Check out the companies making headlines in extended trading: Palantir — The defense technology stock advanced 4% after second-quarter earnings exceeded Wall Street’s expectations. Palantir said it reported adjusted earnings of 16 cents per share on $1 billion in revenue, while analysts polled by LSEG anticipated 14 cents in earnings per share and $940 million in revenue. Vertex Pharmaceuticals — The biotech stock sank 14% after second-quarter earnings topped estimates. Vertex posted adjusted earnings of $4.52 per share on revenue of $2.96 billion, while analysts surveyed by LSEG had penciled in $4.26 in earnings per share and $2.91 billion in revenue. Hims & Hers Health — Shares tumbled 12% after the telehealth company issued disappointing guidance. Hims sees third-quarter adjusted earnings before interest, taxes, depreciation and amortization ranging from $60 million to $70 million, while StreetAccount consensus estimates called for $77 million. Second-quarter results were mixed, with revenue missing expectations, while adjusted earnings narrowly beat. Syndax Pharmaceuticals — The biopharma stock slipped 3% after Syndax guided for a third-quarter research and development expense of between $95 million and $100 million, while analysts polled by FactSet had expected $65.8 million. However, the company posted second-quarter revenue that exceeded expectations, as well as a narrower-than-expected loss per share. Dorman Products — The vehicle parts supplier popped 7% after hiking its full-year earnings guidance to between $8.60 and $8.90 per share, excluding items, from a range of $7.55 to $7.85 a share. Dorman also issued better-than-expected top- and bottom-line results for the second quarter, per FactSet. V2X — Shares rose more than 2% after the aerospace and defense company’s second-quarter results beat Wall Street’s expectations. V2X posted adjusted earnings of 33 cents per share, while analysts polled by FactSet had penciled in 97 cents per share. The company’s revenue of $1.08 billion also beat the consensus estimate of $1.05 billion. Additionally, it raised its full-year earnings forecast. MercadoLibre — Shares dropped 4% after the Latin American e-commerce platform reported second-quarter earnings that missed expectations. MercadoLibre posted earnings of $10.31 per share, below the $11.93 per share estimated by analysts polled by FactSet. On the other hand, expected revenue of $6.79 billion topped the $6.67 billion consensus estimate. — CNBC’s Darla Mercado, Sean Conlon, Lisa Kailai Han and Sarah Min contributed reporting.