民生证券：给予长盈通买入评级

Core Viewpoint - Longyingtong's 1H25 net profit increased by 91.8% year-on-year, driven by significant growth in optical fiber components and strategic expansion into AI and big data sectors [2][5]. Financial Performance - 1H25 revenue reached 192 million yuan, up 40.4% year-on-year; net profit was 29 million yuan, up 91.8% year-on-year; and non-recurring net profit was 26 million yuan, up 203.0% year-on-year [2]. - In Q2 2025, revenue was 127 million yuan, a 58.7% increase year-on-year; net profit was 21 million yuan, up 140.9% year-on-year; and non-recurring net profit was 19 million yuan, up 245.7% year-on-year [2]. - 1H25 gross margin improved by 5.6 percentage points to 52.7%, and net margin increased by 4.3 percentage points to 15.3% [2]. Product Performance - Revenue from optical fiber components reached 110 million yuan, a 207.4% increase year-on-year; special optical fibers generated 40 million yuan, down 20.9% year-on-year; new materials contributed 10 million yuan, up 10.8% year-on-year; while optical device equipment and others generated 10 million yuan, down 47.6% year-on-year [3]. Strategic Initiatives - The company is focusing on high-growth sectors such as new generation information technology, new materials, new energy vehicles, and biomanufacturing, with three main growth curves: 1. "Sensing" for optical fiber gyroscopes and underwater acoustic solutions 2. "Power Transmission" for optical fiber laser upstream solutions 3. "Next Generation Optical Communication and Thermal Management" for AI big data solutions [3]. Research and Development - 1H25 period expense ratio decreased by 3.2 percentage points to 32.1%, with sales expense ratio down 1.4 percentage points to 4.4%, and management expense ratio down 2.5 percentage points to 17.7%; R&D expense ratio increased slightly by 0.1 percentage points to 9.5% [4]. - As of Q2 2025, accounts receivable and notes totaled 460 million yuan, up 13.3% from the beginning of the year; prepaid expenses increased by 163.9% to 10 million yuan; inventory rose by 31.0% to 100 million yuan; and contract liabilities increased by 135.6% to 3 million yuan [4]. Investment Outlook - The company is recognized as a national-level specialized and innovative "little giant" enterprise, with a solid foundation for future expansion in big data, AI, and high bandwidth sectors. Projected net profits for 2025, 2026, and 2027 are 67 million yuan, 126 million yuan, and 200 million yuan, respectively, with corresponding PE ratios of 90x, 48x, and 30x [5].