6th September 2026
October has an extraordinary history of sudden financial crashes.
Six of the eight largest falls in Dow Jones history happened in October, including 1929, 1987, 1997 and 2008.
Couple that fact with Bank of England Governor Andrew Bailey warning this week that markets face a high risk of a disorderly correction.
His concern is not abstract. Valuations are stretched, meaning markets are priced far above what fundamentals justify, and that correction is overdue.
The danger is amplified by debt. Bailey thinks too much borrowed money is being used to buy shares through Exchange Traded Funds and hedge funds, and so when sentiment turns, losses might intensify.
Concentration makes this risk worse. Seven giant tech companies, above all those tied to frontier AI, now dominate valuations while cross-investment between AI models and data centres ties their fates together.
Bond markets are already in panic and stock markets are swinging sharply, and the upside for staying exposed is shrinking.
Bailey's message, echoed here, is to head for safety while you can. Choosing the safest option for your finances is not pessimism but prudence when stretched valuations, debt and concentration collide in the most dangerous month.
History shows October does not forgive stretched markets when debt and concentration have already made them fragile
00:00 Could Stock Markets Crash This October?
00:54 October’s History of Financial Crashes
01:48 The Biggest October Market Collapses
02:40 Crashes vs Long Bear Markets
03:34 Why September 2026 Matters
04:25 The Warning From the Bank of England
05:25 Are Stock Markets Overvalued?
06:18 Why Borrowing to Buy Shares Is Dangerous
07:21 How Debt Could Amplify a Market Crash
08:08 Could the AI Boom Trigger the Crisis?
08:43 Should Investors Prepare for a Crash?