American Capital Senior Floating, Ltd. is a non-diversified closed-end investment management company. The Company's investment objective is to provide attractive, risk-adjusted returns over the long term primarily through current income while seeking to preserve its capital. It manages a leveraged portfolio composed primarily of diversified investments in first lien and second lien floating rate loans principally to the United States-based companies (collectively, Senior Floating Rate Loans or SFRLs), which are referred to as leveraged loans. It invests in equity tranches of collateralized loan obligations (CLOs), which are securitized vehicles collateralized primarily by SFRLs, and it may invest in debt tranches of CLOs. In addition, it may selectively invest in loans issued by middle market companies, mezzanine and unitranche loans and high yield bonds. It has over 80% of its assets in Senior Floating Rate Loans. The Company is managed by American Capital ACSF Management, LLC.