The PowerShares QQQ ETF (QQQ) has had a powerful 2017, rallying some 30% so far on the year. But one industry not enjoying such a great ride? Cyber security.

That's an interesting note, TheStreet's Jim Cramer pointed out on CNBC's "Stop Trading" segment Monday. That's very surprising, given how important securing personal data has become. One only needs to look to the Equifax (EFX) hack to understand why companies are looking to increase their cyber security.

Cramer also pointed out the 8% growth in security revenue for Cisco Systems (CSCO) in the company's recent earnings results. Palo Alto Networks (PANW) reports on Monday after the close, so it will be interesting to see what management has to say.

Is Cisco seeing its security revenue rise because it is taking market share from its competitors in which Palo Alto is an opponent? Or has there been a large increase in security spending to ensure more companies don't end up like Equifax?

That's what Cramer, who also manages the Action Alerts PLUS charitable trust portfolio, will be looking for Monday night.

More of What's Trending on TheStreet:

More from Stocks

First Horizon National: Why I Would Pass on This Regional Banking Stock

First Horizon National: Why I Would Pass on This Regional Banking Stock

Jim Cramer Breaks Down the Fed Hawkishness and the Fourth Industrial Revolution

Jim Cramer Breaks Down the Fed Hawkishness and the Fourth Industrial Revolution

Jim Cramer Unveils the 10 Best Stocks for a Market Pullback

Jim Cramer Unveils the 10 Best Stocks for a Market Pullback

Veeva Systems: Strong Fundamentals but Weakening Technicals

Veeva Systems: Strong Fundamentals but Weakening Technicals

Dow Takes Sharp Turn Lower on Rates Fears, Tech Shares Sink

Dow Takes Sharp Turn Lower on Rates Fears, Tech Shares Sink