...Our rating on WEX reflects the company's strong operating performance and large portfolio of high-quality securities, balanced by high gross debt. WEX's performance has sharply rebounded since COVID-19-related lows in 2020. For the rolling 12 months ended June 30, 2023, WEX's S&P Global Ratings-adjusted EBITDA was $1.24 billion--up $344 million, or 38% year-over-year. Balancing our view of WEX's strong performance is the large increase in deposit-based funding on the company's balance sheet. We include WEX's on-balance-sheet deposits--used to fund its fleet receivables and growing investment portfolio--in our gross debt calculation. We think WEX's growing investment portfolio may help offset interest rate risk associated with the company's debt. While WEX's short-term deposit liabilities grew by about $1.0 billion through the first six months of 2023, the bulk of this growth came from an increase in health savings account (HSA) deposits, which have a weighted average cost of just 11 basis...