Indices closed with gains on Thursday, June 20, 2019. The S&P 500 traded up to an all-time record high. Technology and energy brands bolstered the ascent. On another note, Slack Technologies debuted on the New York Stock Exchange today. The work-software giant opened with a $38.50 trade, nearly 50% above its suggested price of $26. Shares ended the session at $38.70. On another note, crude oil prices rose. West Texas Intermediate crude tacked on 5.89% to settle at $57.15 a barrel.