In percentage terms, DII holding in NSE-listed companies went up to 5.01 per cent at the end of March 31, 2015, from the year-ago level of 4.58 per, on an aggregate basis.

However, DIIs holding was lower than FIIs stake, which stood at 6.44 per cent during the period under review.

In fact, DII ownership on a free-float basis or on the basis of non-promoter holdings in NSE firms, climbed to 11.46 per cent in the quarter ending March 2015 from 10.64 per cent one year back.

"Given the buoyant markets and good-quality portfolio, by value, the DII holdings in NSE-listed companies was at the highest level in six years at Rs 10.21 lakh crore, up by 50 per cent from a year back," the Prime Database report noted.

The increase was driven largely by the optimism about reform measures taken by Narendra Modi Government, according to market experts.

The analysis is based on shareholding patterns filed by 1,467 of the total 1,478 companies listed at NSE for the quarter ended March this year.

On an overall basis, DII holding shot up in 534 companies listed at NSE, with an average stock price return of these firm was 92 per cent. On the other hand, DII stake fallen in 480 companies listed at NSE, with an average return given by these firms, was 57 per cent.

In terms of firms, Balmer Lawrie & Co has the highest DII holding of 73.03 per cent, followed by Credit Analysis & Research (45.51 pc), 3I InfotechBSE -4.69 % (45.42 pc), GTL Infrastructure (38.16 pc) and Larsen & Toubro (36.09 pc).

Life Insurance Corporation of India (LIC), the biggest domestic institutional investors in the country, has invested in 307 companies having a valuation of Rs 3.89 lakh crore.

State-run LIC has the maximum holding in Corporation Bank (22.54 per cent) followed by MTNL (18.81 pc), Larsen & Toubro (16.73 pc), United Nilgiri Tea Estates (15.44 pc) and Orissa Minerals Development (15.42 pc).

Among the other top 10 DIIs by value of their holding are ICICI Prudential Life Insurance, General Insurance Crop, HDFC Standard Life Insurance and SBI Life.