I expect you have a "real" loss, but one that you can't recognize for tax purposes. That can happen with mergers.
I'd also guess that some amount of "proceeds" were reported to you - why would a 1099-B be issued otherwise? - but that's a mystery since you've not disclosed any.
Why don't you tell us the companies involved? That would help quite a bit.
It would also be very helpful to attache a picture of the 1099-B - any personally information redacted, of course.
