Should you sell Telestone Technologies (Nasdaq: TSTC) today?

The decision to sell a stock you've researched and followed for months or years is never easy. If you fall in love with your stock holdings, you risk becoming vulnerable to confirmation bias -- listening only to information that supports your theories, and rejecting any contradictions.

In 2004, longtime Fool Bill Mann called confirmation bias one of the most dangerous components of investing. This warning has helped my own personal investing throughout the Great Recession. Now, I want to help you identify potential sell signs on popular stocks within our 4-million-strong Fool.com community.

Today, I'm laser-focused on Telestone, ready to evaluate its price, valuation, margins, and liquidity. Let's get started!

Don't sell on price
Over the past 12 months, Telestone has risen 12.6% versus an S&P 500 return of 11.3%. Investors in Telestone have every reason to be p roud of their returns, but is it time to take some off the top? Not necessarily. Short-term outperformance alone is not a sell sign. The market may be just beginning to realize the true, intrinsic value of Telestone. For historical context, let's compare Telestone's recent price with its 52-week and five-year highs. I've also included a few other businesses across the broader telecommunications infrastructure industry:

Company

Recent Price

52-Week High

5-Year High

Telestone $14.18 $24.94 $24.90
Mediacom Communications (Nasdaq: MCCC) $8.48 $8.53 $10.40
American Tower (NYSE: AMT) $51.59 $53.52 $53.50
Crown Castle International (NYSE: CCI) $42.33 $44.46 $44.50

Source: Capital IQ, a division of Standard & Poor's.

As you can see, Telestone is down from its 52-week high. If you bought near the peak, now's the time to think back to why you bought it in the first place. If your reasons still hold true, you shouldn't sell based on this information alone.

Potential sell signs
First up, we'll get a rough idea of Telestone's valuation. I'm comparing Telestone's recent P/E ratio of 15.6 with where it has been over the past five years.


Source: Capital IQ, a division of Standard & Poor's.

Telestone's P/E is higher than its five-year average, which could indicate the stock is overvalued. A high P/E isn't always a bad sign, because the company's growth prospects may also be increasing alongside the market's valuation. However, it definitely indicates that, on a purely historical basis, Telestone looks expensive.

Now, let's look at the gross margins trend, which represents the amount of profit a company makes for each $1 in sales, after deducting all costs directly related to that sale. A deteriorating gross margin over time can indicate that competition has forced the company to lower prices, that it can't control costs, or that its whole industry's facing tough times. Here is Telestone's gross margin over the past five years:


Source: Capital IQ, a division of Standard & Poor's.

Telestone is having no trouble maintaining its gross margin, which tends to dictate a company's overall profitability. This is solid news; however, Telestone investors need to keep an eye on this over the coming quarters. If margins begin to drop, you'll want to know why.

Next, let's explore what other investors think about Telestone. We love the contrarian view here at Fool.com, but we don't mind cheating off of our neighbors every once in a while. For this, we'll examine two metrics: Motley Fool CAPS ratings and short interest. The former tells us how Fool.com's 170,000-strong community of individual analysts rate the stock. The latter shows what proportion of investors are betting that the stock will fall. I'm including other peer companies once again for context.

Company

CAPS Rating

Short Interest (% of Float)

Telestone **** 17.7
Mediacom Communications * 4.0
American Tower *** 1.0
Crown Castle International * 2.3

Source: Capital IQ, a division of Standard & Poor's.

The Fool community is rather bullish on Telestone. We typically like to see our stocks rated at four or five stars. Anything below that is a less-than-bullish indicator. I highly recommend you visit Telestone's stock pitch page to see the verbatim reasons behind the ratings.

Here, short interest is at a high 17.7%. This typically indicates that large institutional investors are betting against the stock.

Now, let's study Telestone's debt situation, with a little help from the debt-to-equity ratio. This metric tells us how much debt the company has taken on, relative to its overall capital structure.


Source: Capital IQ, a division of Standard & Poor's.

Telestone has been taking on some additional debt over the past five years. When we take into account increasing total equity over the same time, this has caused debt-to-equity to increase, as seen in the above chart. Based on the trend alone, that's a bad sign. I consider a debt-to-equity ratio below 50% to be healthy, though it varies by industry. Telestone is below this level, at 10.9%. While the company technically fails my test on a trend basis, that's a very manageable amount of debt.

The last metric I like to look at is the current ratio, which lets investors judge a company's short-term liquidity. If Telestone had to convert its current assets to cash in one year, how many times over could the company cover its current liabilities? As of the latest filing, Telestone has a current ratio of 1.98. This is a healthy sign. I like to see companies with current ratios equal to or greater than 1.5.

Finally, it's highly beneficial to determine whether Telestone belongs in your portfolio -- and to know how many similar businesses already occupy your stable of investments. If you haven't already, be sure to put your tickers into Fool.com's free portfolio tracker, My Watchlist. You can get started right away by clicking here to add Telestone.

The recap

Telestone has failed three of the quick tests that would make it a sell. Does it mean you should sell your Telestone shares today solely because of this? Not necessarily, but keep your eye on these trends over the coming quarters.

Remember to add Telestone to My Watchlist to help you keep track of all our coverage of the company on Fool.com.

If you haven't had a chance yet, be sure to read this article detailing how I missed out on more than $100,000 in gains through wrong-headed selling.

Jeremy Phillips does not own shares of the companies mentioned.

American Tower is a Motley Fool Rule Breakers selection. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.