I believe everyone understands this. However, your limited facts don't allow anyone at this point to provide an accurate response.
So @Critter-3 provides details as to the reporting if it was debt and not equity.
And @Anonymous_ provides commentary on determining if your stock will qualify as Section 1244.
So between the two, you should be able to determine how to report.
Make sure you read the commentary, as there are reporting requirements that need to accompany the tax return other than just inputting the amount of the loss.
If your investment does qualify, it may only qualify in part, but once again, we don't have any details.
Finally, should the investment loss qualify as Section 1244, this will be reported on form 4797 and not Schedule D.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
