Eight initial public offerings are scheduled to price and begin trading by the end of this week 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 $3.3 billion.

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

SEPTEMBER 23:

 COLONY FINANCIAL INC: 
 Estimated proceeds: $250 mln (12.5 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.
 NOTE: Originally scheduled to price Sept.22, and on Sept. 23, it halved its planned offer.
 APOLLO COMMERCIAL REAL ESTATE FINANCE: 
 Estimated proceeds: $200 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.
 NOTE: Originally scheduled to price Sept.22, and on Sept. 23, it halved its planned offer.
 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: $276 million (25.7 mln shares, $10-$11.50)
 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.
 NOTE: On Tuesday, A123 increased the size of its estimated price range to $10-$11.50, from $8-$9.50.
 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 24
 SHANDA GAMES LTD: GAME.Oi
 Estimated proceeds: $960 mln (83.5 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 Entertainment Ltd 
 NOTE: Shanda Games raised the size of the offering to 83.5 million from 63 million ADRs on Wednesday.
 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; editing by Andre Grenon)