Amphastar 制药 AMPH
$28.49 +$0.83 (+3.00%)
休市 · Nov 6, 8:10 pm ET · 最新盘后价 $28.49 0.00%
开盘$29.44
昨收$27.66
当日区间$27.80 – $31.00
成交量826.3K
市值$1.22B
市盈率（TTM）13.1
股息率–
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84.1%+0.10 个百分点，较上季度
持仓机构数271+6 ，较上季度
内部人近期交易23次买入 / 27次卖出净卖出
空头持仓比例10.19% 占流通股回补天数 9.9 · 截至 15 Oct 2026
卖空成交量占比17.2%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：−$1.02M（10个净流入日，10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44.0%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11.18%降至10.19%。
近期机构持仓变动
| 股东 | 类型 | 期间 | 持股变动 | 新持股比例 |
|---|---|---|---|---|
| Nuveen Asset Management LLC | Insurance Company | 2026/Q3 | +72,728 | 0.2% |
| Hudson River Trading LLC | Private Company | 2026/Q3 | +331,349 | 0.9% |
| Dimensional Fund Advisors | Mutual Fund | 2026/Q3 | +277,160 | 5.4% |
| D. E. Shaw & Co., L.P. | Hedge Fund | 2026/Q3 | +221,506 | 2.1% |
| American Century Investment Management | Mutual Fund | 2026/Q3 | +159,088 | 2.8% |
| AQR Capital Management | Hedge Fund | 2026/Q3 | +128,285 | 0.5% |
| Two Sigma Investments, LP | Hedge Fund | 2026/Q3 | +109,967 | 0.6% |
| Denali Advisors, LLC | Mutual Fund | 2026/Q3 | +109,500 | 0.9% |
| The Goldman Sachs Group, Inc. | Public Company | 2026/Q3 | +101,270 | 0.8% |
| First Trust Advisors L.P. | Mutual Fund | 2026/Q3 | +96,360 | 0.6% |
| Jane Street Group, LLC | Private Company | 2026/Q3 | +86,259 | 0.4% |
| Goldman Sachs Asset Management, L.P. | Mutual Fund | 2026/Q3 | +74,702 | 0.4% |
| Algert Global LLC | Hedge Fund | 2026/Q3 | +69,040 | 0.3% |
| Leap Investments LP | Mutual Fund | 2026/Q3 | +56,700 | 0.1% |
| O'Shaughnessy Asset Management, LLC | Mutual Fund | 2026/Q3 | +55,498 | 0.4% |
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 |
|---|---|---|---|---|---|---|
| 20 Sep 2026 | William Peters | CFO, Executive VP of Finance, Treasurer & Director | Automatic Disposition | -4,139 | $25.00 | 66,753 |
| 15 Sep 2026 | Rong Zhou | Senior EVP of Production & EVP of Scientific Affairs | Derivative Exercise and Sale | -10,000 | $23.94 | 205,877 |
| 1 Sep 2026 | Rong Zhou | Senior EVP of Production & EVP of Scientific Affairs | Open Market Disposition | -3,187 | $23.63 | 205,877 |
| 31 Aug 2026 | Rong Zhou | Senior EVP of Production & EVP of Scientific Affairs | Intent to Sell (Form 144) | -13,187 | $22.00 | – |
| 10 Aug 2026 | Richard Prins | Lead Independent Director | Open Market Disposition | -7,973 | $20.30 | 21,482 |
| 6 Aug 2026 | William Peters | CFO, Executive VP of Finance, Treasurer & Director | Automatic Disposition | -3,127 | $22.48 | 70,892 |
| 6 Aug 2026 | William Peters | CFO, Executive VP of Finance, Treasurer & Director | Derivative Exercise and Sale | -5,053 | $22.48 | 70,892 |
| 8 Jul 2026 | Anthony Pierce | Independent Director | Other Acquisition | +7,886 | – | 7,886 |
| 8 Jul 2026 | Anthony Pierce | Independent Director | Other Derivative Acquisition | +16,646 | $19.02 | 16,646 |
| 1 Jun 2026 | Shiren S. Lee | Independent Director | Sale to Issuer | -769 | $18.45 | 151,207 |
| 31 May 2026 | Michael Zasloff | Independent Director | Other Acquisition | +8,143 | – | 13,265 |
| 31 May 2026 | Michael Zasloff | Independent Director | Other Derivative Acquisition | +17,365 | $18.42 | 17,365 |
| 31 May 2026 | Richard Prins | Lead Independent Director | Other Acquisition | +8,143 | – | 13,265 |
| 31 May 2026 | Richard Prins | Lead Independent Director | Other Derivative Acquisition | +17,365 | $18.42 | 17,365 |
| 31 May 2026 | Shiren S. Lee | Independent Director | Other Acquisition | +8,143 | – | 8,143 |
| 31 May 2026 | Shiren S. Lee | Independent Director | Other Derivative Acquisition | +17,365 | $18.42 | 17,365 |
| 31 May 2026 | Gayle Deflin | Independent Director | Other Acquisition | +8,143 | – | 13,265 |
| 31 May 2026 | Gayle Deflin | Independent Director | Other Derivative Acquisition | +17,365 | $18.42 | 17,365 |
| 31 May 2026 | David Gaugh | Independent Director | Other Acquisition | +8,143 | – | 14,447 |
| 31 May 2026 | David Gaugh | Independent Director | Other Derivative Acquisition | +17,365 | $18.42 | 17,365 |
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 | 4,333,767 | 10.2% | 9.9 |
| 30 Sep 2026 | 4,405,038 | 10.4% | 7.1 |
| 15 Sep 2026 | 4,994,808 | 11.7% | 10.8 |
| 31 Aug 2026 | 5,134,473 | 12.1% | 15.4 |
| 14 Aug 2026 | 5,385,239 | 12.7% | 10.0 |
| 31 Jul 2026 | 4,928,331 | 11.2% | 11.9 |
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