Horizon Quantum Holdings is trading 5.4% down at $14.89 as broader risk-off selling pressured U.S. equities on September 23, 2026.
- The Nasdaq Composite fell 1.15%; the S&P 500 fell 0.73%.
- Higher Treasury yields, stronger economic data, and renewed inflation concerns weighed on growth-oriented valuations.
- After gains of 13.74% on September 21 and 2.21% on September 22, trading remains active in the open session. No clear company catalyst emerged; the latest official communication concerned share structure and lock-up details.