X-Energy is trading 4.7% down now at $15.56 amid heightened volatility around September 18 options expiration.
- The move reverses the 12.08% gain on September 17.
- Heavy September 20-strike straddle activity and speculative positioning are cited.
- No new company-specific negative announcement was identified on September 18; the recent UK reactor regulatory milestone remains a potentially supportive backdrop but does not directly explain the decline.