Feb 15 (Reuters) - Index provider MSCI said on Wednesday it will postpone implementation of updates to weightings for two of India's Adani Group companies, Adani Total Gas (ADAG.NS) and Adani Transmission (ADAI.NS), to the May benchmark review. The reversal of the updates to Adani Total Gas and Adani Transmission in the February index review will be reflected in the MSCI Index Product files starting from Feb. 16, MSCI said. MSCI will also apply a special treatment for all Adani Group's associated securities in the MSCI Equity Indexes starting from February. The new index weightings were due to come into effect on March 1 but the proposed changes to Adani Total Gas and Adani Transmission will be delayed until May. MSCI examined the size of companies' free floats, having determined there was "sufficient uncertainty" surrounding some investors in Adani companies.

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