Historical pre-market losers from Tuesday, August 18, 2026. 50 stocks declined in pre-market trading. Biggest decliner: Coherent Corp. (COHR) at -6.94%.
Pre-market losers are stocks experiencing the largest price drops between 4:00 AM and 9:30 AM ET. These moves are often triggered by earnings misses, guidance cuts, analyst downgrades, or negative macro developments. Low pre-market volume can amplify these moves beyond what regular-session trading would produce.
Significant pre-market declines can present either warning signs or buying opportunities depending on the catalyst. Cross-reference with the earnings calendar and individual stock analysis pages for deeper context.
| Ticker | Company | Sector | Price | % Change |
|---|---|---|---|---|
| COHR | Coherent Corp. | Technology | $326.85 | -6.94% |
| WDC | Western Digital Corp. | Technology | $499.01 | -6.90% |
| LITE | Lumentum Holdings Inc. Common Stock | Technology | $903.40 | -6.76% |
| ASX | ASE Technology Holding Co., Ltd. | Other | $37.25 | -6.66% |
| GLW | Corning Incorporated | Technology | $161.69 | -6.65% |
| STX | Seagate Technology Holdings PLC Ordinary Shares (Ireland) | Technology | $930.00 | -6.51% |
| MRVL | Marvell Technology, Inc. Common Stock | Technology | $219.28 | -6.42% |
| SNDK | Sandisk Corporation Common Stock | Technology | $1677.06 | -6.14% |
| SKHY | SK hynix Inc. American Depositary Shares | Other | $161.23 | -5.92% |
| TER | Teradyne, Inc. Common Stock | Technology | $418.55 | -5.55% |
| MU | Micron Technology, Inc. | Technology | $959.83 | -5.13% |
| LRCX | Lam Research Corp | Technology | $326.39 | -5.08% |
| IONQ | IonQ, Inc. | Technology | $44.50 | -5.00% |
| AMAT | Applied Materials Inc | Technology | $508.62 | -4.99% |
| CIEN | Ciena Corporation | Technology | $423.39 | -4.89% |
| KLAC | KLA Corporation Common Stock | Technology | $195.80 | -4.84% |
| ARM | Arm Holdings plc American Depositary Shares | Other | $258.62 | -4.72% |
| INTC | Intel Corp | Technology | $98.87 | -4.46% |
| MPWR | Monolithic Power Systems, Inc. | Technology | $1356.00 | -4.24% |
| PATH | UiPath, Inc. | Technology | $15.33 | -4.14% |
| CRWV | CoreWeave, Inc. Class A Common Stock | Technology | $101.71 | -4.05% |
| FIX | Comfort Systems USA, Inc. | Industrials | $1806.00 | -4.00% |
| VRT | Vertiv Holdings Co Class A Common Stock | Technology | $280.79 | -3.98% |
| ASML | ASML Holding NV | Technology | $1808.44 | -3.97% |
| APPS | Digital Turbine, Inc. | Financial Services | $11.78 | -3.76% |
| AMD | Advanced Micro Devices | Technology | $487.50 | -3.66% |
| NOK | Nokia Corporation | Other | $10.39 | -3.62% |
| SMCI | Super Micro Computer, Inc. Common Stock | Technology | $36.91 | -3.58% |
| Q | Qnity Electronics, Inc. | Technology | $135.79 | -3.53% |
| ON | ON Semiconductor Corp | Technology | $80.50 | -3.45% |
| ANET | Arista Networks | Technology | $194.89 | -3.42% |
| PODC | PodcastOne, Inc. Common Stock | Technology | $2.83 | -3.40% |
| CRML | Critical Metals Corp. Ordinary Shares | Other | $6.35 | -3.35% |
| UEC | Uranium Energy Corp. | Basic Materials | $10.80 | -3.31% |
| APH | Amphenol Corporation | Technology | $165.56 | -3.11% |
| HPE | Hewlett Packard Enterprise Company | Technology | $55.85 | -3.06% |
| ETN | Eaton Corporation, plc Ordinary Shares | Industrials | $441.50 | -3.05% |
| MCHP | Microchip Technology Inc | Technology | $77.82 | -3.05% |
| JBL | Jabil Inc. | Technology | $358.75 | -3.01% |
| GEV | GE Vernova Inc. | Industrials | $1047.11 | -2.96% |
| NCLH | Norwegian Cruise Line Holdings Ltd. Ordinary Shares | Cons Cyclical | $17.65 | -2.92% |
| SPCX | Space Exploration Technologies Corp. Class A Common Stock | Technology | $142.00 | -2.89% |
| TSM | Taiwan Semiconductor Manufacturing Company Ltd. | Technology | $418.73 | -2.84% |
| QCOM | Qualcomm Inc | Technology | $157.81 | -2.69% |
| ORCL | Oracle Corp | Technology | $142.70 | -2.69% |
| JCI | Johnson Controls International plc | Industrials | $149.80 | -2.68% |
| UPST | Upstart Holdings, Inc. Common stock | Technology | $28.97 | -2.62% |
| CRCL | Circle Internet Group, Inc. | Financial Services | $72.63 | -2.62% |
| BBCP | Concrete Pumping Holdings, Inc. Common Stock | Industrials | $9.35 | -2.60% |
| GNRC | GENERAC HOLDINGS INC | Industrials | $215.50 | -2.60% |