I think what's happened here is that some company has snapped up PeakStream and deliberately kept it silent. If it's such hot property, would you want news of such an acquisition taking place? There'd be bids, counterbids, and always the chance of headhunters being hired to call up the ex-PeakStream people at their new place of work and attempt to lure them away...
No... much better to swoop in and carry them off to a new place.
I could be completely wrong, of course... it might just be a power outage in the area and they've all gone home for the [day|week|afternoon|silly season]...