A two-home estate in an exclusive Aspen enclave rode a hot market to big off-market sale. The West End property sold for $52.5 million in an off-market deal, according to public records.

Billionaire Bill Koch has listed his expansive Aspen estate for $125 million, a significant increase from the $26.5 million he paid for it in 2007. Shawn O'Connor Billionaire energy mogul Bill ...

Pitching its tent next to billionaires is a start. By Ray Mark Rinaldi Reporting from Aspen, Colo. A down art market? Depressed dealers? Fatigued buyers? None of that matters in Aspen, Colo.

Aspen Technology, Inc. AZPN has announced a definitive agreement with Emerson Electric Co. EMR. Per the deal, EMR will acquire all remaining outstanding shares of Aspen’s common stock that it ...