3 Top Defense Stocks to Watch in October

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Defense stocks haven't really had a very good year. With only a few exceptions, most defense stocks are relatively flat since January, and nearly every defense stock has fallen by double digits from its 52-week peak as of this writing. Furthermore, the industry as a whole continues to trade for above-average valuations, at least based on their historical ranges, and that probably means it's more a space to watch today than one to buy into.

For instance, Northrop Grumman Corporation (NYSE: NOC), as a highly valued and highly profitable defense contractor, could be in for a reckoning based on changes in its recent business mix.

But at the same time, there's some interesting opportunity, such as highly diversified Boeing Co. (NYSE: BA), which isn't cheap by any means, but has a massive commercial aviation business set up for decades of megaprofits, while BAE Systems (NASDAQOTH: BAESY) continues to trade for a far cheaper price than its peers, while being on track to deliver improving results.

Man in a gray suit looking through binoculars.
Man in a gray suit looking through binoculars.

Image source: Getty Images.

If you're looking to the defense industry right now, keep reading to learn why three seasoned Motley Fool contributors tagged these as defense stocks to watch in October.

Is this the month Northrop Grumman gets its wings clipped?

Rich Smith (Northrop Grumman): If I'm being honest, I'm going to be watching a lot of defense stocks in October. You see, July was the last round of defense company earnings reports -- and three months on, that means that October is the month when most defense companies can be expected to next report earnings (this time, for Q3 2018).

That being said, if forced to pick just one company to watch, I'm going to focus my efforts on Northrop Grumman.

Why? Because margins, that's why.

I've mentioned a couple times already how Northrop Grumman's profit margins were at or near all-time highs. According to data from S&P Global Market Intelligence, Northrop's last 12 months showed the company earning literally historic all-time high operating profit margins of 13.3%. Northrop's only hit that number once before -- ever -- back in 2014. The fact that it's back at 13.3% today tells me something's probably got to give. Defense stocks are cyclical, and Northrop can't maintain this level of profitability indefinitely.

My hunch? With sales of aerospace systems making up a larger and larger proportion of Northrop's total sales, and sales of the more profitable mission systems division growing more slowly, this is the quarter we'll see Northrop Grumman's average profit margin begin coming back down to Earth.