This is what the smart CEOs of WallStreetBets meme stocks did when they saw retail traders rallying their stocks against shorts from Wall St bankers/funds. Once they figured out what was going on, they filed Registrations. And then when volume and price action came back on the next wave... they sold shares to scoop up their operating/growth funds at high prices for their stock.
I think more than a few smart investors/traders have figured out that PERHAPS Zion corporate management has reason to believe the stock will be seeing some serious price-volume action in the near future, and they're getting ready to put a few shares out there when the time is right.
With volume (from certain good news), it's a whole lot more beneficial for ALL shareholders (including insiders) to sell shares in the market at dollars on volume than the slow bleed of 10M shares/month via the DSPP in the sub-dollar range.