Check out the companies making headlines in midday trading. Berkshire Hathaway — Warren Buffett's conglomerate saw shares drop more than 4%, retreating from record highs reached on Friday. Monday's sell-off came after the 94-year-old Buffett announced his intention to step down as CEO. The board voted unanimously on Sunday to make Greg Abel president and CEO on Jan. 1, 2026 and for Buffett to remain as chairman. Meanwhile, Berkshire's operating earnings fell 14% in the first quarter , driven by a 48.6% plunge in insurance-underwriting profit. On Semiconductor — Shares tumbled more than 8% despite the chipmaker's top- and bottom-line beat in the first quarter. On also issued second-quarter guidance, estimating adjusted earnings coming in between 48 cents and 58 cents per share, while analysts polled by FactSet forecasted 51 cents per share. Top-line guidance between $1.4 billion and $1.5 billion also mostly came above consensus estimates for $1.41 billion. Skechers USA – Shares of the footwear company surged nearly 25% after it agreed to be acquired by 3G Capital for $63 per share . Other footwear stocks rose in sympathy following the announcement. Crocs gained almost 5%, while Deckers advanced more than 2%. Tyson Foods — Shares of the Jimmy Dean and Hillshire Farm parent slipped almost 8% after revenue for the second fiscal quarter came in at $13.07 billion, missing the consensus forecast of $13.14 billion from analysts polled by FactSet. However, Tyson posted earnings of 92 cents per share, excluding items, beating the Wall Street estimate of 83 cents a share. Howard Hughes — The stock added 3.7% after activist investor Bill Ackman's Pershing Square agreed to buy 9 million newly issued shares of the real estate developer. The hedge fund is paying $100 per share, which represents a 48% premium to Howard Hughes' closing price on Friday. Sunoco — Shares fell nearly 6% after the motor fuel distributor shared its plan to acquire Parkland, a Canada-based competitor. The cash-and-stock deal is valued at more than $9 billion, which includes debt. Loews — Shares of the conglomerate pulled back 1.3% after the company's first-quarter report showed a drop in earnings. Loews reported $370 million in net income for the period, or $1.74 per share, down from $457 million and $2.05 per share a year earlier. The company saw net income declines in its insurance and hotel businesses. Streamers — Streaming stocks declined after President Donald Trump announced in a Sunday Truth Social post a 100% tariff on movies produced outside of the U.S. to save the "dying" American movie industry. Netflix lost more than 1%. Amazon , Paramount Global and Warner Bros. Discovery each shed roughly 1%. EQT — The natural gas stock popped almost 3% following UBS's upgrade to buy from neutral. UBS called the stock "well positioned" to capture upside tied to the firm's positive outlook for natural gas next year. Wendy's — The fast-food chain added 1% on the back of JPMorgan's upgrade to overweight from neutral. JPMorgan said the stock's current share price offers a "value-oriented opportunity" for investors. Sotera Health — Shares jumped nearly 5% after Goldman Sachs upgraded the testing lab company's stock to buy from neutral. Goldman said the company has a "durable" business model and should be able to withstand an economic downturn. — CNBC's Sean Conlon, Lisa Kailai Han, Hakyung Kim, Michelle Fox, Jesse Pound and Yun Li contributed reporting