New York ( TheStreet)-- Private equity firms are expected to take several portfolio companies public before the end of 2010 as the carried interest tax rates increase.

There are currently 49 financial sponsor backed IPOs that are registered with the Securities and Exchange Commission, which has a 180 day backlog worth a total $17.3bn, according to Dealogic.

HCA Inc

HCA Inc. filed plans for an IPO on the New York Stock Exchange under the ticker symbol "HCA" in May. The IPO could raise up to $4.6 billion. The hospital operator agreed to a $21.3 billion buyout offer from BainCapital LLC, Kohlberg Kravis Roberts & Co., Bank of America Corp.'s ( BAC) BAML Capital Partners, and HCA co-founder Thomas F. Frist Jr. in 2006.

Nielsen Holdings

Nielsen Holdings BV registered to file for an IPO on the New York Stock Exchange under the ticker symbol 'NLSN'. The television-audience rating company is owned by KKR & Co. , Thomas H. Lee Partners , Blackstone Group LP ( BX) , Carlyle Group, AlpInvest Partners and Hellman & Friedman LLC. The IPO could raise $1.75 billion. Nielsen plans to use the proceeds to help pay down its $8.6 billion in debt.

Toys "R" US

Toys "R" Us filed a registration to go public in May on the Nasdaq under the symbol "TOYS". The retailer was taken private by Kohlberg Kravis Roberts & Co. > ( KKR), Bain Capital and Vornado Realty Trust ( VNO) in a $6.6 billion deal in 2005. The retailer could raise as much as $800 million in an IPO.

LPL Investment Holdings Inc.

LPL Investment Holdings Inc. filed to register for an IPO in June under the symbol LPLA. The offering price is expected to be around $600 million. Shares are expected to be listed under the symbol LPLA. LPL Holdings was acquired by private-equity firms Hellman & Friedman LLC and TPG Capital in Dec. 2005.

Aeroflex Holding Corp

Aeroflex registered to file for a public offering in April on the New York Stock Excahnge under the symbol "ARX". The company could raise $500 million in an initial public offering. Veritas Capital, Golden Gate Capital, and Goldman Sachs Capital ( GS) back the company, which provides radio frequency gear and microwave equipment to companies in the aerospace, defense, and medical markets.

FleetCor Technologies Inc.

FleetCor registered to file for an IPO on the New York Stock Exchange in April under the ticker symbol "FLT".The provider of specialized payment products and services to commercial fleets, hopes to raise up to $500 million in the offering. Owners of the company include Nautic Partners, Summit Partners, Bain Capital, Advent International Corp., Advantage Capital Partners and HarbourVest Partners.

Goodman Global Group

Global Group Inc. registered to file for an IPO in May on the Nasdaq. No specific ticker has been assigned. The company, which manufactures heating, ventilation and air conditioning products for residential and light commercial use wants to raise up to $500million. Goodman was acquired by private equity firm Hellman & Friedman LLC for $2.7 billion in 2008. The company wants to use proceeds from the IPO to repay about $1.5 billion in debt.

AMC Entertainment

AMC Entertainment registered to file for an IPO with the ticker "AMC" in July. The movie company did not specify an exchance. Proceeds from the float could reach $450 million. The movie company plans to use the cash to reduce debt. AMC is owned by Apollo ( APOL), Bain Capital, The Carlyle Group, Spectrum Equity Investors CCMP Capital, formerly known as JP Morgan Partners ( JPM).

Affinion Group Holdings

Affinion registered to file for an IPO on the New York Stock Exchange in May. The direct marketing company could raise as much as $400 million in the IPO. No ticker symbol was specified. The company is owned by private equity firm Apollo. The company will use the proceeds from the offering to repay $1.7 billion in outstanding debt.

GNC Holdings

GNC registered to file for an IPO in September under the ticker "GNC" The health and wellness product retailer is planning to sell up to $350 million in common stock. GNC was bought by Ares Management and the Ontario Teachers Pension Plan, Teachers Private Capital in 2007 from Apollo for $750 million.

--Written by Maria Woehr in New York.

To contact the writer of this article, click here: Maria Woehr.

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