Coherent Shares Soar 4.3% on $510M Trading Volume Surge, Ranking 217th in U.S. Equities
Coherent (COHR) surged 4.30% on Sept. 10, 2025, with a trading volume of $510 million—up 87.9% from the previous day—ranking it 217th among U.S. equities. The laser technology firm’s shares saw heightened liquidity amid sector-specific market dynamics.
Analysts attributed the rally to renewed institutional interest in photonics and semiconductor-related equities, driven by speculative positioning ahead of upcoming earnings reports. A recent regulatory filing highlighted supply chain restructuring efforts, which traders interpreted as a potential catalyst for long-term operational efficiency. However, sector-wide volatility persisted due to macroeconomic uncertainty, tempering near-term optimism.
To set up and run this back-test accurately, I need to confirm a few practical details that were not specified in your request: 1. Stock universeUPC-- • Do you want all U.S. exchange-listed common stocks, or a specific index (e.g., Russell 3000, S&P 500, etcETC--.)? 2. Trade execution assumptions • After ranking stocks by yesterday’s trading volume, should the portfolio be entered at the next day’s open and exited at the following day’s open (open-to-open), or would you prefer close-to-close, or another convention? • Should positions be equally weighted across the 500 names each day? 3. Transaction costs & slippage • Should we incorporate an estimate for commissions and market impact? If you don’t have a view, I can apply a reasonable default (e.g., 2 bps per side). Once I have these details, I can pull the required data (daily volume and prices) and run the back-test from 1 Jan 2022 through today.

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