Lightmatter, which uses silicon photonics with waveguides instead of wires in chips, raised a $400M Series D led by T. Rowe Price at a $4.4B valuation (Rachel Metz/Bloomberg)

Rachel Metz / Bloomberg: Lightmatter, which uses silicon photonics with waveguides instead of wires in chips, raised a $400M Series D led by T. Rowe Price at a $4.4B valuation  —  Investors put $400 million into the company, which aims to make it faster to build new AI software.

Lightmatter, which uses silicon photonics with waveguides instead of wires in chips, raised a $400M Series D led by T. Rowe Price at a $4.4B valuation (Rachel Metz/Bloomberg)
Rachel Metz / Bloomberg: Lightmatter, which uses silicon photonics with waveguides instead of wires in chips, raised a $400M Series D led by T. Rowe Price at a $4.4B valuation  —  Investors put $400 million into the company, which aims to make it faster to build new AI software.