Marshall Wace Reduces Stake in Uranium Energy Amid Stock Volatility Marshall Wace LLP has trimmed its holdings in Uranium Energy Corp., as UEC shares opened at $4.84 this week, below its 50-day and 200-day averages. The company’s stock, which has a 52-week range of $3.85 to $8.93, continues to face significant price swings and negative earnings.34