Quest Diagnostics (QDIA) Shares Up 7% on Q4 Earnings Surge

Quest Diagnostics (QDIA) surged 7% in early trading on February 10, 2026, following a fourth-quarter report that showed an 11% increase in net profit to $193.8 million, driven by higher revenue and cost optimization. The company reported revenue of $2.42 billion for the quarter, up 4.2% year-over-year. CEO Dr. David J. Sorensen stated the improvement reflects strong demand for diagnostic testing and effective operational adjustments. The stock closed at $72.45, up from $67.75 at the start of the session.