2 |
| 14 Aug 2026 | 24,506,520 | 1.0% | 2.8 |
| 31 Jul 2026 | 28,281,375 | 1.1% | 3.3 |
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