Among the nation's major restaurant chains, In-N-Out is still supreme when it comes to the satisfaction of its workers, according to a new study.

The California-based burger chain took the top spot for a 10th straight year, according to an analysis by William Blair, an investment bank and financial services company.

The annual report spans 11 years and is built on over 530,000 reviews of almost 90 restaurant brands, according to

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