Lumentum Set to Join Nasdaq-100 Index

The optical networking components maker has seen substantial gains in its stock price in 2026. The company announced it will be added to the Nasdaq-100, an index that includes many of the largest non-financial companies listed on the Nasdaq exchange.

This change is expected to take effect in the coming weeks, according to MarketWatch. Lumentum's stock performance ranks fifth in the S&P 500 this year. The addition to the Nasdaq-100 often leads to increased investor attention and potential buying by index-tracking funds.

The company's shares have posted strong returns so far in 2026.

This performance places it ahead of most other members of the S&P 500 benchmark index. Inclusion in the Nasdaq-100 is determined by factors including market capitalization, liquidity and trading volume. Lumentum met the criteria based on its recent gains and overall standing in the market.

The move comes as technology and communications equipment sectors have seen renewed interest from investors. Lumentum supplies components used in fiber-optic networks and data centers.