Yes, you can! Go to Raise.com > My Accounts > My Listings. On the My Listings page you will be able to filter your listings status by clicking either "View: All" or "Advanced" and filtering by brand, date, and listing status. From here, please filter the cards you would like to edit in bulk. Click the check box in the top left corner to select all listings.
On the first listing, edit the price or selling percentage. This change will be reflected on all of the selected listings.
Always double check your work before clicking "Save Changes". Once saved, the changes are live on the marketplace.