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Live streaming revenues in the first quarter of 2021 were RMB1,998.6 million (US$305.1 million), compared with RMB2,113.0 million in the same period of 2020. This decrease was primarily due to the reversion of paying users’ consumption of the virtual items to that of the pre-pandemic level, as the pandemic was gradually brought under control in China. This decline was partially offset by our implementation of more effective operational strategies, which helped improve the participation levels and paying behaviors of key paying users on our platform in the period.
Advertising and other revenues in the first quarter of 2021 were RMB154.1 million (US$23.5 million), compared with RMB165.0 million in the same period of 2020. The year-over-year decrease was primarily attributable to the trend of game advertisers normalizing their marketing expenditures, which were relatively higher in the same period last year due to the COVID-19 pandemic.
Cost of revenues in the first quarter of 2021 was RMB1,892.5 million (US$288.9 million), compared with RMB1,792.2 million in the same period of 2020, primarily due to increased revenue sharing fees and content costs.
Revenue sharing fees and content costs in the first quarter of 2021 increased by 5.4% to RMB1,659.6 million (US$253.3 million) from RMB1,574.8 million in the same period of 2020. This was because of the Company’s increased investments in the broadcasting rights for eSports tournaments, in-house production of proprietary events, and quality streamers in the overseas market.
Bandwidth costs in the first quarter of 2021 were RMB172.1 million (US$26.3 million), compared with RMB152.9 million in the same period of 2020. This was mainly due to the promotion of high-quality viewing options offered on the Company’s platform and was partially offset by improved bandwidth efficiency as a result of in-house technology upgrades.
Gross profit in the first quarter of 2021 was RMB260.2 million (US$39.7 million), compared with RMB485.9 million in the same period of 2020. Gross margin in the first quarter of 2021 was 12.1%, compared with 21.3% in the same period of 2020. This decrease was primary due to the increase in content costs for eSports tournaments and bandwidth costs, together with the decrease in revenues.
Sales and marketing expenses in the first quarter of 2021 were RMB209.9 million (US$32.0 million), compared with RMB107.4 million in the same period of 2020. This was mainly attributable to the increased sponsorships and promotions of eSports tournaments compared to the same period of 2020 during the COVID-19 pandemic as well as increased promotional activities for user acquisition.
Research and development expenses in the first quarter of 2021 were RMB111.3 million (US$17.0 million), compared with RMB92.9 million in the same period of 2020. This increase was primarily due to our additional investments in technical personnel.
General and administrative expenses in the first quarter of 2021 were RMB88.1 million (US$13.4 million), compared with RMB84.6 million in the same period of 2020.
Other operating income, net in the first quarter of 2021 was RMB23.9 million (US$3.7 million), compared with RMB16.6 million in the same period of 2020.