Scholastic

Scholastic is the name of the publishing company that published the Harry Potter Series and its complementary novels in the United States and Canada. It is the only company to have published J.K. Rowling's novels in English besides Bloomsbury, the original publisher.

Singularity of Scholastic Harry Potter books
The main difference between Scholastic and Bloomsbury editions of the books is the covers and the spelling (Scholastic uses American spelling for words such as symbolise, which is spelt as symbolize). Also, the title of the first novel differs between the two publishers. Bloombsbury published the first novel as Harry Potter and the Philosopher's Stone, whereas in America and Canada the novel was published as Harry Potter and the Sorcerer's Stone.