Tiansu Measurement submitted an IPO registration to the Shenzhen Stock Exchange, specializing in third-party measurement and testing services.

On October 23, Shenzhen Tiansu Metrology Testing Co., Ltd. (referred to as Tiansu Metrology) applied for a change in the status of the IPO review by the Shenzhen Stock Exchange's ChiNext board to "registration submitted". CMSC is its sponsoring institution, and it plans to raise 423.9 million yuan. The prospectus shows that Tiansu Metrology is a national comprehensive independent third-party metrology testing service organization, with its main business being metrology calibration, testing, certification, and other professional technical services. Its clients cover multiple sectors of the national economy including biomedicine, automotive, new energy, rail transportation, energy and power, light industry, daily chemicals, and equipment manufacturing. As of the end of June 2025, the company has developed and perfected a total of 1,417 calibration services in ten major metrology calibration fields including geometry, thermodynamics, mechanics, electromagnetics, radio, time and frequency, acoustics, optics, chemistry, and ionizing radiation, as well as comprehensive specialized measuring instruments, and has further developed consumer battery, power battery, and energy storage battery testing business. The company has established grid-like metrology calibration and testing laboratories in various regions such as Guangdong, Guangxi, Yunnan, Hunan, Hubei, Jiangsu, Henan, Shanxi, Shaanxi, and Xinjiang, and has obtained accreditation from the China National Accreditation Service for Conformity Assessment (CNAS) and qualification accreditation for testing and inspection institutions (CMA). According to statistics from the State Administration for Market Regulation, the total revenue of metrology calibration institutions in 2024 was 11.604 billion yuan, and the company still has a 5.91% market share in a highly fragmented market. The funds raised in this offering are planned to be invested in the following projects: In terms of finances, in the fiscal years 2022, 2023, 2024, and the first half of 2025, Tiansu Metrology achieved operating revenues of approximately 597 million yuan, 726 million yuan, 800 million yuan, and 409 million yuan respectively. During the same period, the company achieved net profits of approximately 84.3854 million yuan, 101 million yuan, 111 million yuan, and 55.5762 million yuan respectively.