Monolithic Power Systems (MPWR) Stock: What to Know Before the Dec. 22, 2025 Market Open
Monolithic Power Systems will join the Nasdaq-100 before the U.S. market opens on Monday, Dec. 22, 2025. The stock closed near $937 on Dec. 19, up 0.8%, with a market cap around $44 billion. Index inclusion is expected to trigger heavy trading as funds rebalance. MPWR also announced a new quarterly dividend and has seen analyst target changes ahead of the event.