SiFive is a semiconductor company that designs and develops custom chips based on the RISC-V instruction set architecture. The company was founded in 2015 by a team of experts in computer architecture and chip design and is headquartered in San Mateo, California. SiFive's mission is to democratize access to custom silicon and enable innovation for all. The company has raised over $190 million in funding to date and has partnerships with several leading technology companies.