Shares of

Sirf Technology

( SIRF) were among the

Nasdaq's

winners Wednesday, rising 8% after the company was chosen by

Garmin

(GRMN) - Get Report

to supply chips for a host of new Garmin products.

"Sirf's high sensitivity architecture is well-suited for some of our soon-to-be-announced products," Garmin said, "and will help us achieve our mission of enhancing the GPS experience." The agreement calls for Garmin to use Sirf's Sirfstar III architecture on selected Garmin products. Shares were trading up $1.74 to $23.93.

Tiffany

(TIF) - Get Report

rose 12% after the jeweler posted second-quarter results that topped forecasts. The company earned $50.6 million, or 35 cents a share, on sales of $526.7 million. Earnings in the most recent quarter were helped by a lower tax rate, which lifted earnings by 5 cents a share. Analysts polled by Thomson First Call were expecting earnings of 24 cents a share on sales of $519.6 million. A year ago the company earned $33.1 million, or 22 cents a share, on sales of $476.6 million.

Looking ahead, Tiffany now expects full-year earnings of $1.55 to $1.65 a share, up from previous guidance of $1.45 to $1.55 a share. Sales, meanwhile, are expected to grow by 8% to 10%. Analysts are expecting earnings of $1.51 on sales of $2.41 billion. Shares were trading up $4 to $37.31.

Shares of

United Natural Foods

(UNFI) - Get Report

rose 8% after the company reported fourth-quarter results that were better than expected. The company posted earnings of $11.8 million, or 28 cents a share, on sales of $543 million. Excluding a small gain, the company would have earned $11.6 million, or 28 cents a share. Analysts were expecting earnings of 26 cents a share on sales of $528.2 million. A year ago, the company earned $9.6 million, or 23 cents a share, on sales of $446.4 million. Shares were trading up $2.59 to $33.70.

Transocean

(RIG) - Get Report

rose 2% after the company won multiyear contracts that could be worth as much as $700 million. The contracts, awarded by a consortium consisting of

Statoil

(STO)

,

Eni

(E) - Get Report

,

Norsk Hydro

( NHY) and

Shell

(RDS.A)

, call for the use of Transocean's high-specification semisubmersible rigs Transocean Arctic and Polar Pioneer. The Transocean Artic rig received an estimated 50-month contract with a potential worth of about $395 million. The Polar Pioneer received a 36-month award that could be worth as much as $306 million. The Transocean Arctic contract is expected to begin during the third quarter of 2006 while the Polar Pioneer contract is expected to begin in April 2006. Shares were trading up $1.22 to $58.76.

Shares of

Semtech

(SMTC) - Get Report

fell 2% after the company posted in-line second-quarter earnings but warned that third-quarter earnings would fall short of expectations. The company earned $7.4 million, or 10 cents a share, on sales of $58 million. Excluding items, the company would have earned 14 cents a share. Analysts were expecting earnings of 14 cents a share on sales of $57 million. A year ago, the company earned $17.4 million, or 22 cents a share, on sales of $68.3 million.

Looking ahead, Semtech forecast pro forma third-quarter earnings of 14 cents a share on sales of about $60 million. Analysts had been expecting earnings of 16 cents a share on sales of $60.7 million. Shares were trading down 42 cents to $16.58.

NYSE

volume leaders included

Motorola

( MOT), up 1 cent to $21.93;

Valero Energy

(VLO) - Get Report

, up $6.32 to $103.11;

Exxon Mobil

(XOM) - Get Report

, up 71 cents to $59.32;

Pfizer

(PFE) - Get Report

, up 8 cents to $25.22;

Lucent Technologies

( LU), down 2 cents to $3.03; and

General Electric

(GE) - Get Report

, down 10 cents to $33.14.

Nasdaq volume leaders included

Sun Microsystems

(SUNW) - Get Report

, up 8 cents to $3.81;

Microsoft

(MSFT) - Get Report

, down 11 cents to $27.07;

Cisco Systems

(CSCO) - Get Report

, up 1 cent to $17.52;

Intel

(INTC) - Get Report

, up 5 cents to $25.62;

Capstone Turbine

(CPST) - Get Report

, down 25 cents to $4.89; and

Sirius Satellite Radio

(SIRI) - Get Report

, unchanged at $6.83.