Bill Ackman reveals he's been building a more than $2 billion stake in Uber
1. Bill Ackman disclosed a $2.3 billion stake in Uber. 2. He believes Uber is undervalued compared to its intrinsic value. 3. Uber shares surged over 8% following Ackman's announcement. 4. Despite earlier earnings misses, Uber's stock has recently rallied 25%. 5. Ackman's investment indicates strong confidence in Uber's management and prospects.