Group 1 - The recombinant protein concept sector rose by 2.52%, ranking second among concept sectors, with 30 stocks increasing in value [1][2] - Notable gainers included Sangon Biotech, which hit the daily limit with a 20% increase, and other significant performers such as Sai Sheng Pharmaceutical, Jie Ya Co., and Jinbo Bio, which rose by 16.37%, 9.31%, and 9.17% respectively [1][2] - The sector experienced a net inflow of 221 million yuan from main funds, with 23 stocks receiving net inflows, and 8 stocks exceeding 10 million yuan in net inflow [2][3] Group 2 - Leading the net inflow was Xilong Scientific, which saw a net inflow of 242 million yuan, followed by Rejuve Pharmaceutical and Zexin Pharmaceutical with net inflows of 37.78 million yuan and 32.48 million yuan respectively [2][3] - The top three stocks by net inflow ratio were Xilong Scientific at 20.85%, Zexin Pharmaceutical at 8.53%, and Chengdu Xian Dao at 7.96% [3][4] - Stocks with notable declines included Furuida, Zhongyuan Xiehe, and Wanmei Biological, which fell by 2.25%, 1.92%, and 1.80% respectively [1][5]

Industry Overview - The recombinant protein sector has shown active performance, with a nearly 4% increase in the market as of May 20, highlighted by stocks such as Yipinhong (300723) and Weiming Pharmaceutical (002581) reaching their daily limit [1] - Recombinant proteins are produced using recombinant DNA or RNA technology, allowing host cells to express proteins that are either identical to or modified versions of natural proteins, enhancing properties like solubility or yield [1] - Key applications of recombinant proteins include biopharmaceuticals, cell immunotherapy, and diagnostic reagent development, playing a crucial role in vaccine production, monoclonal antibodies, and innovative drugs for cancer treatment, autoimmune diseases, and rare diseases [1] Market Growth - The global recombinant protein market grew from $7 billion in 2015 to $10.8 billion in 2020, with a compound annual growth rate (CAGR) of 9.0%, and is projected to reach $20.8 billion by 2025, with a CAGR of approximately 14.1% from 2020 to 2025 [2] - Historically, the global recombinant protein market has been dominated by international brands, but domestic companies are increasingly investing in R&D to enhance their technology and product quality, leading to a significant trend of import substitution [2] Company Highlights - Yipinhong has established a recombinant protein R&D and pilot production facility, enabling capabilities in biopharmaceutical development [3] - Weiming Pharmaceutical's subsidiary, Shandong Yandu, has developed a high-expression recombinant protein platform, creating multiple biopharmaceutical R&D systems [3] - Sangfor Biopharma focuses on innovative therapeutic antibody drugs, specializing in monoclonal antibodies, bispecific antibodies, and multifunctional recombinant proteins [3] - Kexing Pharmaceutical is a leading company in China's recombinant protein drug sector, with a comprehensive biopharmaceutical R&D innovation system [4] - Furuida has been deeply involved in the recombinant collagen field, utilizing synthetic biology techniques to select high-bioactive segments from human type III collagen [4] - Saiseng Pharmaceutical has formed a technical system centered on proteomics, antibody platforms, drug R&D, and fine recombinant protein production [4] - Jieya Co., Ltd. has partnered with Chuangjian Medical to establish Anhui Jiechuang Medical Equipment Co., Ltd., focusing on recombinant collagen protein business [4] - Shenzhou Cell has developed a high-efficiency, high-throughput technology platform covering the entire biopharmaceutical R&D and production chain, with a diverse pipeline of monoclonal antibodies, recombinant proteins, and vaccines [4]