S&P Global Ratings' negative outlook on WEX reflects a slowing economy, uncertainty about the company's ability to walk away from recent debt-financed acquisitions, and elevated leverage. We expect net debt to EBITDA to exceed 6.0x, funds from operations (FFO) to debt to be 10%-20%, and interest coverage to be 3.0x-4.0x through 2022. We could lower the rating over the next 12 months if WEX's net debt to EBITDA sustains above 6.5x or if EBITDA coverage of interest falls below 2.5x. Separately, we could lower the rating if the company approaches its total leverage covenants, which is subject to step-downs. An upgrade is unlikely over the next 12 months. We could revise the outlook to stable if the company lowers its