Check out the companies making headlines in midday trading: Chewy , GameStop — Chewy’s stock dropped about 6% after a regulatory filing showed meme stock trader Keith Gill, who is also known as “Roaring Kitty,” bought nine million shares, amounting to a 6.6% stake in the pet food e-commerce company. His other top holding, GameStop, also slid 6%. It is unclear if he sold shares of GameStop to buy Chewy. Boeing , Spirit AeroSystems — Boeing on Monday said it would buy back fuselage maker Spirit AeroSystems in a $4.7 billion all-stock deal. Shares of Boeing and Spirit AeroSystems rose more than 3% each. Trump Media & Technology Group — Shares of Trump Media & Technology Group rose 3% following a roughly 11% loss during Friday’s session. The stock is coming off a volatile session following the first presidential debate between President Joe Biden and former president Donald Trump ahead of the November election. Birkenstock — The shoe manufacturer advanced about 1% on the heels of a UBS upgrade to buy from neutral. UBS pointed to higher average sale prices and growth in the Asian market as reason for optimism. Nio — The Chinese electric vehicle stock rose 6% on Monday after the company said vehicle deliveries rose nearly 100% in June . Nio said it delivered 21,209 vehicles last month, up 98% year over year. Tesla — The electric vehicle stock popped 6%. Tesla is slated to report second-quarter delivery numbers this week. Floor & Decor Holdings — Shares of Floor & Decor dropped 3% after Spruce Point Capital Management published a short report , citing concerns about management and the board’s credibility. The report also revealed concerns about the company’s strategy and financial reporting accuracy. NextEra Energy Partners — The renewable energy stock dropped 5%. The Royal Bank of Canada downgraded NextEra Energy Partners to sector perform from outperform, citing a “challenging” road ahead for the company. Cruise stocks — A slate of cruise companies fell as Hurricane Beryl made landfall in Grenada as a Category 4 storm. Norwegian Cruise Line and Carnival slid more than 6%, while Royal Caribbean dropped 2.7%. — CNBC’s Jesse Pound, Michelle Fox, Alex Harring, Sarah Min and Hakyung Kim contributed reporting.