End Congressional Stock Market Abuse Act of 2017 This bill amends the Securities Exchange Act of 1934 to prohibit Members of Congress from: (1) receiving a discounted purchase price or a premium sales price in a securities transaction, or (2) purchasing a nonpublic offering of a covered security available on a U.S. or foreign exchange. This prohibition shall not apply if the Member of Congress reasonably believes that the discount or premium was obtained in a manner generally available to the public.