Supreme Court

Case: 26-0320    
26-0320
04/06/2026
Petition for Writ of Mandamus
IN RE MATTR US INC.; SHAWCOR, INC.; FLEXPIPE SYSTEMS (US) LLC; AND SHAWCOR COMPOSITE PRODUCTION SYSTEMS 
 
Appellate Briefs
Date▲▼Event Type▲▼Description▲▼RemarksDocument
06/03/2026Reply to ResponseRelator Reply in Support of Petition for Writ of Mandamus filed on behalf of Mattr US Inc., et al.
05/26/2026Response to PetitionReal Parties in Interest Response to Petition for Writ of Mandamus filed on behalf of SM Energy Company.
04/06/2026Petition for Writ of Mandamus filedRelator Petition for Writ of Mandamus filed on behalf of Mattr US Inc., et al.
Case Events
Date▲▼Event Type▲▼Disposition▲▼RemarksDocument
09/09/2026Petition for Writ of Mandamus disposedDenied
08/19/2026Supplement to Motion filed  Supplement in Support of Motion to Stay filed on behalf of Mattr US Inc., et al.
06/03/2026Reply to Response  Reply in Support of Petition for Writ of Mandamus filed on behalf of Mattr US Inc., et al.
05/28/2026Call received  Call received from counsel.
05/26/2026Response to Petition  Response to Petition for Writ of Mandamus filed on behalf of SM Energy Company.
04/24/2026Supreme Court of Texas Ordered Response  Court ordered response to petition for writ of mandamus due no later than May 26, 2026.
04/13/2026Reply to Response to Motion  Reply in Support of Motion to Stay filed on behalf of Mattr US Inc., et al.
04/09/2026Call received  Call received from counsel for Relator.
04/08/2026Response to Motion filed  Response to Motion to Stay filed on behalf of SM Energy Company.
04/07/2026Case forwarded to Court 
04/06/2026Case Record Filed  Mandamus Record filed on behalf of Mattr US Inc., et al.
04/06/2026Motion to Stay Filed   Motion to Stay filed on behalf of Mattr US Inc., et al.
04/06/2026Petition for Writ of Mandamus filed  Petition for Writ of Mandamus filed on behalf of Mattr US Inc., et al.
04/06/2026Court reporter/recorder's record 
Calendars
Set Date▲▼Calendar Type▲▼Reason Set▲▼Remarks▲▼
04/06/2026Motion being reviewed by CourtMotion to stay 
04/07/2026Work-Up by Staff / Review by JusticesUnder Review 
Parties
Party▲▼Party Type▲▼Representative▲▼
Seaton, Judge, R. ShaneRespondent 
SM Energy CompanyReal Party in Interest Mr. Wesley N. Harris
Ms. Brandy Manning
Mr. Jesse R. Pierce
Ms. Leah Lanier
Shawcor Composite Production SystemsRelatorMr. Chris C. Pappas
Kathryn Laflin
Mr. Jody Sanders
Mr. Andrew J. Sarne
Ms. Caitlyn E. Hubbard
Mr. David E. Keltner
Mr. Logan Burke
Flexpipe Systems (US) LLCRelator 
Mattr US Inc.Relator 
Shawcor, Inc.Relator 
Court of Appeals Information:
Denied 
___ SW3d ___, 02-20-26 
11th Court of Appeals 
Honorable W. Bruce Williams 
Trial Court Information
118th District Court 
Howard 
Honorable R. Shane Seaton 
56177