Under the MoU, both associations will build on the synergy between their organisations. : The ACI UK, a trade association operating in the foreign exchange (forex), money and derivative markets, announced on Tuesday evening that it has signed a Memorandum of Understanding (MoU) with The Society of Technical Analysts (STA). ACI UK represents individuals engaged in professional trading, broking, operations, regulatory and compliance activities. The STA is a not for profit organisation which aims to bring a greater understanding of technical analysis to the global investment community.