BREAKING: The S&P 500 erases all losses and turns green on the day. https://t.co/fkGl6UUirr
This Statista infographic (Q1 2025) charts the top negative contributors to the S&P 500’s total return—showing how a handful of large tech names dragged the index down. The inset notes the S&P was -4.30% for Q1 but would have been +0.50% excluding the ‘Magnificent 7’, directly illustrating how swings in a few stocks can flip the index from red to green.
Source: Statista
Research Brief
What our analysis found
On February 17, 2026, the S&P 500 staged a dramatic intraday reversal that captured widespread attention across financial media. The index dropped as much as 1.5% at its session lows before mounting a sharp rally that erased all losses. By the close, the S&P 500 finished up 0.11% at 6,843.51, gaining approximately 7.34 points on the day, according to Reuters market data. The Kobeissi Letter, a prominent market commentary account, reported that the index added roughly $600 billion in market capitalization in just 30 minutes during the reversal — a figure that was widely reposted by outlets including InvestX and BeInCrypto.
The $600 billion estimate is grounded in the S&P 500's aggregate market capitalization, which stood in the $61 trillion to $62 trillion range in early 2026. At that scale, a 1.0% swing equates to roughly $610 billion, making the figure arithmetically plausible if the rebound within the cited 30-minute window approached that magnitude. However, no independent minute-by-minute market-cap data feed has been publicly cited to confirm the precise dollar figure, and the calculation depends heavily on which time window and baseline are used.
The episode fits a broader pattern of elevated intraday volatility during this period. Analysts tied the swings to geopolitical uncertainty in the Middle East and ongoing rotation related to artificial intelligence stocks. The Kobeissi Letter subsequently reported even larger intraday swings in later sessions, including a claimed $3 trillion total swing on March 23, 2026, linked to rapidly shifting geopolitical headlines — underscoring how common such dramatic market reversals had become in early 2026.
Fact Check
Evidence from both sides
Supporting Evidence
Reuters confirms the intraday reversal
An independent Reuters market report for February 17, 2026, confirms the S&P 500 dropped as much as 1.5% at its session lows before rebounding to close up 0.11% at 6,843.51, directly corroborating the claim that the index erased all losses and turned green on the day.
Closing data matches the claim
The S&P 500 finished the session with a gain of approximately 7.34 points, meaning it ended in positive territory after being significantly lower earlier — precisely what the tweet described.
Market-cap math supports the $600 billion figure
With the S&P 500's aggregate market capitalization near $61 trillion in early 2026, a roughly 1% swing would equate to approximately $610 billion, making the reported $600 billion gain within a rapid rebound arithmetically consistent.
Multiple outlets corroborated the narrative
Financial news sites including InvestX and BeInCrypto independently reported on the intraday reversal, republishing the Kobeissi Letter's account and describing the rapid recovery from session lows.
Contradicting Evidence
The $600 billion figure lacks independent minute-level verification
While the number is arithmetically plausible, no publicly available primary data source or exchange-level minute-by-minute market-cap feed has been cited to confirm that exactly $600 billion was added in precisely 30 minutes. Outlets that repeated the figure were quoting the Kobeissi Letter rather than conducting independent calculations.
Smaller rebound estimates challenge the headline number
Some analyses described the intraday rebound as approximately 0.58% from the session low to the close, which on a $61 trillion base would translate to roughly $350 billion to $370 billion — significantly less than the claimed $600 billion. The discrepancy depends on whether the measurement covers the full low-to-close move or a specific 30-minute window.
Methodological limitations in converting index moves to dollar values
Translating a percentage index move into a dollar market-cap figure assumes a roughly uniform proportional change across all 500 constituent stocks. In reality, intraday variations in liquidity, differing stock-level moves, and market-cap weighting make such conversions approximations rather than precise measurements.
Pattern of large headline estimates from the same source
The Kobeissi Letter has a track record of citing very large dollar-denominated intraday swings, including a reported $3 trillion swing on March 23, 2026, suggesting these dramatic figures are a recurring editorial choice that may prioritize impact over methodological precision.
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