I really couldn’t say whether there are any denominations that believe that…
Wikipedia for example was very inconclusive about this:
“Although Martin Luther taught that Mary was immaculately conceived, most Protestants today reject the doctrine”
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About the assumption I found the following:
“The Assumption of Mary is a belief held by Christians of the Catholic Church, some Eastern Orthodox Christians, Oriental Orthodoxy, some Protestant churches (including Lutherans and Anglo-Catholics), that the Virgin Mary at the end of her life was physically taken up into heaven.”
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And
“he Prayer Books of the Scottish Episcopal Church and the Anglican Church of Canada mark 15 August as the Falling Asleep of the Blessed Virgin Mary. In the Episcopal Church in the United States of America, the day is observed as a Holy Day of St Mary the Virgin, and in the Church of England the day is a Festival of The Blessed Virgin Mary. In all churches of the Anglican Communion Anglo-Catholics often observe the feast day under the same name as Roman Catholics.
The Anglican-Roman Catholic agreed statement on the Virgin Mary assigns a place for both the Dormition and the Assumption in Anglican devotion.”
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LINK)