SJ Investment Partners
Samsung Building, 11th Floor (Daechi-dong) 7, Samseong-ro 86-gil, Gangnam-gu, Seoul, Seoul-t'ukpyolsi, 06178, South Korea
Overview
SJ Investment Partners is a venture capital firm that invests in the IT and biotechnology industries.
- Total investments
- 14
- Lead investments
- 1
- Investments · 12mo
- 3
- Active investors
- 3
Sector focus
- Business Development
- Financial Services
- Venture Capital
Investment portfolio
- BEI
Participated · Series B · Aug 2026
BEI develops and manufactures anode-free lithium metal batteries designed for high energy density and power; its current-generation cells exceed 500 Wh/kg according to the company. Independent testing by About:Energy confirmed leading energy density and power characteristics, and a BEI-powered drone demonstrated over 30 minutes of flight at −26°C during a field demo in Finland. BEI reports more than 30 global UAV customers are evaluating or deploying its cells, which are already integrated into operational small unmanned systems. The company is commercially shipping its AFLMB cells today while advancing a roadmap targeting future cell generations with energy densities above 600 Wh/kg. With the Series B proceeds, BEI plans to scale manufacturing, run customer qualification programs, and expand commercially across Korea, the U.S., and Europe. Strategic partnerships and investor relationships aim to strengthen supply-chain resilience and support adoption in defense, robotics, and electric mobility markets.
- Dnotitia
Participated · Series A · Apr 2026
Dnotitia develops an AI storage stack centered on Seahorse, a vector database, and VDPU, a dedicated vector data processing semiconductor. In March the company unveiled an AI Storage Strategy to integrate external knowledge, long-term memory, and working memory. Seahorse received Korea’s top-grade GS software certification in January and Seahorse Cloud was launched as a SaaS offering in March. Dnotitia describes VDPU as a purpose-built chip for accelerating vector data search and processing and is preparing it for commercialization. The company plans to use its recent Series A proceeds to improve cloud and on‑premises products, commercialize VDPU, expand globally, and hire key talent. Dnotitia is also moving forward with IPO preparations, naming Korea Investment & Securities and Shinhan Securities as joint lead managers.
- PineTree Therapeutics
Participated · Series B · Oct 2025
Founded in 2019, PineTree Therapeutics is building AbReptor™, a proprietary platform that creates modular bispecific and multispecific degraders capable of eliminating membrane-bound and extracellular proteins that drive tumor growth and therapeutic resistance. The technology has shown strong preclinical efficacy and safety against receptor tyrosine kinases, including those refractory to existing TKIs and immune checkpoint inhibitors. Beyond oncology, the company believes its degraders may provide new approaches for inflammatory and immunology indications. PineTree is also exploring a novel class of degrading antibody–drug conjugates and trispecific degraders to enhance durability and tolerability. In July 2024 it inked an AstraZeneca collaboration that carries more than $500 million in potential milestones and royalties around its preclinical EGFR degrader. Proceeds from its recent Series B financing will fund IND-enabling work, first-in-human studies, and expansion of its degrader portfolio, while supporting additional strategic collaborations. The company remains pre-revenue and has not yet entered clinical trials, putting near-term emphasis on advancing lead candidates into Phase I.
- VESSL AI
Participated · Series A · Oct 2024
VESSL AI provides an MLOps platform that automates model training, real-time deployment, pipelines, and GPU cluster optimization. The platform targets companies building custom large language models and vertical AI agents, and emphasizes a hybrid multi-cloud approach using spot instances to reduce GPU expenses by up to 80%. VESSL offers four main features: VESSL Run, VESSL Serve, VESSL Pipelines, and VESSL Cluster. The company has over 2,000 users and 50 enterprise customers, including Hyundai, LIG Nex1, TMAP Mobility, Yanolja, Upstage, ScatterLab and Wrtn.ai. It has strategic partnerships with Oracle and Google Cloud in the U.S. and operates with about 35 staff across South Korea and a San Mateo office. The startup was founded in 2020 and will use the new funding to accelerate development of its infrastructure.
- Poen
Participated · Series B · Jul 2024
POEN develops technology to select and remanufacture reusable cells from used electric-vehicle batteries and assembles remanufactured battery modules and packs. The company has built an EV battery value-chain platform in partnership with major industry players including Hyundai Motor, Kia, LG Energy Solution, SK ON, and CATL. POEN plans to accelerate development and commercialization of battery modules and packs and to expand its global presence supplying remanufactured batteries to key markets. It has established subsidiaries in the United States and Germany and positions itself as a leader in eco-friendly battery recycling and resource recovery. The company has received industry recognition including a CES Innovation Award and the ‘Best Innovation Award for Used Batteries’ at InterBattery. Since its founding in 2019, POEN has raised a total of 46.7 billion KRW to date.
Team
Oh Seok Joon
Executive
Sangmin Kim
Executive director
Ok Jin-woo
director