Symphony Technology Group, a private equity firm, completed an investment in CadmiumCD, a provider of event technology software. Financial terms were not disclosed. "Michelle, Peter and the CadmiumCD team have built an industry-leading portfolio of products and are positioned for expansion in a large and underpenetrated market. We are excited to work with the CadmiumCD team to lead the business into this next phase of growth," William Chisholm, STG Managing Partner.