U pitanju je relativno nov izraz koji označava jedan od (starih) oblika manipulacije na berzi - ispostavljanje naloga kupovine ili naloga prodaje neposredno pre zatvaranja tržišta u cilju manipulacije cenom na zatvaranju, odnosno preovlađujućom cenom.
Shodno tome, predlažem da ga ostavite u originalu, pod navodnicima (ili da originalni termin navedete bar u zagradi ili fusnoti)


http://www.cftc.gov/consumerprotection/educationcenter/cftcg...
Banging the Close: A manipulative or disruptive trading practice whereby a trader buys or sells a large number of futures contracts during the closing period of a futures contract (that is, the period during which the futures settlement price is determined) in order to benefit an even larger position in an option, swap, or other derivative that is cash settled based on the futures settlement price on that day.

http://www.professionaltradermentoring.com/flash-crashes/
“Banging the close” is another new term meant to describe when a trader puts orders into the market at the very end of the trading day with the intention of pushing the market one way or another. The trader’s purpose in “banging the close” is to make his position look better than it would have looked otherwise. The term “banging the close” may be new, but trying to push the market in a favorable direction at the end of the day predates all of us.