BUSINESS

The 10 Biggest U.S. IPOs

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This story has been updated from its publication on Feb.2, 2012.

NEW YORK ( TheStreet) -- Facebook's looming IPO has shone a spotlight on the U.S. IPO market as investors gear up for the largest tech offering ever.

The social networking phenomenon, which could raise up to $13.6 billion , is expected to make its public debut later this month. Facebook will list on the Nasdaq exchange under the symbol "FB" in the year's most eagerly-anticipated IPO.

Last year had its share of headline-grabbing tech IPOs, which included Zynga(ZNGA) , Renren(RENN) , Groupon(GRPN) and LinkedIn(LNKD) . All of these debuts, however, will be dwarfed by Facebook. The Menlo Park, Calif.-based firm estimates that the net proceeds from the sale of its common stock will be approximately $5.67 billion, assuming an IPO price of $31.50 per share, the midpoint of its price range.

Facebook's offering will also surpass Google's(GOOG) 2004 $1.7 billion IPO, up to this point the largest IPO from an American tech company. German semiconductor specialist Infineon Technologies , however, was another mega offering, raising $5.2 billion in its 2000 IPO. The chipmaker opted to delist from the New York Stock Exchange in 2009.

Overall, 2012 looks set to be a decent year for tech companies taking the public plunge . IPO expert Renaissance Capital says that tech firms have accounted for 20 U.S. IPOs valued at more than $50 million this year, the most in any sector. Last year there were 48 tech offerings.

According to Renaissance Capital's research, 2012 tech sector IPOs have generated an average first-day return of 28%. So far this year, tech companies have returned an average of 43.8% from their offer prices, compared to 8.5% in the financial sector and 2.2% in the energy sector.

Although Facebook's deal size is attracting plenty of attention ahead of its IPO, there have been plenty of large non-tech offerings in recent years.

We looked at the 10 largest offerings from U.S. companies, according to Dealogic.

10. HCA Holdings
Background: HCA Holdings (HCA) , the parent company of the Hospital Corp. of America, is a fairly new addition to the top 10 list. The health care services operator underwent an IPO in March 2011, raising $4.4 billion, after being taken private in 2006. Headquartered in Nashville, HCA operates and owns 163 hospitals and 109 freestanding surgery centers as well as diagnostic and imaging centers, radiation and oncology therapy centers, rehabilitation and physical therapy centers and other facilities, according to its profile.

HCA describes itself as the nation's leading provider of healthcare services. Approximately 4% to 5% of all inpatient care delivered in the country today is provided by HCA facilities, the company says.

Stock performance: Shares of HCA have fallen more than 16% since its debut as a public company last year. The stock was down 2.21% Monday at $26.10.