(Fabrinet IPO added.)

NEW YORK ( TheStreet) -- Two more privately-held companies are looking to enter the market, Ironwood Pharmaceuticals and Fabrinet.

Ironwood is planning an initial public offering of up to $172.5 million in stock.

The company is developing linaclotide, a treatment for irritable bowel syndrome, and will use proceeds from the offering to fund the drug, as well as other projects.

Ironwood plans to trade under the ticker "IRWD" on the Nasdaq.

Fabrinet, which manufactures components for optical communication systems and other products, expects to raise $150 million in its IPO. It has applied for listing on the new York Stock Exchange under the ticker "FN."

Last week, five companies came to market in IPOs that totaled $889.5 million.

One of the most successful deals of the week came from Fortinet ( FTNT), as it ranked as the fourth best U.S. debut of 2009.

Other deals came from Archipelago Learning ( ARCL), 7 Days ( SVN), Cloud Peak Energy ( CLD) and Global Defense Technology & Systems ( GTEC).

-- Reported by Jeanine Poggi in New York

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