If you are going to track stocks with Quickbooks (which is not recommended since generally purchase and holding of stocks is not a business but personsl set of transactions, then you trsck them as an asset whose purchase price includes all you paid to acquire the stocks, including transaction fees. This is your basis. When you sell you record the sales price against the asset value and then reduce this amount by selling fees. You remove the remaining asset value , + or - , to gain or loss.

The complicating factors are that rarely is the purchase or holding and sale of stocks considered part of any business. You might be a day trader but that day trading has no place in any other business. Itt is free standing personal investment,  most likely.

If uou use business money to purchase this is owner draw, if you usd personal funds but trzck in QB it is owner contribution. Correspondingly, sale proceeds may be owner draw or contribution.