Crude oil prices rebounded to lift the markets to a higher open with the Dow soaring 102 points to 18,271. Nasdaq climbed 30 points to 5,320.

On the upside

Piper Jaffray upgraded Catalyst Pharmaceuticals (Nasdaq: CPRX) from a Neutral rating to an Overweight rating.

Inventergy Global (Nasdaq: INVT) updated investors on recent debt amendments and a letter of intent with Fortress Investment Group.

Resolute Energy (NYSE: REN) entered an agreement to acquire certain oil and gas properties in Reeves County, Texas for $135 million from Firewheel Energy.

On the downside

Immunomedics (Nasdaq: IMMU) priced its offering of 10 million common shares and warrants at the discounted price of $3 per unit.

Shares of Salesforce.com (NYSE: CRM) fell on news that the company will make an offer for Twitter (NYSE: TWTR).

Profit taking weighed down shares of Renren (NYSE: RENN).

In the broad market, advancing issues outpaced decliners by a margin of nearly 3 to 1 on the NYSE and by more than 5 to 2 on Nasdaq. The broader S&P 500 gained 8 points to 2,158. Bitcoin rose $4 to $610.