Lumentum Joining Nasdaq-100 Index with Effective Date May 18, 2026

Lumentum Holdings Inc. will replace CoStar Group, Inc. in the Nasdaq-100 Index on May 18, 2026. The change will impact over 200 investment products with $600 billion in assets under management. This marks a significant shift in market presence for Lumentum, with its stock surging 339% since 2025.

Lumentum Holdings Inc. (LITE) is set to join the Nasdaq-100 Index, a group of the largest Nasdaq-listed non-financial companies . Effective May 18, 2026, Lumentum will replace CoStar Group, Inc. (CSGP) as a component of the index. This change reflects a major milestone for Lumentum, which has experienced significant growth with its stock price rising by 339% since 2025.

The Nasdaq-100 Index is closely watched by investors due to its broad market impact. More than 200 investment products with approximately $600 billion in assets under management track this index . Lumentum's addition will likely influence these products and attract investor attention.

While there are no details about the reasoning behind this move, market analysts will be watching for Lumentum's performance in the index. With its rapid stock growth, the company's inclusion may signal its potential for continued market success.

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