The Street Beat

Analysts expect Google to deliver solid financial results in the recently ended quarter, with revenue up more than 30 percent year-on-year at $7.21 billion. But the darkening economic picture is raising concerns that advertisers could pull back on spending in the months ahead, cutting into revenue and profit margins at Google, which derived 96 percent of its revenue last year from advertising.

Internet search giant Google has reached a deal to buy Motorola Mobility for $40 a share, or about $12.5 billion.

Google shares were tumbling 2.5% to $549.50 and Motorola Mobility shares were surging 60.2% to $39.21 in premarket trading Monday.