Who holds the copyright for poem Humpty Dumpty?

Nobody knows. Lewis Carrol wrote about Humpty Dumpty in 'Alice through the Looking Glass' and the rhyme is used to teach children about irreversible changes/actions and consequences. First published in about 1810 but dating back to the 17th century, it is thought that the rhyme originally described the destruction in the English Civil War of a Royalist cannon felled from a parapit at St Marys church, during the Parliamentarian seige of Colchester in 1684.