Stocks making the biggest moves after hours: Super Micro Computer, CoreWeave, H&R Block and more

Check out the companies making headlines after hours. Super Micro Computer — The data center infrastructure stock rallied more than 8% after Super Micro Computer issued rosy guidance for first quarter earnings and revenue, in addition to exceeding fourth quarter estimates. The company expects adjusted earnings in the range of $1.01 to $1.10 per share, far above the LSEG consensus estimate of 76 cents. Revenue guidance in the range of $14.5 billion to $15.5 billion also topped the anticipated $11.68 billion. CoreWeave — The artificial intelligence cloud company saw shares gain 14%. Second quarter adjusted operating income margin came in at 5% compared to the StreetAccount consensus estimate of 2.7%. Revenue of $2.58 billion was up 112% from the year-ago period, and it came in ahead of the $2.56 billion expected, per the LSEG consensus estimate. Lumentum Holdings — Shares were marginally lower even after the maker of optical and photonic products posted fourth quarter adjusted earnings and revenue that exceeded expectations. The AI beneficiary has tumbled more than 22% over the last three months. However, it's had a blockbuster year thus far, up more than 120% year to date. H & R Block — Shares surged 15% after H & R Block issued an upbeat forecast for the 2027 fiscal year. The company sees adjusted earnings in a range of $6.04 to $6.24 per share on revenue of $4.11 billion to $4.16 billion. That compares to the LSEG consensus estimate of $5.86 per share and $4.05 billion. Cava Group — Shares of the Mediterranean fast-casual restaurant chain jumped almost 7% after reporting second quarter earnings of 19 cents per share, topping the LSEG consensus estimate of 18 cents a share. Revenue of $368.4 million topped the anticipated $361 million. — CNBC's Darla Mercado contributed to this report.