Shares of Gartner Inc. (NYSE: IT) climbed 9.69% on September 15, 2026, closing at $196.99 as investors pushed the stock to its strongest single-session performance in recent weeks. The move lifted the company's market capitalization to $11.34 billion.
The daily gain extended a positive run for the stock across multiple timeframes. Over the prior seven days, Gartner shares had risen 5.74%, while the 30-day period reflected an 8.77% advance, indicating sustained buying interest heading into the session.
Gartner, which provides research and advisory services primarily to enterprise technology buyers and executives, has seen its stock build momentum across the near- and medium-term windows tracked in Tuesday's trading data.
With the 30-day gain at 8.77% and the single-day spike reaching 9.69%, Tuesday's close at $196.99 represents the high point of a consistent upward trajectory for the stock over the past month.
