IPO日期：2012年4月19日

    2012年大数据引人注目，Splunk藉此东风完成上市。这家公司致力于为美国银行（Bank of America）、康卡斯特（Comcast）等客户搜索和处理海量数据，提供宝贵洞见和可靠数字。

    虽然此前这家公司尚未盈利，属于一家名不见经传的B2B初创企业，但它4月份登陆纽交所（NYSE）的首日表现堪称亮丽。上市首日股价飙升达109%。交易量如此之大，甚至引发了纽交所旨在遏制股价剧烈波动的临时停牌机制。IPO 完成6个月后，Splunk股价较IPO仍有高达85%的涨幅。

    IPO date: 4/19/12

    Big data made a big splash in 2012, and Splunk (SPLK) was there to take advantage of it. The company searches and processes large amounts of data for clients like Bank of America and Comcast, providing them with valuable insights and hard numbers.

    Even though it was an unprofitable, little known business-to-business startup at the time, it had an explosive debut on the NYSE in April. Shares shot up 109% on their first day. Trading in the stock was so intense, it tripped an NYSE circuit breaker put in place to curb volatile trading. Six months after the IPO, Splunk shares were still up an impressive 85%.

    IPO日期：2012年3月28日

    就在今年投资者纷纷涌向云技术和软件公司之际，IPO市场还有着这样一个大赢家：一家生产有机通心粉和奶酪的公司。总部位于加州伯克利的Annie's首日登陆纽交所股价即大涨89%，成为当时自商务社交网站LinkedIn以来今年首日涨幅最大的IPO股票。

    受益于美国人对天然有机食品的需求增长，该股股价继续上涨，6个月后涨幅已高于100%。

    IPO date: 3/28/2012

    While investors flocked to cloud technology and software companies this year, one of the biggest winners in the IPO market was a firm that makes organic mac and cheese. Berkeley, California-based Annie's (BNNY) saw its shares rise by 89% on its opening day on the NYSE, which, at the time, made it the single best IPO performance since LinkedIn the year before.

    Riding the country's growing demand for natural and organic foods, the stock continued to soar, returning well over 100% six months later.

    IPO日期：2012年2月24日

    这家定制机器零部件生产商今年2月底首日上市，开盘报16美元，收于29美元，首日涨幅达81%。Protolabs致力于为客户提供新产品开发所需的原型机和零部件样品，路演时给人印象深刻，投资者反响强烈。

    这宗IPO也是美国制造业复苏的一个迹象。IPO 完成6个月后，该股累计涨幅104%。

    IPO date: 2/24/2012

    The custom machine parts manufacturer opened at $16 a share in late February this year and closed at $29, an increase of 81% on its opening day. Protolabs (PRLB), which makes prototypes and sample parts for companies creating new products, made a big impression on investors during its roadshow and there was an enthusiastic response to the business.

    The IPO was another sign that manufacturing is making a comeback. Six months later, the stock was still up 104%.

    IPO日期：2012年1月25日

    云技术公司在今年的IPO市场中风靡一时，Guidewire更是一马当先。这家为保险公司提供云软件的公司是今年第一只科技IPO股票，1月份以每股13美元的价格上市。

    它首个交易日上涨了32%，此后持续攀升，令买进并持有的投资者喜笑颜开。目前，该股已超过每股30美元，上市以来累计涨幅130%。

    IPO date: 1/25/2012

    Cloud technology companies were all the rage in the IPO market this year and Guidewire (GWRE) was the first to set the trend. The firm, which makes cloud software for the insurance industry, was the first tech IPO of the year, debuting in January at $13 a share.

    It jumped 32% on its first trading day and it has continued to climb since, making its buy-and-hold investors happy. It currently trades at over $30 a share, a gain of 130% since its debut.

    IPO日期：2012年3月2日

    位于旧金山的点评网站Yelp创立于2004年，IPO时尚未盈利，首日仍录得强劲涨幅。首日该股股价飙升64%，进一步推动了投资者对互联网IPO股票的疯狂追逐。

    此后虽然Facebook公司 IPO惨败、坊间普遍对社会媒体股持怀疑态度，但如今的Yelp股价仍比IPO价格高出近50%。

    IPO date: 3/2/2012

    Despite the fact that the San Francisco-based business reviews site had yet to turn a profit since it was founded in 2004, Yelp (YELP) managed to log a strong first-day performance in the public markets. Shares shot up 64% on their opening day, making it yet another IPO feeding the investor frenzy for Internet stocks.

