Company insiders will sell their own stock for a ton of different reasons. They might need the cash for a new house, or they might need the money to pay a large tax bill. Sometimes they sell simply for diversification purposes.

Insiders, however, usually buy their own shares for one reason only: They think the stock is cheap and has monster upside.

Recently, a number of companies' corporate insiders have been loading up on their own stock. These insiders smell opportunity, which warrants a closer look at these names.

Qualcomm

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One technology player that insiders are jumping into here is Qualcomm (QCOM) - Get Report , which is engaged in the development and commercialization of a digital communication technology called code division multiple access.

Qualcomm has a market cap of $82 billion. This stock trades at a fair valuation, with a forward price-to-earnings of 13.67. Its estimated growth rate for this year is -4.7%, and for next year it's pegged at -3.8%. This is not a cash-rich company, since its total cash position is $9.98 billion and its total debt is $11.94 billion.

A director just bought 9,000 shares, or $491,000 worth of stock, at $54.59 per share.

If you're bullish on Qualcomm, then I would look for long-biased trades as long as this stock is trending above its 20-day at $54.22 and then once it breaks out above a key downtrend line over $57 to $57.53 with volume near or above its three-month average of 10.49 million shares. If that breakout develops soon, then this stock will set up to re-test or possibly take out its next resistance levels at $59 to its 200-day at $60.67 a share.

Qualcomm is a holding in our Income Seeker portfolio. Learn more now.

Twilio

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Another application software player that insiders are in love with here is Twilio (TWLO) - Get Report , which enables developers to build, scale and operate real-time communications within software applications.

Twilio has a market cap of $2.26 billion. This stock trades at a fair valuation, with a price-to-book of 6.54. Its estimated growth rate for this year -81.2%, and for next year it's pegged at 69%. This is a cash-rich company, since its total cash position is $288.53 million and its total debt is zero.

The CEO just bought 100,000 shares, or $2.34 million worth of stock, at $23.43 per share.

If you're bullish on Twilio, I would look for long-biased trades if this stock is trending above its recent low of $22.80 and then once it breaks out above some resistance levels at $25.32 to around $26.50 with volume near or above its three-month average of 3.39 million shares. If that breakout hits soon, then this stock will set up to re-fill some of its recent gap-down-day zone that started at $34.45 a share.

Sohu.com

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One technology player insiders are active in here is Sohu.com (SOHU) - Get Report , which provides online media, search, and game services on personal computers, mobile devices, and tablets in China.

Sohu.com has a market cap of $1.59 billion. This stock trades at a reasonable valuation, with a price-to-book of 1.70. Its estimated growth rate for this year -11.6%, and for next year it's pegged at 47.3%. This is a cash-rich company, since its total cash position is $1.26 billion and its total debt is zero.

The CEO just bought 25,000 shares, or $1 million worth of stock, at $40.06 per share.

If you're in the bull camp on Sohu.com, I would look for long-biased trades if this stock is trending above its 200-day at $39.41 and once it breaks out above some resistance levels at $42.43 to $42.68 with volume near or above its three-month average of 226,242 shares. If that breakout triggers soon, then this stock will set up to re-test or possibly take out its next resistance levels at $43.60 to its 52-week high of $45.84 a share.

General Electric

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One industrial goods player that insiders are active in here is General Electric (GE) - Get Report , which operates as an infrastructure and technology company worldwide.

General Electric has a market cap of $239.81 billion. This stock trades at a reasonable valuation, with a forward price-to-earnings of 14.61. Its estimated growth rate for this year is 9.4%, and for next year it's pegged at 16%. This is not a cash-rich company, since its total cash position is $7.87 billion and its total debt is $128.67 billion.

The CEO just bought 100,000 shares, or $2.80 million worth of stock, at $28.03 per share.

If you're bullish on General Electric, I would look for long-biased trades if this stock is trending above its new 52-week low of $27.43 and then once it breaks out above resistance levels at $28 to $28.50 with volume near or above its three-month average of 29.95 million shares. Some possible upside targets off that breakout are its 50-day at $29.46 or its 200-day at $29.88 a share.

General Electric is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells GE? Learn more now.

Opko Health

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My final stock with some large insider buying is biotechnology player Opko Health (OPK) - Get Report , which engages in the diagnostics and pharmaceuticals business in the U.S., Ireland, Chile, Spain, Israel, and Mexico.

Opko Health has a market cap of $3.76 billion. This stock trades at a reasonable valuation, with a price-to-book of 1.65. Its estimated growth rate for this year is -300%, and for next year it's pegged at 85%. This is a cash-rich company, since its total cash position is $131.10 million and its total debt is $39.30 million.

The CEO just bought 1,125,000 shares, or $7.82 million worth of stock, at $6.96 per share.

If you're bullish on Opko Health, I would look for long-biased trades if this stock is trending above its new 52-week low of $6.46 and then once it breaks out above some resistance at $6.80 with volume near or above its three-month average of 4.56 million shares. Some possible upside targets off that breakout are $7.13 to $7.25, or even its 50-day at $7.65 a share.

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