6060 AMERICAN PLAZA, TULSA, OK
End of Material Contract, Completing Asset Acquisition or Sale, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Material Modifications to Rights of Security Holders, Changes in Board, Management or Compensation, Shareholder votes
Earnings Release
Reg. FD
Material Contracts, Reg. FD
Q2
Q1
FY 2021
Q3
FY 2020
Notice of Suspension of Duty to File Reports
Schedule 13E-3 - Going Private Transaction
Registration Statement for Securities to be Offered to Employees
Effectiveness Notice
Registration Statement for Securities Offered under a Shelf Registration
Prospectus filed pursuant to Rule 424(b)(3)
Amended Registration Statement for Securities Offered under a Shelf Registration
Additional Proxy Materials
Definitive Merger Proxy Statement
PRER14A
Definitive Proxy Statement
Definitive Information Statement
PRER14C
Amended Schedule 13G - Ownership Report
Statement of Changes in Beneficial Ownership
Notification Filed by a National Security Exchange
S-8 POS
Amended Schedule 13E-3 - Going Private Transaction
Correspondence