Going long intraday is allowed but with full margins (CNC). I had tested this today -
But, as Siva mentioned, intraday product types (MIS, CO) aren’t available on listing day. I had tested that in this thread.
Also, going short even with full margins (CNC) on the listing day isn’t possible unless you were likely allotted the shares via IPO. I had tested doing that on IndigoPaints listing day and got the following error -
