-GameStop Corp shares fell 12% on Monday after the video game retailer said it may sell up to $1 billion worth of stock as it takes advantage of a dizzying rally in its shares this year on the back of a Reddit-driven retail trading frenzy.

The company said it would sell up to 3.5 million shares and use the proceeds to speed up the shift in its business model to e-commerce in an overhaul being led by top shareholder and board member Ryan Cohen.