SDT LN MKT-A on a credit report: finance company loan
SDT LN MKT-A is probably a loan from a finance company: on reports, "LN" usually stands for loan.
How to find out which company reported SDT LN MKT-A
Your free report at AnnualCreditReport.com shows the full name and address of whoever reported SDT LN MKT-A; our guide to identifying a creditor covers the other ways to find out.