Midday Leaders and Laggards: Nasdaq 100

The index, which includes 100 of the largest nonfinancial securities listed on the Nasdaq Stock Market, lost 2.23 points to 1,982.53 in midday trading. The broader Nasdaq composite fell 5.42 points to 2,469.36.

Light, sweet crude for July delivery gained 22 cents to $134.83 a barrel on the New York Mercantile Exchange, after oscillating earlier in the session.

Shares of Cadence Design Systems Inc. lost 68 cents, or 5.9 percent, to $10.90. The company said Tuesday it offered $16 a share, or about $1.45 billion, for smaller rival Mentor Graphics Corp.

Shares of information technology company Citrix Systems Inc. shed $1.74, or 5.2 percent, to $31.86 after the company's head of sales resigned, leading a Friedman, Billings, Ramsey & Co. analyst to cut his rating.

Shares of Hansen Natural Corp., which makes Monster drinks, slipped $1.80, or 4.8 percent, to $35.93.

On the gaining side, shares of wireless communications company Leap Wireless International Inc. rose $1.67, or 3.3 percent, to $53.35.

Amazon.com Inc. shares increased $1.89, or 2.3 percent, to $83.59.

Shares of VeriSign Inc., which runs many of the Internet's core systems, jumped 79 cents, or 2 percent, to $40.55. An Oppenheimer & Co. boosted his price target on the company late Monday.