The document titles are a bit confusing, but it's likely one or more of these people are lead plaintiff: Melody Guy Dennis Robertson George P Rambo Riley Crumley Virginia Victoria Rideout
Original Complaint came from: Cindy Hurrelbrink Peak Robert W. Peak
Case number is: 3:18-cv-02067 Case name is: Peak et al v. Zion Oil & Gas Inc et al
Attorneys seem to be from Pomerantz LLP and The Briscoe Law Firm (TX based) I don't know if this is a consolidated filing from different firms or not though, but no mention of Schall.
Based on the docket, I guess either a response or schedule for response is due in 14 days, on October 23: