high closing
n. The practice of artificially boosting a stock price by purchasing quantities of the stock a few minutes before the end of the year or quarter.

Example Citation:
"In some conversations, according to sources, RT Capital staff set specific price targets in purchase orders with brokerage traders to 'ramp up' stock values in an effort to boost the fund's performance returns at year end. The practice, known as 'high closing,' is prohibited by securities laws because it can artificially boost stock prices."
—Jacquie McNish and Andrew Willis, "Seized tapes show brokers flouting stock laws," The Globe and Mail, June 24, 2000

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