CarMax (KMX) shares tanked 20% on Thursday after the Richmond-headquartered company recorded disappointing financials for its Q2, reflecting broader challenges of the used car market. The used vehicle retailer earned $0.64 a share in its fiscal second quarter, falling substantially short of$1.03 that analysts had forecast, while revenue also declined by 6% on a year-over-year basis. More News from Barchart Following today’s carnage, CarMax stock is down an alarming 50% versus its year-to-date high. ww ...