The major indexes started the week on a down note on the back of a strengthening dollar. The Dow closed down 1%, the S&P fell 1% and the Nasdaq dropped 0.6%.

Here are Monday’s winners and losers:

Winners

RadioShack Corp. (RSH)
Quarterly sales results pushed shares of the electronics retailer up 15.9%. RadioShack shares last traded at $18.15, a gain of $2.49 on the day.

SanDisk Corp. (SNDK)
The flash memory device manufacturer rose 8.5% after the company reported quarterly results. SanDisk shares closed at $24.01, up $1.89 on the day.

Pioneer Natural Resources Co. (PXD)
The oil exploration company hit a yearly high despite a dip in crude prices Monday. PXD shares ended the session $45.32, a gain of $2.58 on the day.

Amazon.com Inc. (AMZN)
The e-retailer continued to watch shares climb Monday, adding another 5.2% to start the week. Amazon shares finished the day at $124.64, up $6.15.

Teradata Corp. (TDC)
The data warehousing company added 2.4% after Barron’s raved about the stock this past weekend. Teradata shares last traded at $29.02, a gain of 69 cents on the day.

Losers

Genworth Financial Inc. (GNW)
The financial services company fell 8.1%, leading the sector down. GNW shares closed at $9.56, a loss of 84 cents on the day.

Fifth Third Bancorp (FITB)
The regional bank sank 7.9% after a number of analyst downgrades. Fifth Third shares ended the session at $9.52, down 82 cents on the day.

Regions Financial Corp. (RF)
Another regional bank feeling the heat to start the week, Regions saw its shares dive 7.8% on Monday. Regions shares finished the day at $5.10, a loss of 43 cents on the day.

Tellabs Inc. (TLAB)
The communications equipment company saw its shares plunge 7.5% Monday after reporting dismal quarterly revenue numbers and a weak view. Tellabs shares last traded at $6.16, down 50 cents on the day.

MBIA Inc. (MBI)
The insurer continued its losing streak, dropping another 7.4% on Monday. MBIA shares closed at $4.58, a loss of 37 cents on the day.