A market-capitalization-weighted index of 500 large US publicly traded companies, widely used as the primary benchmark for US large-cap equity performance.
Nasdaq Composite fell 2.14% on Friday and about 4.5% on the week, its worst since June, as investors doubted AI-linked debt, CNN reported. CoreWeave, a GPU renter with tens of billions in debt, saw bond yields rise to distress levels.
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US stocks had their worst day since July on October 14, the Nasdaq down 1.9% and the S&P 500 down 1.1%, after September CPI hit 3.7% against 3.6% expected. That was the S&P 500's fifth loss in six sessions since its record, so the print hit a market already selling.
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Voss Capital's Value Fund returned 22.4% net in Q2 2026, 0.9 points ahead of the Russell 2000's 21.5%. With the master fund 100.6% delta-adjusted net long on June 30, we think the small-cap tape explains most of that gain.
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Bristlemoon Global Fund lost 8.4% in the September 2026 quarter, net of fees, though ASML, Sandisk and Lam Research helped in September. Its manager blames a narrow market, with the S&P 500 2% off its high and 83% of members more than 10% off theirs.
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Foreign Affairs says roughly 30% of Americans use AI less than four years after ChatGPT, five times the share for earlier technologies at comparable stages. The essay treats that speed as fuel for a market bubble, pointing to ten AI stocks that supplied around half of this year's S&P 500 returns.
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Greenlight Capital lost 4.3% in Q2 against a 15.2% gain for the S&P 500, and is up 1.9% for 2026 versus 10.2% for the index. The year-to-date gap is 8.3 points against 19.5 for the quarter, so the first quarter went Greenlight's way.
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The FT's Katie Martin says the S&P 500 without its AI component has fallen 7% since the end of August while the index itself hit a record. On her account, stocks, real estate and infrastructure are one AI position under different labels.
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JPMorgan, Goldman Sachs and Citi report Tuesday, then inflation data lands Wednesday and Thursday. Per CNBC, FactSet has S&P 500 third-quarter earnings on track for 29.6% growth, and the open question is executives' tone on fuel and borrowing costs.
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In 2026 proxy filings, the median CEO was paid $17.5 million in the S&P 500 and $7.1 million in the Russell 3000, up 6% and 7% on a year earlier. Equity carries most of the growth since 2021. The report puts investor scrutiny on exceptional awards, above-target payouts and executive security.
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Asian shares opened cautiously on Monday, with Brent down 1.1% at $103.50 a barrel, ahead of major US bank earnings on Tuesday. US inflation data due this week may weigh on tech valuations as much as the results do.
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Microsoft, Nvidia, Apple and Meta added roughly 300 S&P 500 points in Q3, over 200% of the index gain, Citadel Securities commentary says. Holders of a cap-weighted fund own those weights automatically, so 500 names diversify less than the count implies.
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Five bond ETFs took in $24.89 billion in the month to Oct. 8, level with the $24.88 billion that went into two S&P 500 funds, according to Koscom data. Most of the bond money went to aggregate and municipal funds that lost between 2% and 3.3%, so investors are buying duration alongside stocks priced at 19 times forward earnings.
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Families headed by someone 75 or older are now America's wealthiest age group, the Federal Reserve's 2025 Survey of Consumer Finances found. That cohort is also the smallest by household count, CBS News reported, so the most wealth per household sits where there are the fewest customers.
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S&P 500's bull market turns four on October 12 with a 117% gain, the sixth-best since World War Two. Its next leg depends on whether a few AI-heavy companies, now a far larger share of the index, can show their data-center spending pays.
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LSEG expects US chipmakers' third-quarter profit growth to slow to about 136% from 158% while S&P 500 earnings rise about 31%. Analysts have raised that quarter's forecast at half their earlier pace since July, so the AI earnings carrying the index are losing speed.
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Four Korea-listed U.S. index ETFs took in 2.019 trillion won in the month to Oct. 7, ETF CHECK data show. A stronger won left the hedged version of TIGER's S&P 500 fund 10.67 points ahead of its unhedged twin over three months, so choosing a share class is now a call on the won.
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Microsoft, Nvidia, Apple and Meta added about 300 points to the S&P 500 in the third quarter while the other members subtracted about 150. With roughly 311 stocks down, most of an index fund's money sat in the group that lost ground.
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US stock futures slid from record highs on Wednesday and Thursday as oil rose and the 10-year Treasury yield sat between 5.28% and 5.33%. With FactSet expecting 29.5% third-quarter earnings growth, how far the rally runs now depends on whether oil keeps pushing bond yields up.
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Unconfirmed reports of a 90-day tariff pause, carried by CNBC and Reuters, swung US stocks about $2.4 trillion in ten minutes on April 7, 2025. As firms give AI agents authority to trade on news, the rules for acting on unconfirmed claims become part of the product.
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New York's comptroller says Wall Street earned $45.9 billion before tax in the first half, up 51.3%, and could top $90 billion for the year. Pay spending rose 18.8% over the same months, Seoul Economic Daily reported, so a second record bonus year looks likely if deal fees hold.
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