RE: looks like the dumps are related to ZEN appears to be getting worked down by a Trading ALGO.
MM's will use 2 Houses, (their own House & ANON) that way they can hit a Bid, but not lose any shares. Brokers have been doing this on the TSXV for years..."spoofing" the Bid -or- Ask side to show interest -or- lack of interest in a stock depending on what their game plan is.
The share price has been worked down for weeks prior to yesterday's News...mostly setting it up on ALPHA. They stack the Ask side, and remove the Bids around 2 pm to show weakness to shake out any nervous Retail investors.
May be this is about to get changed...don't be caught "short" :)
Iron