Check out the companies making headlines in midday trading: American Airlines — Shares fell 2.5% after an American Airlines regional jet collided with an Army helicopter in Washington, D.C., marking the first fatal commercial airline crash on U.S. soil since 2009. Nvidia — Shares pulled back more than 3% as the chipmaker remained under selling pressure. Nvidia has slipped more than 16% so far this week. United Parcel Service — The shipping firm plummeted 16% and was on pace for its worst day ever. UPS on Thursday said the company reached an agreement with Amazon “to lower its volume by more than 50% by the second half of 2026.” Amazon is UPS’ largest customer. Las Vegas Sands — The casino stock gained more than 10% on the heels of better-than-expected revenue in the fourth quarter. Las Vegas Sands reported revenue of $2.9 billion, while analysts polled by LSEG forecast $2.87 billion. ServiceNow — The software company pulled back more than 12% on weak first-quarter revenue guidance. ServiceNow sees revenue between $2.995 billion and $3 billion, slightly below a FactSet consensus estimate of $3.03 billion. The company’s full-year forecast was also below expectations. International Business Machines — The legacy technology company gained 12% on better-than-expected fourth-quarter results. IBM reported earnings per share of $3.92, excluding items, while analysts polled by StreetAccount were looking for a profit of $3.78 per share. Revenue came in at $17.55 billion, which was roughly in line with expectations. Caterpillar — The industrial equipment manufacturer dropped 4.8% after missing fourth-quarter revenue expectations. The company reported $16.22 billion, while analysts surveyed by LSEG anticipated $16.39 billion. On the other hand, Caterpillar earned $5.14 per share, excluding items, surpassing the Wall Street forecast of $5.02 a share. Teradyne — The automatic test equipment stock dipped 6.5% despite mixed guidance. The low end of Teradyne’s first-quarter revenue forecast was below the forecast average of $693.5 million from analysts surveyed by FactSet. Teradyne sees current-quarter revenue in the range of $660 million to $700 million. Comcast — Shares of the telecommunications giant fell 12% after reporting a net loss of 139,000 residential broadband subscribers for the fourth quarter. That was worse than the company projected in December. The stock fell to its lowest level since 2022. Cigna — The health-care stock fell 8% after fourth-quarter results missed estimates. Cigna reported adjusted earnings of $6.64 per share, while analysts surveyed by LSEG forecast $7.82 per share. The company’s revenue of $65.65 billion was above expectations of $63.36 billion, however. Dow — Shares slipped 6%. Dow reported fourth-quarter operating earnings and revenue that was below analysts’ estimates, and guided to softer-than-expected first-quarter revenue. Operating earnings were about flat with revenue of $10.41 billion in the most recent quarter. Analysts polled by FactSet forecast Dow would notch 24 cents per share on revenue of $10.51 billion. For the current quarter, Dow expects revenue of $10.3 billion, below the $10.9 billion FactSet estimate. Northrop Grumman — Shares of the defense company slipped 2% after Northrop missed fourth-quarter sales expectations. The company reported $10.69 billion in revenue for the period, while analysts polled by FactSet called for $10.97 billion. Northrop’s earnings came out at $6.39 a share, excluding items, however, beating the consensus FactSet estimate of $6.35. Northrop’s CEO said the guidance reflects continued top-line growth, margin expansion and double-digit cash flow growth. Microsoft — The tech giant dipped about 6%, on pace for its worst day since Oct. 31, on the back of disappointing revenue guidance . Microsoft sees fiscal third-quarter revenue coming in between $67.7 billion and $68.7 billion. Analysts polled by LSEG expected guidance around $69.78 billion. — CNBC’s Pia Singh, Jesse Pound, Hakyung Kim and Alex Harring contributed reporting. Disclosure: Comcast owns NBCUniversal, the parent company of CNBC.