Eight initial public offerings are scheduled to price and begin trading the week of Sept. 21 in what is likely to become the busiest week for U.S. IPOs since December 2007.

The IPOs, from a broad array of companies, are expected to raise $3.5 billion in proceeds. Please see

Below is a list of the IPOs on deck in order of expected pricing date. All are expected to begin trading the day after they price. Dates and deal terms could change before an IPO prices.

 SEPTEMBER 22:
 COLONY FINANCIAL INC:
 Estimated proceeds: $500 million - 25 mln shares, $20 each
 Lead managers: Bank of America Merrill Lynch, Goldman Sachs, Morgan
 Stanley and UBS Investment Bank
 Ticker/Exchange: CLNY on the New York Stock Exchange
 Company: newly organized real estate finance company that will acquire,
 originate and manage a portfolio of real estate-related debt instruments
 APOLLO COMMERCIAL REAL ESTATE FINANCE: 
 Estimated proceeds: $400 million - 20 mln shares, $20 each
 Lead managers: JP Morgan, Citi, Barclays Capital
 Ticker/Exchange: ARI on NYSE
 Company: the private-equity backed REIT will originate, invest in, acquire
 and manage senior performing commercial real estate mortgage loans and
 commercial mortgage-backed securities.
 VITACOST.COM INC: VITC.O
 Estimated proceeds: $132 mln - 11 mln shares, $11-$13
 Lead managers: Jefferies & Co and Oppenheimer & Co
 Ticker/Exchange: VITC on Nasdaq
 Company: online retailer and direct marketer of dietary supplements
 SEPTEMBER 23:
 ARTIO GLOBAL INVESTORS INC: 
 Estimated proceeds: $585 mln - 23.4 mln shares, $24-$26
 Lead manager: Goldman Sachs
 Ticker/Exchange: ART on NYSE
 Company: U.S. asset management arm of Swiss Bank Julius Baer
 A123 SYSTEMS INC: 
 Estimated proceeds: $225 million - 25.7 mln shares, $8-$9.50
 Lead managers: Morgan Stanley, Goldman Sachs
 Ticker/Exchange: AONE on Nasdaq
 Company: Designs, develops, manufactures and sells advanced, rechargeable
 lithium-ion batteries and battery systems used by carmakers.
 SEPTEMBER 24
 SHANDA GAMES LTD:
 Estimated proceeds: $725 mln - 63 mln ADRs, $10.50-$12.50
 Lead managers: Goldman Sachs (Asia), JP Morgan
 Ticker/Exchange: GAME on Nasdaq
 Company: Gaming unit of Chinese media co Shanda Interactive 
 FOURSQUARE CAPITAL CORP: 
 Estimated proceeds:$500 mln - 25 mln shares, $20
 Lead managers: Bank of America Merrill Lynch, Morgan Stanley
 Ticker/Exchange: FSQR on NYSE
 Company: A REIT created by asset manager AllianceBernstein in part
 to buy toxic assets under U.S. Treasury program
 SELECT MEDICAL HOLDINGS CORP: SEM.N
 Estimated proceeds: $400 mln - 33.3 mln shares, $11-$13
 Lead managers: Goldman Sachs, Morgan Stanley, Bank of America Merrill
 Lynch, JP Morgan.
 Ticker/Exchange: SEM on NYSE
 Company: operator of specialty hospitals, outpatient rehabilitation
 clinics.
 Source: U.S. Securities and Exchange Commission filings, underwriters 
 (Writing by Phil Wahba)