After just five months as a public company, L.A. engineering and consulting company Aecom Technology Corp. is rewarding investors with the help of the surging infrastructure industry.

Aecom's stock has nearly doubled since its launch, propelled by a combination of acquisitions and new contracts, hitting a high of $38.25 on Oct. 11.

Shares sold for $20 each during its initial public offering in May. They were trading at $35.10 on Oct. 18.

The company last week announced it bought Canadian environmental science consulting firm Gartner Lee Ltd. the eighth acquisition in the past year.

"We have a strategy to grow our business through a healthy balance of organic growth and acquisitive growth," said Chief Financial Officer Michael Burke. "We've long been a very active participant in the M & A; sector."

Burke said the company has several other deals in the works.

The immediate benefits of the Gartner Lee acquisition are twofold: to increase its Canadian presence and to bolster its environmental services division.

A notable milestone in the ascendancy of the company was the collapse of a Minnesota bridge in August, which boosted the entire engineering sector. Aecom was awarded a $91 million contract to serve as the prime consultant on the replacement project.

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