Forward-looking indicators also saw big year-over-year increases. Total active listings were up 9.9 percent, and single-family pending sales were up 16.7 percent. Single-family inventory increased to 3.8 months in March, up from a 3.5-month supply both the previous month and a year earlier. Months of inventory estimates the number of months it would take to sell all the home listings on the market today based on the pace of sales over the past 12 months. Nationwide, inventory stands at a 3.8-month supply.