Most insurance companies will take your work history and experience as a means to decide whether your company is worth the risk. If you don't have much, you are high-risk.

My company is only 13 months old, but because of my extensive work experience and history in the industry I didn't have any problems obtaining insurance coverage.

Other insurance companies may set very high premiums to compensate for lack of experience.  I'm not sure how to get around it, other than diligence.  Just like clients, some insurance agent will decide that the risk is unacceptable.  

Some people go through TIAC, they are associated with ALTA (but you must be an ALTA member to qualify).  I think NALTEA is working on getting rates for members too.  If not, they should be.  Check them out at www.naltea.org or contact one of the NALTEA Officers.  They should be able to help.