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NEW YORK (TheStreet) -- Apple (AAPL) - Get Apple Inc. Report and Twitter (TWTR) - Get Twitter, Inc. Report are two of the most widely followed stocks on the market, and some may wonder if their slides offer an opportunity to buy low.

To answer that question, here are some technical guideposts that should help investors and traders decide at what prices to buy and sell shares of the two companies.

Shares of Apple have been falling on worries about iPhone sales in China and questions about the acceptance of the iWatch. The stock is below its 200-day simple moving average for the first time in two years.

Twitter, meanwhile, has had a tough time monetizing its followers since it become a publicly traded company in November 2013.

Comparing the daily and weekly charts of Apple and Twitter won't be complete because a recent IPO does not have enough historical data for all of the possible tools of technical analysis. The charts below, however, should still be useful for investment decisions for the rest of the year.

Apple was a momentum stock that has lost its steam. Here is its daily chart.


Courtesy of MetaStock Xenith

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After Apple entered the Dow 30 on March 18 with a close of $128.47, the stock continued to go higher, setting its all-time intraday high of $134.54 on April 28. The stock then declined to as low as $119.22 on July 9, holding its 200-day simple moving average, which was then at $118.72.

The subsequent rebound was in anticipation of an earnings beat on July 21. The stock was poised for a new high but instead gapped lower on July 22, setting the stage for further weakness.

The price action shown on July 20/July 21 resulted in what technicians call an "island reversal" as a circle can be drawn around those two days on the chart. July ended with Apple just above its 200-day simple moving average which failed to hold on Monday leading to new lows on Tuesday.

The next negative to track is a potential "death cross," where the 50-day declines below the 200-day. Apple has been under a "golden cross" since Sept. 13, 2013.

Here's the weekly chart for Apple.


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The close last Friday resulted in a negative weekly chart for Apple. The weekly chart would remain negative given a close this Friday below the stock's key weekly moving average, which is now at $123.64. The weekly momentum reading is projected to decline to 33.15 this week, down from 40.28 last Friday.

The 200-week simple moving average of $85.94 is the downside risk on a "reversion to the mean." This moving average held at the low of $55.55 set during the week of June 28, 2013.

Investors looking to buy Apple should place a good-till-canceled limit order to purchase the stock if it drops to $110.43, which remains a key level on technical charts until the end of 2015.

Investors looking to book profits should place a good-till-canceled limit order to sell the stock if it rises to $121.79 and $126.38, which are key levels on technical charts until the end of this week and to the end of August, respectively.

Here's the daily chart for Twitter.


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Twitter became a publicly traded company on Nov. 7, 2013, and set its all-time intraday high of $74.73 on Dec. 26 of that year. Since then, the stock has trended lower, setting an all-time intraday low of $28.69 on Monday. From high to low, the shares declined 61.6%.

The stock is below its 50-day and 200-day simple moving averages of $35.24 and $41.07, respectively, which has been in the "death cross" since June 2.

Here's the weekly chart for Twitter.


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The weekly chart has been negative since the beginning of May from $37.85 and has been oversold since the end of May. The weekly chart would stay negative but oversold it the stock ends this week on below its key weekly moving average of $34.22.

Investors looking to buy Twitter should place a good-till-canceled limit order to purchase the stock if it drops to $22.12, which is a key level on technical charts until the end of 2015. A key level still in play until the end of 2015 is $30.09.

Investors looking to reduce holdings should place a good-till-canceled limit order to sell the stock if it rises to $32.06 and $35.02, which are key levels on technical charts until the end of this week and to the end of August, respectively.

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