长鑫科技上市首日表现强势，收盘市值达3.2万亿元，超越工商银行成为A股市值最高公司[1]。全天成交额突破1400亿元，创造了A股历史上首只单日成交额超千亿的纪录[1]。中一签散户可赚两万多元，93家公募合计获配12.34亿股，静态浮盈接近500亿元[1]。
从基本面看，长鑫一季度营收508亿元同比增长719%，净利润330.12亿元，净利率达65%[1]。值得注意的是，长鑫自2016年成立至2025年上半年累计亏损约408.6亿元，而一个季度的净利基本收回了9年的亏损[1]。
然而，这一景象引发了市场关于估值泡沫的思考。文章将长鑫首日表现与2007年中石油上市时的情景进行对比[1]。中石油于2007年11月5日上市，首日收盘价43.96元，A股总市值约7.12万亿元，当天同样大幅超预期[1]。中石油当天成交额接近700亿，占沪市总成交额44.5%[1]。按A股价格外推，中石油总市值曾超过7万亿人民币，一度超过埃克森美孚成为全球市值最高公司[1]。
分析指出，两个事件都呈现出相似的特征：市场站在产业周期高点，被共识和情绪驱动，虽然存储行业基本面向好，但估值已大幅提前透支[1]。市场数据显示，截至2026年7月22日，A股"大盘拥挤度"达54.19%，前5%个股贡献全市场54.19%成交额[1]。在全球市场中，美光股价过去一年半从61.419美元涨至1132.330美元，累计涨幅1743.62%，瑞银给其目标估值1.833万亿美元[1]。与此同时，KOSPI指数从历史高点回撤35.5%，SK海力士几近腰斩，超120万韩国散户杠杆账户触发追加保证金，32万至36万账户已被强制平仓[1]。
Changxin Technology surged 465% on its first trading day, reaching a market capitalization of 3.2 trillion yuan and overtaking the Industrial and Commercial Bank of China as the most valuable company on the Shanghai-Shenzhen Stock Exchange [1]. The stock generated a single-day trading volume exceeding 1.4 trillion yuan, marking the first time in A-share history that a single stock has exceeded this threshold [1].
The stellar performance delivered substantial gains for retail investors, with holders of a single lot earning over 20,000 yuan, while 93 public fund managers collectively received allocations of 1.234 billion shares and accumulated unrealized gains approaching 500 billion yuan [1]. Behind the frenzy lies impressive financial performance: in the first quarter, Changxin reported revenues of 508 billion yuan, representing a 719% year-over-year increase, and net profit of 330.12 billion yuan, yielding a net margin of 65% [1]. Notably, the company accumulated losses of approximately 408.6 billion yuan from its founding in 2016 through the first half of 2025—a shortfall effectively recovered in a single quarter [1].
The market dynamics surrounding Changxin's listing mirror historical patterns seen during China's previous speculative episodes. When China National Petroleum Corporation debuted on November 5, 2007, its A-share price closed at 43.96 yuan, also dramatically exceeding expectations [1]. That day's trading volume reached approximately 700 billion yuan, accounting for 44.5% of Shanghai exchange turnover, and the company's externalized total market value surpassed 7 trillion yuan, temporarily exceeding ExxonMobil to become the world's most valuable company [1]. The convergence of euphoria, consensus-driven buying, and front-loading of industry growth prospects characterizes both episodes, raising questions about valuation sustainability as the semiconductor sector stands at a cyclical peak [1].