Ballard Power reverses sharply lower on heavy volume The catalyst for the sudden reversal in share price isn't clear at time of writing, but the shares are now lower by over 8.8% at $6.27. The stock had earlier hit highs of $8.38, a fresh 52-week high. The move down to $5.87 nearly erased the last two sessions of gains entirely before a small bounce in price. The $5.87 area is now support. Resistance is at $6.58.