NEW YORK (TheStreet) -- Five key companies reported earnings amidst the extreme ups and downs of the stock market last week. Here's how to trade them in light of the volatility in the larger market. 

Best Buy (BBY - Get Report) , GameStop (GME - Get Report) , Tiffany (TIF - Get Report) , Valspar (VAL) and Toll Brothers (TOL - Get Report) each set their lows last week as stocks plunged at the open last Monday.

Best Buy reported an earnings beat on Tuesday and gapped higher, ignoring the plunge.

Valspar also reported an earnings beat on Tuesday, but weak guidance prevented a bounce.

Toll Brothers reported an earnings miss on Tuesday and continued low.

GameStop popped after Monday's drop in anticipation of solid earnings, then dropped on Friday despite an earnings beat.

Tiffany stayed near Monday's low all week after missing earnings estimates on Thursday.

Here are the weekly charts and key trading levels for these five stocks, starting with the weekly chart for Best Buy.


Courtesy of MetaStock Xenith

Best Buy had a close of $35.97 on Friday, down 6.6% year to date. It is 27% above last Monday's crash low of $28.32. The stock popped above its 50-day simple moving average of $32.95 on Tuesday, then recaptured its 200-day simple moving average of $35.86 on Friday.

The weekly chart for Best Buy is positive, with the stock above its key weekly moving average of $33.09, with its weekly momentum reading rising to 25.52. That's up from 14.76 on Aug. 21, pulling above the oversold threshold of 20.00. Note that last Monday's low was above the 200-week simple moving average of $27.73.

Investors looking to buy Best Buy should place a good till canceled limit order to purchase the stock if it drops to $26.81, which is a key level on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit order to sell the stock if it rises to $41.41, which is a key level on technical charts until the end of September.

Here's the weekly chart for GameStop.


Courtesy of MetaStock Xenith

GameStop had a close of $42.49 on Friday, up 25.7% year to date and 11.1% below its 2015 high of $47.82, set on Aug. 14. Last week, this stock traded both below its 200-day simple moving average of $40.29 and above its 50-day simple moving average of $45.45. It closed in between.

The weekly chart for GameStop is negative, with the stock below its key weekly moving average of $44.67, and with its weekly momentum reading declining to 72.23, down from 77.33 on Aug. 21. Note that the stock is above the 200-week simple moving average of $34.65, last tested as the "reversion to the mean" at $31.97 during the week of Jan. 16, 2015.

Investors looking to buy GameStop should place a good till canceled limit order to purchase the stock if it drops to $37.93, which is a key level on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit order to sell the stock if it rises to $48.18, which is a key level on technical charts until the end of 2015.

Here's the weekly chart for Tiffany.


Courtesy of MetaStock Xenith

Tiffany had a close of $83.61 on Friday, down 21.8% year to date and just 2.6% above its Aug. 24 low of $81.50. Last week this stock stayed below its 50-day and 200-day simple moving averages of $91.88 and $92.60, respectively, which is a "death cross."

The weekly chart for Tiffany is negative, with the stock below its key weekly moving average of $89.67, and with its weekly momentum reading declining to 49.24, down from 63.58 on Aug. 21. Note that the stock is above the 200-week simple moving average of $79.39.

Investors looking to buy Tiffany should place a good till canceled limit order to purchase the stock if it drops to $81.13, which is a key level on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit order to sell the stock if it rises to $95.21, which is a key level on technical charts until the end of 2015.

Here's the weekly chart for Toll Brothers.


Courtesy of MetaStock Xenith

Toll Brothers had a close of $36.64 on Friday, up 6.9% year to date, but 13.2% below its Aug. 19 high of $42.19. Last week this stock was both above its 50-day simple moving average of $38.50 and below its 200-day simple moving average of $36.74, with Friday's close just below that.

The weekly chart for Toll Brothers is negative, with the stock below its key weekly moving average of $38.29, and with its weekly momentum reading declining to 66.22, down from 69.08 on Aug. 21. Note that the stock is above the 200-week simple moving average of $32.61.

Investors looking to buy Toll Brothers should place a good till canceled limit order to purchase the stock if it drops to $20.57, which is a key level on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit order to sell the stock if it rises to $39.23, which is a key level on technical charts until the end of September.

Here's the weekly chart for Valspar.


Courtesy of MetaStock Xenith

Valspar had a close of $74.20 on Friday, down 14.2% year to date, and just 2.6% above its Aug. 26 low of $72.32. Last week, this stock stayed below its 50-day and 200-day simple moving averages of $81.66 and $84.09, respectively, which is a "death cross."

The weekly chart for Valspar is negative, with the stock below its key weekly moving average of $80.18, and with its weekly momentum reading declining to 23.44, down from 27.75 on Aug. 21. Note that the stock is above the 200-week simple moving average of $67.11.

Investors looking to buy Valspar should place a good till canceled limit order to purchase the stock if it drops to $71.89, which is a key level on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit order to sell the stock if it rises to $90.03, which is a key level on technical charts until the end of September.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.