STMicroelectronics stock heads into the open after a 4.2% slide

At the close on September 17, 2026, STMicroelectronics stock finished at EUR 37.80 on Euronext Paris, down 4.2 percent from the previous session. The move contrasted with gains across global chip names, leaving the stock lagging sector indices on the day.

September 17, 2026 in numbers

STMicroelectronics N.V. (ISIN NL0000226223) closed at EUR 37.80 on Euronext Paris on September 17, 2026, after trading between an intraday low of EUR 37.40 and a high of EUR 39.50. The daily change of minus 4.2 percent followed a prior close of EUR 39.50, with volumes in line with recent averages per exchange data. The closing level left the shares several percent below their recent local high, even as the Philadelphia Semiconductor Index advanced more than 3 percent that day according to Kookmin Ilbo.

As Teleborsa reported on September 17, 2026, Equita revised its target price on STMicroelectronics to EUR 63 from EUR 66 per share, citing the impact of interest rates while keeping a buy recommendation ahead of upcoming earnings. That adjustment, paired with a strong rebound in US semiconductor benchmarks highlighted by Sina, framed the relative underperformance of the shares compared with the broader chip sector on September 17, 2026.

Outlook for today

Today, September 18, 2026, STMicroelectronics is due to remain in focus as investors digest the recent analyst target revision and position ahead of its next earnings release, which market participants expect within the current reporting cycle according to Teleborsa. Broader sentiment for chip makers may take cues from the strong close in US semiconductor names on September 17, 2026, when major US indices and the sector rallied together as described by The Straits Times. With that backdrop, today's session will show whether STMicroelectronics can close some of the performance gap to its sector peers without any confirmed company-specific release early in the day.