Box, Tyson Foods, Michaels, Navistar

Discover the companies that make the news in the midday:

Box – Box shares climbed more than 11% after the Starboard Value hedge fund announced it had taken a 7.5% stake in the software company. Starboard, which previously invested in Yahoo and Symantec, is now the third largest shareholder in Box. At one point in March, Box was trading around $ 24 a share, but the stock had fallen to about $ 13 a share last month.

Navistar – Navistar shares rose more than 11% after the truck builder announced earnings above expectations. The company posted earnings of $ 1.56 per share in the second quarter, exceeding the consensus estimate of $ 1.22. Navistar has also raised its forecast for truck deliveries throughout the year.

Tyson Foods – Tyson Foods shares fell 5.6% after the meat processor lowered its earnings guidance for 2019. The company cited a number of challenges, including a recent fire at one of its stores. slaughterhouses and the volatility of the commodity market.

Michaels Companies – The shares of the art and craft products retail company rose 7.4% after the company announced solid results for the second quarter. The company announced an adjusted earnings per share of 19 cents in the second quarter, or 5 cents more than the estimate. Same store sales also increased 0.3% from the estimated 1% decline. Mark Cosby, Acting CEO, spoke of the company's interest in sales and its customers.

Activision Blizzard – Shares of video game maker Activision Blizzard rose 4% after BMO revalued its stocks to outperform market performance and raised its price target from $ 43 to $ 60, an increase of about 17%. The company also raised its earnings guidance for next year on the basis of its belief that the company's restrictive plans and investments in exceptional games would improve financial performance.

Starbucks – Starbucks shares have fallen more than 1% after the coffee chain released lower-than-expected forecast for its fiscal year 2020 results. The company said it expects that earnings per share in fiscal year 2020 is lower than its "10% continuous growth model".

Tapestry – Shares of Tapestry rose 3.8% after the company announced that its chairman, Jide Zeitlin, would be named chairman and chief executive officer. Zeitlin replaces Victor Luis, who has been working at Tapestry for 13 years. The clothing company, which owns Coach and Kate Spade, has seen its price drop more than 30% since the beginning of the year.

– Jesse Pound, Elizabeth Myong and Maggie Fitzgerald of CNBC contributed to the report.