Those 773,000 shares by non corporate insiders are likely acquired via employee stock option plan (ESOP) as part of the company's benefit package. That they hold 11% of the float, or 4 million shares, is indicative of steady accumulation over the past few(?) years and such a plan would be the only way they could track what individual employees decide to do with their disposable income. Also tracking of ESOP would be required by law for tax purposes. 

Side note, the iHub board has had some outstanding technical posts and insight, including this one by allwillbewave that gives an understandable (even for me) explanation of what differentiates Celestial AI from others. LabMan, Telling and Breeze all worth a read as well, among others. 

https://investorshub.advfn.com/boards/read_msg.aspx?message_id=171846674