Check out the companies making headlines after hours. Palantir Technologies – Shares rose 17% after Palantir posted a sales decline in the fourth quarter. According to LSEG, formerly known as Refinitiv, revenue came in at $608.4 million, compared to the $602.4 million analysts had forecast. The company posted adjusted earnings of 8 cents per share, which was in line with analyst expectations. CEO Alex Karp also highlighted the growth of the company's artificial intelligence platform. NXP Semiconductors — The chipmaker gained 3% after stronger-than-expected fourth-quarter results. NXP reported adjusted earnings of $3.71 per share, which was 8 cents higher than estimates from analysts surveyed by LSEG. The company's revenue of $3.42 billion also exceeded analyst expectations of $3.40 billion. Chegg – The stock fell 1% after first-quarter revenue guidance came in lighter than expected. Meanwhile, the company posted adjusted earnings per share in line with analyst expectations and a revenue increase in the fourth quarter, according to LSEG. Vertex Pharmaceuticals – Vertex shares were up 2.6% after rising in both the top and bottom lines in the fourth quarter. The company reported adjusted earnings of $4.20 per share, which exceeded analyst estimates of $4.10 earnings per share per LSEG. Revenue of $2.52 billion was slightly above consensus forecasts of $2.51 billion. Rambus – The chipmaker fell 7.9% after posting a year-over-year revenue decline in the fourth quarter. Revenue in the prior quarter was $122.2 million, compared to $122.4 million from the prior year. Simon Property Group – Shares rose almost 1% after the real estate investment trust issued strong full-year earnings guidance. Occupancy also increased 90 basis points year over year to 95.8% as of December 31, 2023. The company reported revenue in line with analyst estimates and increased the dividend to $1.95 from $1.90. Aecom — Shares of the infrastructure consultancy firm rose 2.6%. In the fiscal first quarter, the company posted adjusted earnings of $1.05 per share, ahead of consensus estimates of 95 cents per share, according to FactSet. Sales were lower than analysts had predicted. Aecom reported $1.71 billion, excluding items, while analysts had expected $1.74 billion. Cabot – Shares of the specialty chemicals company rose 1.2% after fiscal first-quarter earnings and revenue beat analysts' expectations. Cabot posted adjusted earnings per share of $1.56 on revenue of $958 million. Analysts estimate earnings per share at $1.50 and revenue at $953 million, per FactSet.