Soitec Shares Plunge Nearly 8% and End as the Worst Performer in the SBF 120
The Isère-based semiconductor substrate specialist opens the session with a sharp correction and closes as the laggard of the broad Paris index. This movement extends a challenging month marked by high volatility and a series of analyst revisions. The decline is part of a semiconductor sector that is also under pressure in Paris.
Soitec Plunges Nearly 8% and Finishes at the Bottom of the SBF 120
Soitec drops 7.88% to €119.25 at the opening, at the bottom of the SBF 120 which falls by 0.91%. STMicroelectronics loses 6.21% at the same time, indicating significant pressure on the entire Parisian semiconductor sector. The decline brings the weekly performance to -14.09% and the monthly drop to nearly 33%, after an otherwise exceptional spring: over three months, the stock still shows a gain of 130.4%.
The bullish sequence documented in May (peak at €200.50 on May 29 after a 20% surge following the annual earnings release) thus gradually gives way to a phase of substantial profit-taking. The VIX jumps simultaneously from 16.78 to 20.19, an increase of 20.32%, in a climate of coordinated tightening by major central banks and a resurgence of geopolitical tensions around the Strait of Hormuz.
Break of Short-Term Moving Averages and Test of the €116.50 Support
The price significantly drops below its short-term moving averages: the MM20 at €145.24 is now 21.79% above the current price, and the MM50 at €135.77 is also distancing (gap of 12.17%). The MM200 remains far below, at €61.31, reflecting the magnitude of the rally accumulated since the beginning of the year. The stock is approaching the identified support at €116.50, whose potential break could pave the way for a test of the spring lows.
The RSI at 47 remains neutral, indicating that the day's decline has not yet generated an extreme oversold configuration despite the severity of the movement. During the annual earnings release for 2026 on May 27, the company had pointed out among its risks the correction of inventories at its RF-SOI clients and the pressure on profitability linked to production cuts, issues that remain central to the debate on valuation after the spring's quadrupling.
