After-hours buzz: Baidu, Square, Intuit & more

Check out the companies making headlines after the bell Monday:

Shares of Baidu tumbled after the Chinese internet search provider slashed revenue projections for the second fiscal quarter amid regulatory pressures. The company expects revenue of between $2.81 billion and $2.82 billion in the second quarter, compared to the previously stated range of between $3.12 billion and $3.19 billion, as authorities review the firm's online marketing practices regarding healthcare, a company statement said.

Square shares popped while Intuit shares dipped after a big day in technology news. Microsoft and LinkedIn announced a merger, a move that is likely to impact Square and Intuit's small business customers. Meanwhile, Apple announce peer-to-peer iMessage payments via Square Cash. Square competes with Intuit's payment division.

New York Stock Exchange (NYSE) and Wall Street at night
David Howells | Corbis | Getty Images
New York Stock Exchange (NYSE) and Wall Street at night

Walgreens Boots Alliance edged lower in light trading, paring some of the day's gains after it terminated its relationship with embattled blood-testing start-up Theranos. Walgreens had said Sunday that it will immediately close all 40 Theranos Wellness Centers at the drugstore chain's Arizona locations, according to the Associated Press.

Zimmer Biomet's stock fell after the healthcare company announced a secondary offering of 11 million shares. Stockholders KKR, Goldman Sachs and TPG are among those offering shares of the company, which specializes in musculoskeletal products. Other healthcare stocks like Stericycle and Mylan also sank, while Universal Health Services and Quest Diagnostics shares rose.

Tractor Supply shares edged lower in extended trading, even though an analyst initiated coverage with a '"buy" writing. Tractor Supply, a lifestyle company for recreational farmers and ranchers, dominates the need for a specific group of customers, creating customer loyalty, Guggenheim Securities wrote in a research note. The analysts put a $110 price target on the stock, while the stock closed at $91.27.

— The Associated Press contributed to this report.