| SC 13G/A | 2024-03-07 | Peng Ou | Sunlands Technology Group | 2,833,024 | 52.2% | EDGAR |
| SC 13G/A | 2024-03-07 | Tongbo Liu | Sunlands Technology Group | 513,117 | 16.1% | EDGAR |
| SC 13G/A | 2024-01-24 | AREO HOLDINGS LTD | Sunlands Technology Group | 309,326 | 11.4% | EDGAR |
| SC 13G/A | 2023-02-08 | AREO HOLDINGS LTD | Sunlands Technology Group | 309,326 | 14.6% | EDGAR |
| SC 13G/A | 2023-02-03 | Tongbo Liu | Sunlands Technology Group | 536,780 | 17.2% | EDGAR |
| SC 13G/A | 2023-02-03 | Peng Ou | Sunlands Technology Group | 2,833,024 | 53.0% | EDGAR |
| SC 13G/A | 2022-02-14 | Dragoneer Investment Group, LLC | Sunlands Technology Group | 0 | 0.0% | EDGAR |
| SC 13G/A | 2022-02-11 | Tongbo Liu | Sunlands Technology Group | 1,027,972 | 35.8% | EDGAR |
| SC 13G/A | 2022-02-11 | Peng Ou | Sunlands Technology Group | 2,833,024 | 60.6% | EDGAR |
| SC 13G/A | 2022-02-08 | AREO HOLDINGS LTD | Sunlands Technology Group | 309,326 | 16.3% | EDGAR |
| SC 13G | 2021-03-04 | Tongbo Liu | Sunlands Technology Group | 1,036,654 | 25.2% | EDGAR |
| SC 13G | 2021-03-04 | Peng Ou | Sunlands Technology Group | 2,833,024 | 68.9% | EDGAR |
| SC 13G/A | 2021-02-16 | STAD MARC | Sunlands Technology Group | 97,179 | 5.6% | EDGAR |
| SC 13G/A | 2021-02-10 | AREO HOLDINGS LTD | Sunlands Technology Group | 309,326 | 17.9% | EDGAR |
| SC 13G/A | 2020-02-14 | STAD MARC | Sunlands Technology Group | 11,907,496 | 6.9% | EDGAR |
| SC 13G | 2020-02-14 | Tongbo Liu | Sunlands Technology Group | 1,052,504 | 26.2% | EDGAR |
| SC 13G | 2020-02-14 | Peng Ou | Sunlands Technology Group | 2,833,024 | 70.4% | EDGAR |
| SC 13G/A | 2020-02-12 | AREO HOLDINGS LTD | Sunlands Technology Group | 309,326 | 17.9% | EDGAR |
| SC 13G | 2020-01-06 | AREO HOLDINGS LTD | Sunlands Technology Group | 309,326 | 17.4% | EDGAR |
| SC 13G | 2019-08-14 | Primavera Capital Management Ltd | Sunlands Technology Group | 826,389 | 31.8% | EDGAR |