The growth in the cybersecurity market many pundits had expected last year didn't materialize, but 2017 is a different story entirely. Providers including Fortinet (NASDAQ:FTNT), Palo Alto Networks (NYSE:PANW), and a host of others are enjoying a banner year.

Fortinet stock is up 28% in 2017, and even Palo Alto, which hasn't seen a profit seemingly forever, is up 21%. The strong results aren't surprising given the rise in data breaches of late, including the recent crack in Equifax's (NYSE:EFX) security. But in Fortinet's case, the reason it could be a gold mine for growth investors is that it's not only in the right market, it's delivering the goods.

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More of the same, please

When Fortinet reports third-quarter earnings on Oct. 26, don't be surprised to see another strong period on both the top and bottom lines -- assuming last quarter, and several before that, are any indication Fortinet should keep the ball rolling.

Last quarter's $363.5 million  in total revenue was a better-than-expected 17% jump compared to a year ago, and CEO Ken Xie's emphasis on service sales and the recurring revenue it generates should help his other goal of maintaining a handle on expenses.

Both product and service revenue climbed last quarter, but it was  the latter that really shined. Product sales rose 4% to $142.7 million, which is a sound result given Fortinet's growth lies more with its service unit. The strong top line was largely due to the 26% increase in service revenue to $220.8 million, which now represents 61% of Fortinet's total, a percentage that's growing with each successive quarter.

Fortinet's earnings per share (EPS) is one thing that separates it from many of its peers, including Palo Alto. The $509.1 million in revenue Palo Alto reported last  quarter was a 27% improvement over 2016. The difference between Fortinet and Palo Alto is that Palo Alto's impressive revenue growth doesn't trickle down due to its sky-high spending.

Another step in the right direction

Despite Palo Alto's revenue growth, its EPS sank 20% to a negative $0.42 compared to 2016's loss of $0.35 a share. Fortinet, on the other hand, translated its strong top line into a significant rise in per-share earnings. A year ago, Fortinet was in Palo Alto's shoes: no profits to show for its stellar revenue growth.

This year is entirely different with EPS soaring to $0.13 a share, demolishing last year's $0.01 a share loss. A big part of the reason Fortinet turned its revenue into profits was that operating expenses inched up a mere 3.6% to $239.32 million, more than acceptable considering its stellar 17% jump in revenue.

An area to improve upon is shaving sales-related costs. As it stands, Fortinet's sales costs of $166.34 million equal 46% of revenue. Though, to Fortinet's credit, relying more on ongoing service revenue minimized its rise in sales and marketing costs to just 2% year over year.

Last but not least

Some growth investors may cringe at Fortinet's valuation of 105.7 times earnings, but there's no need. Fortinet's peer's average  price-to-earnings ratio (P/E) is a mind-boggling 116.9. Better still, looking ahead Fortinet is valued at a rock-bottom 33.9 times future earnings.

Though not all investors are enamored with share buybacks, Fortinet upped its existing program $300 million to $600 million in total, of which $456 million remains to repurchase additional shares between now and the end of Jan. 2018.

A year ago I was more bearish than bullish thanks to Fortinet's money-losing results. However, Xie's renewed expense management efforts and service revenue focus were clearly more than the "CEO-speak" investors often hear when financial performance isn't living up to expectations. But Fortinet is delivering, which is why it could be a gold mine for growth investors.

Tim Brugger has no position in any of the stocks mentioned. The Motley Fool recommends Fortinet and Palo Alto Networks. The Motley Fool has a disclosure policy.