Monolithic Power stock heads into the open after a steep drop

At the close on September 14, 2026, Monolithic Power stock fell sharply on the Nasdaq, ending the session down more than 6 percent, with trading volume elevated versus recent days as concerns over its role in Nvidia's next AI platform weighed on sentiment.

Monolithic Power stock closed at USD 1,158.70 on the Nasdaq on September 14, 2026, down about 6.1% for the day in a heavy session. Compared with the broader Nasdaq Composite, which rose roughly 1% to finish higher on the same date, the shares underperformed the tech benchmark by more than 7 percentage points.

September 14, 2026 in numbers

Monolithic Power Systems Inc. (ISIN US6098391054, Nasdaq: MPWR) saw its shares lose 75.76 dollars to end at USD 1,158.70 on September 14, 2026, with intraday trading between a high of USD 1,185.89 and a low of USD 1,156.00 per data aligned with the Nasdaq session. Daily volume reached 143,653 shares, signaling robust activity relative to typical turnover for the stock.

As TipRanks reported on September 14, 2026, the drop followed a note from Edgewater Research suggesting Monolithic Power could lose its supplier slot on Nvidia's next generation Blackwell AI GPU platform because of performance concerns in its components. In parallel, MSN highlighted Monolithic Power among semiconductor names retreating on the day, citing investor concern around future AI hardware demand. Despite the sector pressure, the Nasdaq Composite still rose about 1% to close at 26,333.04, so Monolithic Power's decline stood out against the positive index move.

Events to watch today

Today, September 15, 2026, investors continue to weigh the implications of potential changes in Nvidia's supplier lineup for upcoming AI GPUs, a theme that could keep attention on Monolithic Power Systems given its exposure to advanced power management chips. As TipRanks noted in the same report, the company remained up more than 36% year to date even after the pullback, so any further news on Nvidia's platform decisions or semiconductor demand could be relevant for today's session. Broader market sentiment around technology shares also matters after the Nasdaq's 1% gain on September 14, 2026, which contrasted with Monolithic Power's sharp slide and could influence how traders position ahead of the opening bell.