Turner Surety and Insurance Brokerage, Inc. (TSIB) is one of the largest privately held insurance brokers in the US. Representing billions of dollars in construction volume, their experience in the field brings firsthand knowledge and understanding of its unique risks and complexities.Turner Surety and Insurance Brokerage, Inc. (TSIB) is one of the largest privately held insurance brokers in the US. Representing billions of dollars in construction volume, their experience in the field brings firsthand knowledge and understanding of its unique risks and complexities.