Check out the companies making headlines in midday trading. Alphabet – Shares of the megacap technology name pulled back 1.2% after a federal judge ruled that Google has illegally monopolized online advertising technology , namely the markets for publisher ad servers and ad exchanges. Hertz — The rental car company surged 50% to a 52-week high, following a 56% rally in the previous session, after Bill Ackman’s Pershing Square took a sizable stake . A regulatory filing revealed Pershing Square had built a 4.1% position as of the end of 2024. Pershing has significantly increased the position — to 19.8% — through shares and swaps, becoming Hertz’s second-largest shareholder, CNBC reported. Nvidia , Advanced Micro Devices — Shares of Nvidia dipped nearly 3% and AMD declined 1%, continuing their declines from the previous session when the chipmakers announced additional charges tied to China exports due to President Donald Trump’s tariff plans. Global Payments , Fidelity National Information Services — Global Payments announced it is acquiring Worldpay for $24.25 billion from Fidelity National Information Services and a private equity firm, and divesting its Issuer Solutions business. Shares of Global Payments fell 16%, while Fidelity National Information Services jumped 8.6%. Taiwan Semiconductor — U.S. shares jumped more than 1% after the chipmaker’s results for the first quarter topped Wall Street’s expectations. The company also maintained its 2025 revenue forecast, noting that it has not yet seen any changes in customer behavior despite there being “uncertainties and risks from the potential impact of tariff policies.” UnitedHealth — Shares of the insurer plummeted about 22% on the back of disappointing first-quarter results. UnitedHealth reported adjusted earnings of $7.20 per share on revenue of $109.58 billion, falling short of the $7.29 in earnings per share and $111.60 billion that analysts surveyed by LSEG called for. The company also slashed its full-year guidance . Eli Lilly — The pharmaceutical stock jumped 16% after Eli Lilly said its daily obesity pill showed positive results in its late-stage trials. Weight loss data, along with rates of side effects and treatment discontinuations, from the experimental pill — called orforglipron — came out in line with what some Wall Street analysts were expecting. The pill fell short of some analysts’ estimates for a key diabetes metric. Alcoa — The stock shed nearly 5% after Alcoa, one of the world’s largest aluminum producers, reported first-quarter revenue of $3.37 billion, which fell short of the forecasted $3.53 billion from analysts polled by LSEG. Alcoa’s earnings came out better than expected. D.R. Horton — The homebuilding stock gained 3%, despite posting weaker-than-expected second-quarter results. D.R. Horton reported earnings of $2.58 per share, while analysts had expected earnings of $2.63 per share, according to LSEG. The company’s revenue of $7.73 billion came out below the consensus $8.03 billion estimate. — CNBC’s Sean Conlon and Yun Li contributed reporting.