Why is London Stock Exchange stock rallying today?

LSEG stock surged nearly 3.0% today, reaching £9,048 during trading after the company disclosed impressive Q3 2026 trading updates and a significant acquisition. The full-year revenue growth forecast was raised to at least 8.0%, driven by robust performance and increased use of AI products. LSEG reported £2.407 billion in total income for the quarter, marking an 8.8% organic constant-currency growth.

Additionally, the company announced plans to acquire Octus for $3.535 billion in cash, aiming to strengthen its credit and private markets data presence, and Trumid for around $1.75 billion, seeking to become a global leader in fixed income data and trading. UBS maintained its Buy rating on the stock and kept the price target at 11,700 pence, suggesting substantial upside from current levels.

Despite the strong performance, analysts view LSEG as a "show-me" story, emphasizing the need for concrete evidence of profit contributions from AI activities. LSEG's CEO, David Schwimmer, highlighted record growth in Q3, driven by expanding subscription businesses and sustained strength in the Markets sector. The company is on track for its strongest annual growth since 2018, thanks to operational momentum, strategic M&A, and shareholder returns.

This surge propelled LSEG to become one of the highest FTSE 100 gainers, even as the broader UK index faced a softer session amid global macro pressures.