Amphastar Pharmaceuticals（AMPH）今日盘前股价大涨5.63%，引起投资者广泛关注。
消息面上，知名分析机构Needham对Amphastar Pharmaceuticals的投资评级从"持有"上调至"买入"。这一积极的评级调整反映了分析师对公司未来发展前景的看好，成为推动股价上涨的主要催化剂。
Needham的评级上调可能基于Amphastar Pharmaceuticals近期的业务表现、产品管线进展或市场竞争地位的改善。然而，具体的上调理由尚未披露。投资者普遍认为，这一评级变化表明该公司在制药行业的发展潜力得到了专业分析师的认可，从而带动了股价的强劲上涨。
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