Group 1 - The AI investment grade borrowing has surged, with $75 billion of U.S. investment grade debt issued by AI-focused Big Tech in September and October, more than double the average annual issuance of $32 billion from 2015 to 2024 [3][4] - Major contributions to this total include $30 billion from Meta and $18 billion from Oracle, with additional borrowing from Alphabet, indicating a significant trend in AI-related debt issuance [4] - AI-linked companies now account for 14% of JP Morgan's investment grade index, surpassing U.S. banks as the dominant sector, highlighting the growing importance of AI in the credit market [5] Group 2 - Oracle's shares have increased by 54% in 2025, marking its strongest annual rally since 1999, driven by AI-related revenue growth, yet concerns about rising credit default swaps indicate investor anxiety over its debt levels [6] - The emergence of AI-related "junk" bonds is notable, with TeraWulf issuing a $3.2 billion high-yield bond rated BB- and CoreWeave issuing $2 billion in high-yield bonds, reflecting the increasing risk appetite in the market [7]