to make a claim as a trader, you must be carrying on a business as a share trader....
if you carry on a business, your shares are trading stock and your income is "ordinary income" or "revenue"...therefore you can offset any losses or related deductions against your other "ordinary income" such as salary & wages...
if you are not a trader (investor, novice, gambler or speculator), your shares are CGT assets. As such, so deductions are available to you (except interest on borrowings) because the "cost base" rules in section 110-25 of the ITAA 1997 do not allow this...
