if the LLC was a Partnership or S-Corportion in which you own a portion, there would be no 1099-Div issued and a 1099-INT would only be issue if you invested in company debt. Also issuing a K-1 is mandatory for these types of businesses.
The IRS position is that you are not entitled to any deduction unless the investment is totally worthless. While the company filed for bankruptcy, that does not mean it's totally worthless. there could have been a restructuring, or it could have been liquidated to pay off secured creditors to the extent possible. unsecured crediors would share in any remaining proceeds and last to get money would be shareholders.
I THINK this was a C-Corp but can't be sure. If your investments are totally worthless then you are entitled to a capital loss deduction.
you should review the paperwork for your investment and any other communications from the company to determine exactly what you investment was.
generally, unless this was totally a private venture, there would be some form of memorandum or prospectus discussing the company and potential tax consequences. If you know who their accounting firm was perhaps contact them.
