Four companies will join the S&P 500 index, according to announcements from S&P Dow Jones Indices. The new additions include Vertiv, Lumentum, Coherent, and EchoStar.

Vertiv Holdings Co. provides critical digital infrastructure and continuity solutions. The company specializes in power, cooling, and IT infrastructure solutions for data centers and other facilities.

Lumentum Holdings Inc. is a commercial laser and optical communications company that manufactures products for telecommunications, data center, and consumer electronics markets.

Coherent Corp. develops and manufactures laser-based technology and systems for scientific, commercial, and industrial applications across various sectors.

EchoStar Corporation operates as a connectivity company, providing broadband satellite technologies and services for enterprise and consumer customers. The company's inclusion in the S&P 500 reflects its position in the satellite communications industry.

Inclusion in the S&P 500 typically results in increased institutional investment as index funds purchase shares to match the benchmark. The timing of when these additions will take effect was not specified in the available information.