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Among U.S. stocks making big moves:

• Leucadia National announced it would buy the investment banking firm Jefferies Group. The Jefferies chief will run the combined company. Leucadia, a holding company with investments in an eclectic set of industries including beef processing and medical products, dropped nearly 5 percent, $1.01, to $20.79. Jefferies soared 12 percent, or $1.71, to $15.98.

• Sherwin-Williams, the paint company, jumped 7 percent after announcing it will buy Consorcio Comex, a privately held rival based in Mexico City. Its stock rose $9.86 to $150.70.

• Best Buy leapt after announcing it had named a new finance chief, a former executive of the upscale kitchen store Williams-Sonoma. Analysts hope the new numbers cruncher can help turn around a chain that has struggled to keep up with online competitors. Best Buy’s stock rose 4 percent, or 68 cents, to $15.98.