Check out the companies making the headlines in midday trading: Micron Technology – Micron rose 2.7% after JPMorgan reiterated that the stock was bullish ahead of the memory maker’s earnings, which are expected on Wednesday after the market closes. Analyst Harlan Sur expects Micron’s results to be boosted by strong artificial intelligence and server demand. Tesla – Shares rose 4.8% after Barclays revised its equity weight on the electric car maker, saying Tesla’s third-quarter delivery numbers could come in better than expected and be a “near-term gain” for the stock. AeroVironment – The defense contractor is off more than 8% after the US Army issued a work stoppage order on a $990 million contract. Monday’s gain put the stock on track for its biggest advance since Aug. 28, where we increased by 9%. General Motors — The auto maker dropped 3% after Bernstein downgraded shares to market performance from an outperform rating, citing risks to earnings and possible price conditions from an inventory build-up. Ulta – The cosmetics stock lost more than 3% after it was downgraded to buy from TD Cowen. The investment firm said Ulta’s sales growth is slowing and that the stock’s valuation appears saturated. Biohaven – Shares rose 12% after the clinical-stage pharmaceutical company announced positive study data for a spinocerebellar ataxia treatment known as troriluzole. Studies have shown that troriluzole slows the progression of neurodegenerative disease in patients by 50% to 70%. Intel – Shares of the struggling manufacturer rose 2.4% after Bloomberg News reported Sunday that Apollo Global Management proposed to invest billions of dollars in Intel. CNBC also confirmed on Friday that Qualcomm recently contacted Intel about a takeover. Ciena – The telecommunications company’s stock jumped 4.6% after a double upgrade on Citi to buy from sell. Citi said the company is more likely to achieve its long-term goals of high growth. – CNBC’s Jesse Pound, Alex Harring, Samantha Subin and Sean Conlon contributed reporting.