Group 1 - The US software sector saw a rebound led by companies partnering with AI startup Anthropic, following a previous decline due to concerns over AI's disruptive impact [1][3] - Anthropic is developing a new tool called "plugins" for applications in investment banking, wealth management, and human resources, including transaction review and portfolio analysis [1][3] - Partner companies such as London Stock Exchange Group (LSEG), FactSet, Salesforce's Slack, and DocuSign experienced stock price increases ranging from 0.4% to 5.3% [1][3] Group 2 - The S&P 500 Software and Services Index rose by 1.4%, while the iShares Expanded Tech Software Sector ETF surged by 2.4% [4] - A report from Citrini Research predicted that AI will rapidly replace software and delivery applications, potentially leading to layoffs and an unemployment rate increase to 10.2% [4] - Market strategist Dennis Dick noted that software stocks, particularly IGV, have been severely oversold, and the market has largely absorbed the impact of any disruptive news [5][6] Group 3 - Anthropic's Claude Code tool was announced to upgrade legacy programming languages on IBM systems, resulting in IBM's stock experiencing its largest single-day drop in over 25 years [2][6] - Tax software company Intuit and AI solutions provider Intapp both saw stock increases of 2.8% and 7.1%, respectively, after announcing partnerships with Anthropic [2][6]