Lincoln Park SPA The price at which shares are sold to Lincoln Park is determined based on a formula set in the Purchase Agreement. For Regular Purchases, the price is 97% of the lesser of the lowest sale price on the Purchase Date or the average of the three lowest closing prices over the ten days preceding the Purchase Date. For Accelerated and Additional Accelerated Purchases, the price is 97% of the lesser of the volume-weighted average price or the closing sale price on the applicable date. The number of shares sold is determined by the company's discretion, subject to certain caps and conditions, such as the market price of the stock and the maximum purchase obligation of Lincoln Park.