Check out the companies making headlines after the bell : Palantir Technologies — Shares of Palantir Technologies popped more than 15% after the company beat second-quarter estimates and upped its annual forecast as demand for artificial intelligence software shows no signs of dwindling. Palantir posted adjusted earnings of 9 cents per share on $678 million in revenue. Lucid Group — Shares surged 6% after second-quarter results surpassed top-line estimates. The electric vehicle company reported revenue of $200.6 million , while analysts polled by LSEG forecast $192 million. Executives also reaffirmed prior guidance that called for vehicle production of roughly 9,000 in 2024. CSX Corp. — The rail transportation holding company advanced roughly 3% in extended trading following stronger-than-expected earnings. CSX notched earnings of 49 cents per share in the second quarter, while analysts polled by LSEG expected 48 cents. Revenue of $3.70 billion was in line with Street’s estimates. Semiconductor stocks — Some semiconductor and AI stocks that declined during Monday’s session bounced in after-hours trading, with Nvidia and Super Micro Computer last up more than 1% each. Broadcom , Arm Holdings and Intel also added about 1% each. Spirit AeroSystems — Shares of the Boeing fuselage supplier declined nearly 2%. Spirit AeroSystems posted a wider-than-expected loss of $2.73 per share and $1.49 billion in revenue. Analysts surveyed by LSEG had expected a loss of 90 cents and $1.59 billion in revenue. Hims & Hers Health — Hims & Hers Health slumped 3% even after the digital pharmacy company topped Wall Street’s second-quarter estimates and lifted its full-year revenue guidance. Avis Budget Group — Shares declined 3% on weak results in the second quarter. The car rental company reported revenue of $3.05 billion, while analysts surveyed by LSEG called for $3.14 billion. Earnings also missed expectations. ZoomInfo Technologies — The software stock fell 13% after ZoomInfo posted disappointing second quarter results , as well as poor third-quarter guidance. The company, known for its search engine product for contacts and business information, posted adjusted earnings of 17 cents per share, below the earnings of 23 cents per share anticipated by analysts polled by LSEG. Revenue of $291.5 million was below the consensus estimate for $307.7 million. Simon Property Group — Shares of the mall owner dipped about 1%. Simon Property topped second-quarter revenue estimates, but posted in-line earnings. The company also upped its dividend by 15 cents. — CNBC’s Brian Evans and Sarah Min contributed reporting