 BEIJING, April 16, 2021 PRNewswire -- Sunlands Technology Group NYSE: STG Sunlands or the Company, a leader in Chinas online post-secondary and professional education, today announced that it has filed its Annual Report on Form 20-F for the full year ended December 31, 2020 with the U.S. Securities and Exchange Commission the SEC. The annual report can be accessed on the Companys investor relations website at and on the SECs website at 