NEW YORK ( TheStreet) -- Today's buy-and-trade earnings preview covers five companies from the finance sector, two from the medical sector, and one each in the computer and technology, construction, retail-wholesale, transportation and utilities sectors.The ValuEngine valuation warning continues with 77.5% of all stocks being overvalued, 43.1 by 20% or more. 15 of 16 sectors are overvalued 13 by double-digit percentages, nine by more than 21%. The finance sector is 19.5% overvalued with an equal-weight rating. 80.9% of the 3061 stocks in this sector have hold ratings. The medical sector is 21.3% overvalued with an equal-weight rating. 58.5% of the 791 stocks in this sector have hold ratings. The computer and technology sector is 24.8% overvalued with an overweight rating. Of the 1160 stocks in this sector 47.5% have buy or strong buy ratings. The construction sector is 14.7% overvalued with an underweight rating. Of the 160 stocks in this sector 56.3% have sell or strong sell ratings. The retail-wholesale sector is 25.9% overvalued with an overweight rating. Of the 351 stocks in this sector 80.3% have buy or strong buy ratings.