A big company falling 10% in a day used to be rare. This year: 25 times, a record
Among the 88 companies in today's S&P 100 that have traded since 2010, a one-day fall of 10% or more on a day the market held up happened about 9 times a year from 2010 to 2023. It happened 22 times in 2024, 21 times in 2025 and 25 times so far in 2026. The biggest this year: IBM -25.2%, Intuit -20.0%, UnitedHealth -19.6%, Accenture -18.0%. These were not crash days: each was one company repricing on one quarter or one forecast.
Each bar is one year: how many times a company in today's S&P 100 lost 10% or more of its value in a single day, counting only the companies that have traded since 2010 so the same group is compared every year. Days when the whole market fell 2% or more are left out, so crashes like 2020 do not count; what is left is company-specific: a bad quarter, a guidance cut, a lawsuit. The dashed line is the average of the calmer years; the gold bar is this year so far. A big company dropping 10% in a day used to be rare.
If giants now fall like small companies on one report, how much risk a 'safe' portfolio carries has changed.
Bill Ackman, this month: "Now every quarter there's some relatively large company where the stock price moves enormously." The data agrees, and the jump is recent.
The Signal deskCompany-specific one-day falls of 10% or more per year: 2010 12; 2011 10; 2012 13; 2013 12; 2014 8; 2015 8; 2016 9; 2017 6; 2018 9; 2019 11; 2020 3; 2021 4; 2022 8; 2023 9; 2024 22; 2025 21; 2026 25 (through Oct 27, 2026). The S&P 500 fell less than 2% on each of those days.
A large-company portfolio carries more single-day risk than it used to. That cuts both ways: deeper air pockets for patient buyers, and protective orders that fire on a bad morning rather than a broken business.
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Source: Yahoo Finance daily total-return closes, Oct 27, 2026; Nova One's calculation. Today's members only: companies that left the index are not counted. Every number on the chart is computed from the source data in the same run that drew it. The Signal is research, not investment advice. How we work · Disclosures