The 16-year-old wicket-keeper batsman signed a five-year deal in 2020, which will keep him at Glamorgan until at least the end of the 2024 season.
His contract will see him complete the first year of his five-year deal on a development basis, allowing him to finish his GCSEs and train with the first team, before becoming a fully contracted Glamorgan player in 2021.
Horton became one of the youngest players in Glamorgan history to make his debut for the 2nd XI when he played against Gloucestershire in June last year and struck 58 in the first innings.
He currently plays his senior cricket for Newbridge Cricket Club in the South Wales Premier Cricket League where he made his first team debut as a 13-year-old.
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