The markets closed higher with the Dow gaining 66 points to 21,640 after the United States, Canada and Mexico agreed to an aggressive calendar to renegotiate NAFTA. Nasdaq climbed 40 points to 6,385.

On the upside

Select Energy Services (NYSE: WTTR) will acquire Rockwater Energy Solutions in an all-stock transaction valued at over $470 million.

Laredo Petroleum (NYSE: LPI) will sell its interest in Medallion Gathering & Processing.

JinkoSolar (NYSE: JKS) entered a non-binding agreement with Greatcell Solar to jointly develop third generation photovoltaic technology.

On the downside

United Continental (NYSE: UAL) reported higher second quarter earnings and revenue but the airliner forecast disappointing passenger revenue per available seat mile for the current quarter.

Inovio Pharmaceuticals (Nasdaq: INO) will offer $75 million shares of common stock through a public offering.

Second quarter earnings and revenue for Northern Trust (Nasdaq: NTRS) fell short of expectations.

In the broad market, advancing issues outpaced decliners by a margin of more than 5 to 2 on the NYSE and by nearly 7 to 3 on Nasdaq. The broader S&P 500 climbed 13 points to 2,473. Bitcoin plunged $51 to $2258.