One of the most important subjects of DEA area is efficiency analysis and classification of firms. It is\nimportant that stock holders know all information about stocks. Efficiency of stock market plays a\nsignificant role in transfer of invests The most important goal of the present paper is to evaluate the\nefficiency of automotive and parts manufacturing branch in Tehran Stock Exchange (TSE), to select a\ngroup of desirable securities from a list of 31. We applied data envelopment analysis for ranking and\nevaluating the units. First, the efficiency of units presented in three different types: technical, management\nand scale efficiency, and inefficient units were identified. So, peer groups, their weights and grade of units\nintroduced. Finally, optimal amounts of inputs calculated for some of inefficient units. The Results show\nthat the units (7, 8, 14, 18, 19, 20, 21, 23, 24, 25 and 29) are known as superior units. Unit 7 obtained the\nfirst rank of 29 units because this DMU get the efficient rank in three types and was introduced 5 as the\npeer unit for the others so called the stronger unit. 19 of the firms are classified in efficient scale.The units\n3,10, 11, 13, 16 & 17 have surplus inputs, it means that these units have used more inputs rather than the\nother units which are in the same level and suggested reduce the surplus amount for achieving the same\nefficiency.
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