Quite confusing history and heritage but I’ll try to give an overview on what happened:
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Van Der Ploeg formed PACTON (see Robert1952’s translation of the abbrevation)
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Pacton and Van Weelde formed Pacton-Van Weelde in Nieuwerkerk a/d IJssel
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Van Weelde and Pacton separated and continued on their own
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Paul and Van Weelde formed Paul & Van Weelde in Nieuwerkerk a/d IJssel
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Paul and Van Weelde separated, Paul continued in Zevenhuizen
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Van Weelde continued in Nieuwerkerk a/d IJssel and later renamed Contar
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Pacton was taken over by Nooteboom
To my humble knowledge only Pacton nowadays exists