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.
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