Stocks making the biggest moves premarket: Carnival, Chewy, KB Home, Lockheed Martin and more

Check out the companies making headlines before the bell: Carnival — The cruise line added nearly 3% ahead of its anticipated second-quarter financial report. Analysts are expecting earnings of 24 cents per share on revenue of $6.21 billion, according to FactSet. Airlines — Airlines rose following a drop in oil prices after President Trump called for a ceasefire in Iran and Israel. Frontier Group climbed 3%, United Airlines gained more than 2.5%, American Airlines Group advanced 2.1%, Delta Air Lines and JetBlue Airways rose 1.7%, Alaska Air added 1.4% and Southwest Airlines advanced 1%. Chewy — The pet-focused ecommerce retailer dropped 1.5% after a secondary sale of $1 billion in new Class A shares through JPMorgan. Chewy also authorized the repurchase $100 million of its stock. KB Home — The homebuilder dipped 1.1% after KB Home lowered its full-year revenue guidance. Los Angeles-based KB expects housing revenue between $6.3 billion and $6.5 billion, down from a previous $6.6 billion to $7.0 billion. KB Home's CEO said in an earnings release that the housing market has "softened." Defense stocks — Defense stocks fell after U.S. President Donald Trump said Tuesday a ceasefire in the Iran-Israel conflict is in effect. Shares of Lockheed Martin and RTX dipped more than 1% each. Oil — Oil stocks were little changed after Trump announced a ceasefire in effect between Israel and Iran. The VanEck Oil Services ETF eased 0.2% while Exxon Mobil retreated more than 1%. Visa , Mastercard — Visa and Mastercard rose more than 1% and 2%, respectively, after after Wells Fargo reiterated overweight ratings on both payments providers, saying investors should take advantage of of the recent pullback. First Financial Bancorp — Shares gained 1.7% after the Cincinnati-based bank agreed to buy Westfield Bancorp from Ohio Farmers Insurance Company for $325 million in cash and stock. Thor Industries — The owner of RV brands gained 1.7% after authorizing a $400 million buyback. Snowflake — The cloud-based online data storage company rose 2% after Morgan Stanley upgraded it to overweight from equal weight. The investment bank, which says Snowflake has more than 22% upside, is confident artificial intelligence growth will boost the stock. — CNBC's Michelle Fox, Alex Harring and Jesse Pound contributed reporting