The most evolved stocks: Sotheby's, Array BioPharma, PaySign

Discover the companies that make headlines Monday noon:

Sotheby 's – Sotheby' s share price jumped 57.2% after the announcement that European art collector Patrick Drahi was planning to acquire the auction house in the United States. art auction. Drahi will pay its shareholders $ 57 per share, or $ 3.7 billion in cash, to keep the company private. If approved, the deal will restore Sotheby's private ownership after 31 years as a publicly traded company.

Array BioPharma – Array Biopharma surged more than 50% after Pfizer announced the $ 10.64 billion acquisition of the drug company, or $ 48 per share. Array shares closed Friday at $ 29.59 action.

C & J Energy Services – C & J Energy Services jumped more than 17% after announcing its merger with oil services company Keane Group. Oil and energy services indicated that the combined company will have an enterprise value of approximately $ 1.8 billion. However, the law firm Halper Sadeh has announced that it is investigating the merits of the merger for the shareholders of C & J.

PaySign – PaySign shares fell more than 10% on Monday morning after the stock was downgraded to neutral by BTIG. The stock is up more than 200% this year. "We view this assessment as a fair reflection of the country's visible growth prospects," said BTIG. "We are moving away from the field until new growth leads appear (potentially via an acquisition) or that a downturn in its share price creates a better point of entry."

Ashford Hospitality Trust – The real estate company's shares retreated 4.4% after a DA Davidson analyst downgraded them to a neutral level. The analyst said that the recent 50 percent reduction in Ashford's dividend added to "the short-term uncertainty and industry hurdles" that society was facing.

Eventbrite – Shares of Eventbrite Ticketing Platform rose 7.7% after William Blair began hedging the stock with an outperformance rating. Blair believes that the stock has fallen too far, these levels being "an attractive entry point for long-term investors, given the duration of the company's above-average growth prospects".

Keurig Dr. Pepper – Shares of Keurig Dr Pepper Beverage Company rose 4.3% after BMO Capital Markets upgraded the stock to outperform market performance, citing attractive valuation relative to peers .

Mosaic – America's largest producer of potash and phosphate fertilizers has grown more than 4% after Bank of America upgraded it to make it neutral. The bank highlighted more constructive prospects for the company's operations in Brazil.

Disney – The giant entertainment's action fell 0.7%, an analyst at Imperial Capital downgraded its outperformance, pointing out that the 30% drop in the title this year has brought its valuation to a "record of multiples".

Symantec – Mizuho has upgraded Symantec to move from neutral and raised the stock price target to 23 USD, against 22 USD per share. The company said Symantec could "focus on optimizing its business" in the future. Symantec shares rose 2.6% to $ 19.85.

Corteva – Agricultural Chemicals' shares rose 4.7% following improvement in Deutsche Bank's position following several policy cuts by the company due to heavy rains in the Midwest rising trade tensions.

Dow Inc. – Dow has lost more than 3% after a BMO Capital Markets analyst degraded the chemical company to make it more efficient than ever before. The analyst said that this year "would prove more difficult as the problems of global trade persist".

-CNBC & # 39; s Jesse Pound, Elizabeth Myong, Mallika Mitra and Marc Rod contributed to this report.