Computation of aggregate turnover

Yes, Non GST Supplies(i.e Non taxable Supply) is included in calculation of Aggregate turnover, but Share and Securities should not be added because it has to be "Supply" to be added in aggregate turnover. and as per the definition of Supply,..Supply included all goods and Services...

Shares and Securities are neither treated as Goods [ 2(52) ] nor Services [ 2(102) ] under GST Act.

So, it's excluded from Aggregate turnover.

09CQNPS2848P1ZO

Further, it's Noted that Non GST Supplies is also supply as per defination of Supply, but not Chargeable to tax under GST Act.
that is why Non GST Supply is included, but items which is 'neither Goods nor services' is excluded from Aggregate turnover.

Becoz other things are either supply or covered under definition of goods and services but not taxable but shares are securities and excluded from goods defination