Realize gain or loss for 1099-B NOT report to IRS

You must report this even if it is not reported to the IRS.

• This may occur if you transfer stock between brokers or accounts.
• If there was a transfer they may not have gotten an accurate cost basis.

Also, prior to 2008 brokers were not required to record the stock basis of stocks or mutual funds.

what type of security?  on the 1099-B what is the type? 

for types C, D, F, G and X, the broker is not required to report tax basis to the IRS though if you imported it the trade should appear on form 8949.  You are responsible for including this trade on your return.  perhaps if you provide more info we can provide more clarification. actual amounts and personal info like broker are not required