Shares of construction and engineering companies opened mixed on Thursday as the broader market wobbled after oil prices touched a new record and a reading on the service sector came in weaker than expected.

In sector news, a Morgan Joseph analyst upgraded shares of Jacobs Engineering Group Inc. to "Buy" from "Hold," saying the company is positioned to benefit from the oil and gas markets.

Here's how some shares of construction and firms are faring:

Perini Corp., up 36 cents to $28.31.

URS Corp., down $1.11, or 2.8 percent, to $38.37.

Quanta Services Inc., down $1.72, or 5.7 percent, to $29.52.

Jacobs, up $2.22 , or 2.9 percent, to $78.94

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