Infosys ADRs spiked 50% on Dec. 19, 2025, due to a data glitch mislabeling its ticker, triggering algorithmic trading chaos before reversing.

Infosys ADRs surged nearly 50% on December 19, 2025, reaching a peak of $30 amid extreme volatility and multiple trading halts, driven by a technical glitch involving a ticker-mapping error that misled algorithmic trading systems. The spike, which occurred without any company news or fundamental changes, was attributed to a data-feed anomaly where Infosys’s ticker (INFY) was incorrectly labeled as "American Noble Gas Inc" on some platforms, triggering a self-reinforcing buying frenzy. Low liquidity on a year-end Friday amplified the effect, with trading volume far exceeding normal levels. The rally quickly reversed, and ADRs closed up 5.7%, while Infosys’s Indian-listed shares rose only slightly. The incident highlighted systemic risks in automated trading, data integrity, and ADR market fragility, prompting regulatory review.