ACT(S) is a non-profit organisation of individual memberships drawn from corporate treasurers and finance professionals involved in corporate treasury work.

Members are typically in corporate organisations on the buy-side of the marketplace. Established in 1991 as the Treasurer's Club, the association has grown in numbers and spread. As Singapore increasingly become a treasury hub, membership now include group and regional corporate treasurers, treasury centre managers and other professional whose treasury activities cover a wide geographical spread.