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When shares held are 'capital asset' ( not stock-in-trade) the income on transfer will fall u/h 'capital gains'. Furthermore when transactions are few and not voluminous, and in past admittedly activity is considered as investment activity, and gains on transfer are assessed as capital gains, then there is no question of treating income on transfer of shares, held as investment, as business income.
You may refer to judgment of Bombay HC in case of Gopal Purohit, Calcutta HC in case of Bhagawati Pd. Agarwal, and a recent judgment of Gujrat HC in which it has been held that even if investment is made out of borrowed funds, gains will be capital gains when shares transferred are capital asset of assessee.
You may also refer to some of my articles on this website to make out case by raising various contentions.