Supply chain solutions start-up O4S Thursday said it has raised USD 2.1 million (about Rs 14.3 crore) in pre-series A funding, led by Venture Highway to expand its operations in India. The three-year-old start-up has raised a total of USD 2.5 million so far, including a seed investment of USD 400,000 in 2017, a statement said. The new funding will be used to strengthen its workforce, accelerate client acquisition and build technology infrastructure across industries within India, it added. O4S focuses on industries like agriculture, fast-moving consumer goods, pharmaceuticals and personal care products.