How often are FedEx, UPS and DHL late on their deliveries?
What are their guarantees for on time deliveies? 
If they are late, what percent of companies file a claim
for re-imbursement?

What companies spend the most money on overnight shipments? Is there a
list of the top 100 companies who use overnight shipping?

What is the total dollars spent annually on overnight shipping?

Any info on late shipments and refund claims would be appreciated.

You are likely to do better if you post each of these inquiries as a
separate question. When many questions are bundled together,
Researchers may be hesitant to take on a project, since it is
sometimes difficult to find all the information asked for.

It is not necessary to answer all aspects of the question.
Any information would be appreciated.

no way you get useful information like this