I think a large buy order at market about 5 seconds before close might work to offset the daily GSCO dump. However, Goldman has their own clearing , GSCO, and they can instantaneously execute their orders. Retail orders take much longer to execute. Just watch level 2 at closing. We are up now. GSCO will dump right at closing to wipe out gains. Or they might do nothing. Their pattern has been to dump at the last second.