    The shares turned in a solid performance as the year went on, despite the Facebook IPO disaster and general skepticism of social media stock performance -- Yelp is up nearly 50% since the IPO.

    IPO日期：2012年4月25日

    科技股IPO有成功者，也有失败者，Envivio就是今年表现最糟的IPO之一。虽然这家互联网视频网络科技公司的股票4月份上市首日仅跌了6%，但此后一路走低。由于美国和欧洲的很多客户压缩开支，难以赢得知名客户，这家公司在第二、第三季度修正了营收前景。

    IPO完成 6个月后，该股累计下跌76%。目前，该股股价比IPO价格低81%，凸显了今年IPO市场的变幻无常，特别是就科技股而言。

    IPO date: 4/25/2012

    For every big tech IPO win, there was a tech IPO that landed with a thud and Envivio (ENVI) had one of the worst ones of the year. While shares of the Internet video-networking technology firm dipped only 6% on its opening day in April, the stock continued to slide after that. The company revised its revenue outlook in its second and third quarters after struggling to land big name accounts in the US and Europe, where customers tightened their belts.

    Six months later, it was down by 76%. It's currently languishing at 81% below its offering price, proving the fickleness of the IPO market this year, especially when it came to tech.

    IPO日期：2012年5月18日

    编撰2012年IPO排行榜就不能不提现在已被一些人称为十年来（甚至有史以来）最糟的这宗IPO。从Facebook在纳斯达克上市首日的糟糕表现，到获悉其曾经向大型机构投资者选择性披露，整个IPO从头到尾就是一团糟。

    正如安德鲁·罗斯·索金9月份在《纽约时报》(New York Times)上所写，“Facebook的市值在90天内缩水超过了500亿美元。雷曼兄弟（Lehman Brothers）申请破产前一整年的市值缩水幅度也没这么多。”自那以来，Facebook股价有所反弹，但目前比IPO价格低28%。

    IPO date: 5/18/2012

    We couldn't possibly have an end-of-year IPO list without mentioning what some were calling the worst IPO of the decade, if not all time. From a bungled first day of trading on the Nasdaq to disclosures that the company had provided selective information to large institutional investors, the whole thing was a mess from start to finish.

    As Andrew Ross Sorkin wrote in the New York Times in September, "Facebook's market value has dropped more than $50 billion in 90 days. To put that in perspective, that's more market value than Lehman Brothers gave up in the entire year before it filed for bankruptcy." Facebook (FB) has rebounded some since, and it now trades at 28% below its offering price.

    IPO日期：2012年2月2日

    杀毒软件公司AVG Technologies宣布要上市时，人们对其寄予厚望。公司营收正在增长，很多投资者相信从估值看，认为该股具有吸引力。但它上市首日即下跌18.75%，是今年上市首日跌幅最大的一只IPO股票。

    分析师们将此归咎于AVG面临的激烈竞争，赛门铁克（Symantec）、迈克菲（McAfee）等竞争对手已经和个人电脑制造商达成了搭售协议，而AVG则依赖于网络“免费+增值”模式吸引客户。还有人担忧，AVG最成功的产品Safe Search缺乏合适的移动版。IPO 完成6个月后，该股累计下跌已经达到了33%。

    IPO date: 2/2/2012

    Expectations were high for anti-virus maker AVG Technologies (AVG) when it announced its plans to go public. Revenues were growing and many investors believed it was attractive on a valuation basis. But the stock dropped 18.75% on its opening day, the single largest drop for any IPO this year.

    Analysts blamed the heavy competition AVG faced and noted that competitors like Symantec and McAfee had struck tie-in deals with PC makers while AVG relied on attracting customers through its online 'freemium' model. There were also concerns that AVG didn't have a suitable mobile version of Safe Search, its most successful product. Six months later, the stock was down by 33%.