I started doing dividend re-investment and as my spouse's brokerage account was at a different brokerage, so I noticed the different price for same ETF e.g. QQQ.
One of the brokerage gave reinvestment price at $338.87 and the other one gave $339.58804 per share.
It seems minute difference, but want to know what should be the crystal clear price as I guess these new shares might be issued by the issuer, so all brokerage should give same price. Is there any rule?