Blackstone's Byron Wien believes the rally is in a danger zone.
Wien said speculation in the market could reach an extreme as the U.S. economy has a better year than 2017.
Despite the rough start to the year, Blackstone's Byron Wien told CNBC he thinks the S&P 500 will produce a 15 percent return for 2015.
How will the economy and markets play in 2014? What about Hillary Clinton and Ted Cruz? Blackstone Advisory Partners' Byron Wien gives his annual new year's predictions.
12 golden rules.
Byron Wien, Vice Chairman, Blackstone Advisory Partners, has issued his list of Surprises for 2012.
Lukasz Fabianski's rare error ended up proving costly for West Ham United on Monday night.
Neil Lennon is edging ever closer to guiding Celtic to nine Premiership title in a row
Mikel Arteta's Arsenal side managed to pick up their third victory in the space of a week on Sunday against Everton.
The Leeds United new boy is struggling to reach the required fitness.
West Ham United managed to give Liverpool a scare last night, but David Moyes's side just could not hang on.
Tottenham Hotspur were without Ryan Sessegnon on Saturday.
Tottenham Hotspur striker Troy Parrott has still only been given one appearance since Jose Mourinho took over.
West Ham United midfielder Tomas Soucek has picked up an injury, which could leave him on the sidelines.
Anthony Gordon has admitted that training with Everton's first-team and Carlo Ancelotti is a major challenge.
Liverpool are now four wins away from becoming Premier League champions.