Check out the companies making headlines after the bell : International Business Machines — The technology giant slipped 6% after IBM failed to raise its full-year guidance after posting an earnings beat. IBM reported first-quarter earnings of $1.91 per share, excluding items, beating forecasts of $1.81, according to LSEG. The company’s $15.92 billion in revenue also came in above the expected $15.62 billion. Tesla — Shares fell more than 2% after CEO Elon Musk warned of substantial increases in capital spending to fund its self-driving and humanoid robot ambitions. Shares had climbed as much as 4% just after the electric vehicle maker posted first-quarter adjusted earnings of 41 cents per share, beating the 37 cents analysts polled by LSEG had expected. However, Tesla’s $22.39 billion in revenue came in below the $22.64 billion consensus estimate. CSX — The transportation stock popped 6% after posting first-quarter earnings of 43 cents per share, beating the expected 39 cents analysts surveyed by FactSet had penciled in. However, CSX’s $3.48 billion revenue came in slightly below the forecast $3.49 billion. Texas Instruments — The semiconductor stock soared 10% after it forecast that its current-quarter earnings would come in the range of $1.77 to $2.05 per share, versus the $1.57 consensus, according to LSEG. Similarly, it sees its revenue coming in between $5 billion to $5.4 billion, while analysts were anticipating $4.86 billion. Texas Instruments also posted a beat on both the top and bottom lines for its first quarter. Southwest Airlines — Shares fell 3% after the airline carrier posted first-quarter adjusted earnings of 45 cents per share and revenue of $7.20 billion, falling short of the 47 cents and $7.27 billion in revenue analysts were expecting, per FactSet. Lam Research — The global chip toolmaker added 2% after posting fiscal third-quarter adjusted earnings of $1.47 per share and revenue of $5.84 billion, beating the $1.36 and $5.78 billion analysts had forecast, respectively, according to LSEG. Lam Research’s earnings and revenue guidance for its current quarter were also above analyst estimates. ServiceNow — The AI-powered software company reported first-quarter earnings and revenue that topped Wall Street expectations. However, shares tumbled more than 13% as the integration of recently acquired Armis weighed on its outlook. For the full year 2026, the company’s subscription revenue should grow more than 22% to a range of $15.74 billion to $15.78 billion, including the Armis cybersecurity business. Previously, the company expected subscription revenue of $15.55 billion. Molina Healthcare — Shares of the managed healthcare company rose slightly after it reaffirmed its 2026 forecast. Molina earned $2.35 per share, excluding items, in the first quarter on revenue of $10.8 billion. Analysts surveyed by FactSet anticipated Molina would earn $1.90 per share on revenue of $10.87 billion. United Rentals — Shares jumped more than 15% after the equipment rental company boosted its full-year sales forecast to a range of $16.9 billion to $17.4 billion. The company said it sees momentum heading into its busiest season. Churchill Downs — The racetrack owner added 2% after posting first-quarter adjusted earnings of $1.21 per share and revenue of $663 million. Analysts polled by FactSet had expected $1.01 and $661.2 million. Knight-Swift Transportation — The transport stock shed nearly 3% after reporting first-quarter revenue of $1.85 billion, coming in below the $1.86 billion analysts were expecting, per FactSet. Operating income for the firm’s last quarter came in at $49.8 million, while consensus estimates had called for $87 million. — CNBC’s Christina Cheddar Berk contributed reporting.