Which Protestant denominations support the position that Peter is the rock that Jesus builds his church upon? "And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it." Matt 16:18

It is my understanding that there is still debate amongst Protestant scholars over the interpretation of this scripture, and that there may be partial protestant support for the Primacy of Simon Peter.

Is this true? If so, which denominations of Protestantism support the interpretation that Peter is the rock Christ is referring to?
No Protestant denominations that I know of support Peter being the rock of Mathew 16. They all tend to interpret this passage as Jesus indicating the revelation of who Jesus is being given Peter by the Father, as the 'rock' upon which the church is built.

Some Protestants (individuals) note that Peter appears to have a primary role amoung the apostles, evidenced by the number of times he is mentioned first in the gospels and Acts, and often as 'Peter and the others', etc. They also agree that Peter was a leader in the church at Jerusalem.

Some denominations note that Peter is thought to be Jasper stone in the wall of the New Jerusalem/The Israel of God/The Church, which was the first stone in the wall, listed in Rev. 21. This fulfills Jesus' words, if they were about Peter being a rock upon which He would build His church, the New Jerusalem being a type of the church, and the Israel of God,  and Peter indicated as being a foundation stone in the wall, hence therefore Peter was a 'rock' upon which Jesus 'built his church' in the prophecy of Rev. 21.

This being said and in summary, no Protestant denominations think that Peter is 'the rock' upon which Jesus said He would build His church, and few if any have written about Peter even being 'a rock' in the foundation wall of the New Jerusalem/The Bride/The Church.

This interpretation of Mathew 16, because it is a point upon which the Roman Catholic Church justify the Papacy, is stayed away from by most, if not all of Protestantism.