Stock futures inched higher in the premarket hours of Monday as traders entered the final full trading week before the Christmas holidays.
Here are some of Monday’s biggest stock movers:
Biggest stock losers
- iRobot (IRBT) -81% – Shares collapsed after the Roomba maker filed for Chapter 11 bankruptcy protection in Delaware under a prepackaged restructuring that will hand control to its primary manufacturer, Picea Robotics, following mounting pressure from cheaper Chinese rivals such as Ecovacs and the impact of new U.S. tariffs, including a 46% levy on imports from Vietnam that added about $23M in costs in 2025; despite generating roughly $682M in revenue in 2024, profitability continued to deteriorate and the company had flagged going-concern risks as early as March 2025, with management expecting to complete the restructuring by February 2026, saying the deal is aimed at stabilizing operations and supporting future innovation by combining iRobot’s design and R&D with Picea’s manufacturing expertise.
- Sanofi (SNY) -3% – Shares fell after the French drugmaker said its Phase 3 PERSEUS trial showed that tolebrutinib failed to meet the primary endpoint of delaying six-month confirmed disability progression in patients with primary progressive multiple sclerosis, prompting the company to halt plans to seek regulatory approval for the drug in PPMS; Sanofi added that the safety profile was consistent with earlier studies, while EVP and Head of R&D Houman Ashrafian said the results were disappointing but would help improve understanding of multiple sclerosis disease biology.
- ServiceNow (NOW) -3% and Adobe (ADBE) -2% – Shares of both software firms slipped after KeyBanc downgraded them to Underweight from Sector Weight, citing rising competitive pressure from AI tools. Analysts led by Jackson Ader warned that the “death of SaaS” narrative could start to catch up with ServiceNow as IT back-office hiring slows and demand for headcount has yet to bottom, while its AI Agent Orchestrator may struggle to compete with Microsoft’s Agent 365. KeyBanc also flagged lingering risks around government budget scrutiny. On Adobe, KeyBanc said it sees limited avenues for outperformance in 2026 as the company faces a multi-front battle against traditional competitors, AI-native startups, and large language model developers. The firm added that well-funded rivals are innovating at a pace difficult for Adobe to match and set a price target of $310.