--- format: "aidr-story-markdown/v1" id: "249d3c3d628052e646b4e5d354d8cc74a223c63e802b9ae8e54e112f962b8402" canonical_url: "https://aidr.today/249d3c3d?lang=en" title: "AI Stock Basket Underperforms S&P 500 by 22% in Record Relative Decline" lang: "en" requested_lang: "en" available_langs: ["en","vi"] translation_fallback: null fallback_fields: [] published_at: "2026-10-27T16:24:23.000Z" category: "Industry" topics: [] source_urls: ["https://marketbrief.now/us-markets/ai-stock-basket-underperforms-sandp-500-by-22percent-in-record-relative-49cf8e2a","https://huggingnews.com/us-markets/ai-stock-basket-underperforms-sandp-500-by-22percent-in-record-relative-49cf8e2a"] summary: "A basket of AI stocks trailed the S&P 500 excluding those names by 22% over the last two weeks, marking the largest relative underperformance for the sector on record. The decline was driven by broad hedge fund liquidations, including a de-grossing event on Oct 22 that ranked as the 5th-largest of 2026 and the most substantial episode of long sales since September 2025. The slump brings the total drawdown for the AI basket since June to 28%, erasing nearly all of the 100% year-to-date gains it had posted by the end of June." --- # AI Stock Basket Underperforms S&P 500 by 22% in Record Relative Decline > [Open the canonical story]() **Published:** 2026-10-27T16:24:23.000Z **Category:** Industry ## Summary A basket of AI stocks trailed the S&P 500 excluding those names by 22% over the last two weeks, marking the largest relative underperformance for the sector on record\. The decline was driven by broad hedge fund liquidations, including a de\-grossing event on Oct 22 that ranked as the 5th\-largest of 2026 and the most substantial episode of long sales since September 2025\. The slump brings the total drawdown for the AI basket since June to 28%, erasing nearly all of the 100% year\-to\-date gains it had posted by the end of June\. ## Sources - [Story source]() - [Story source]()