'Seriously underwater' mortgages are on the rise throughout the US, with Southern states seeing the biggest jump

• The percentage of "seriously underwater" mortgages rose in the first quarter. 
• In the US, 2.7% of homes carry a mortgage that's at least 25% more than the market value of the house. 
• That's according to ATTOM, which notes the South has seen a bigger jump in seriously underwater mortgages. 

The percentage of homes in the US that are worth significantly less than the mortgage they secure rose in the first quarter of 2024, according to data from ATTOM.