Lockheed Martin has become a stock market juggernaut under CEO Marillyn Hewson
WASHINGTON — Nearly seven years ago, Marillyn Hewson became the first woman to run Lockheed Martin — America's biggest defense contractor — and investors have reaped the rewards of her leadership.

Under Hewson, Lockheed has seen its stock surge more than 310% through Tuesday's session and its market capitalization expand to $108 billion from just under $30 billion.

Hewson, who is chairman, president and CEO of Lockheed Martin , joined the defense titan more than 35 years ago as an industrial engineer. She held more than 20 different leadership positions within the company before ascending to the top spot in January 2013.

When asked by Economic Club President David Rubenstein last year about the success of Lockheed under her leadership, Hewson downplayed her influence.

"It isn't all about me on the performance of our company, but I'm really proud about what our team has been able to accomplish ... in my sixth year as CEO," Hewson told Rubenstein. "We have some happy shareholders, yes, but they always keep a bead on us," she added.

In addition to pleasing the company's shareholders, the Kansas native has had to navigate testy waters with America's commander-in-chief.

Before taking office, then president-elect Donald Trump lambasted the crown jewel in Lockheed's portfolio: the F-35.

A day after meeting with Hewson at his Mar-a-Lago resort in Florida, Trump announced via tweet that he asked Boeing to "price-out a comparable" jet because the F-35 program had "tremendous" cost overruns.

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Trump's tweet knocked Lockheed's stock down about 2%, while Boeing shares were up 0.5%. At the time, the tweet shaved off about $1.2 billion of Lockheed Martin's market value.

But it didn't matter in the long run.

Last month, the Pentagon announced a $34 billion F-35 contract with Lockheed Martin, the largest contract yet for the defense company's costly fighter program.

Overall, defense stocks have been a winning investment under Trump.

Since his inauguration, the iShares U.S. Aerospace & Defense ETF (ITA) is up more than 60%, outperforming the S&P 500, which is up about 36% in that time. What's more, the Pentagon's spending power has catapulted to a little over $700 billion — the most in its history.