Alphabet, Facebook, DuPont and more

Discover the companies that make headlines Monday noon:

Alphabet, Facebook – Alphabet shares have lost more than 6% of news after the Justice Department was preparing an antitrust lawsuit against Google. According to some sources, the survey would examine the search practices of Google and other companies. Facebook shares also fell by 8%, while the technology sector in general was increasingly being watched by the government.

Amgen, Mirati Therapeutics – Shares of the biotechnology company Amgen surged 4.1% after the results of a cancer study on Amgen's gene therapy drug showed a significant reduction tumor size in patients with advanced lung cancer. The promising results also boosted Mirati's shares by 33.4%, as the biotech company is also developing a drug targeting the same gene mutation.

DuPont – DuPont shares jumped 9.4% after an analyst at Morgan Stanley initiated coverage of the overweight chemicals company. The analyst stated that he believes that DuPont has value, whether or not it becomes a "true multi-sector industry" or that its activities are separate.

Teva Pharmaceutical Industries – An analyst at Oppenheimer has upgraded Teva to outperform its performance, citing fundamentals improvement and its "online" execution by management. The stock increased by 3.2%.

Waste Management – Waste Management activities increased by more than 1% after an RBC Capital Markets analyst improved the stock's performance in order to outperform it. "We see in Waste Management a disproportionate growth in earnings, driven by sustained organic growth rates," said the analyst in a note.

Cypress Semiconductor – Cypress Semiconductor jumped more than 24% after learning that the German company Infineon would buy the chip maker for $ 23.85 per share. The sale values ​​Cypress at $ 10.06 billion. The Infineon stock price fell 9% on Monday to news.

Humana – Humana shares gained 1.2% after a SEC filings revealed that the company was not interested in the merger with health insurer Centene. This agreement would have been different from Centene's plans to acquire WellCare health plans. Centene's shares fell by more than 9%.

Nektar Therapeutics – The stock of biotechnology jumped nearly 10% after the company released positive test results for bempegaldes leukine, a drug designed to strengthen the immune system of a cancer patient.

Advanced Micro Devices – Advanced Micro Devices gained 1.2% after the chip maker announced a multi-year agreement with Samsung to license the use of intellectual property from its custom graphics to its mobile devices. Samsung will pay AMD's license fees and royalties.

Boeing – The shares of aircraft manufacturer Boeing have dropped more than 1% after the Federal Aviation Administration announced Sunday that more than 300 Boeing 737s could have defective parts. The FAA said it was forcing airlines to remove and replace all affected aircraft parts. The FAA said 148 pieces could be "susceptible to premature failure or cracks".

-CNBC & # 39; s Maggie Fitzgerald and Nadine El-Bawab contributed to this report.