COHH is trading at $8.16 (-10.75%) in pre-market on August 18, 2026, apparently reflecting technical or liquidity-related factors rather than a confirmed sector or macro shock; no clear overnight negative catalyst was identified.
- COHH targets 200% of Coherent’s daily performance, so reversals can be amplified by leverage and volatile price action.
- Reports showed optical-communications shares, including Coherent, rising August 17, while U.S. S&P 500 futures were higher early August 18.