Brexit Market Shock 2016: The Pound's Record Fall

Key Takeaways

• UK voters chose to leave the EU on June 23, 2016, by 51.9% to 48.1%.
• Sterling fell about 10% overnight to roughly $1.32, a multi-decade low.
• Around $2 trillion was wiped off global equities on June 24, a record one-day loss.
• The internationally exposed FTSE 100 recovered fast while domestic UK shares fell hard.

Background

The United Kingdom had been a member of the European Union and its predecessors since 1973. By 2016, membership had become the central fault line in British politics, and Prime Minister David Cameron, who led the Conservative government and supported staying in, had promised an in-or-out referendum to settle the question.

Markets spent the spring of 2016 treating a Remain win as the base case. Bookmakers and most opinion polls leaned toward staying in, and sterling traded firmly in the days before the vote on hopes that the status quo would hold. That confidence is the key to understanding what followed. When markets price in one outcome and the opposite arrives, the repricing is sudden and large.

Sterling is one of the most heavily traded currencies in the world, and the UK is a major financial center, so a UK political shock does not stay local. The London Stock Exchange hosts the FTSE 100, an index dominated by multinational companies that earn most of their revenue overseas, alongside the FTSE 250, whose members are far more tied to the domestic British economy. That split would matter enormously once the result was known.

The referendum was held on Thursday, June 23, 2016. Counting ran through the night, and the picture for investors changed in real time as results came in from each region.

What Happened

The official result, certified by the Electoral Commission, was a vote to leave by 51.9% to 48.1%, on a turnout of 72.2%, the highest in a UK-wide vote since 1992. The outcome became clear in the early hours of Friday, June 24, and markets reacted before the sun was up in London.

• Late June 23 into early June 24: As leave results stacked up, sterling went into freefall in thin overnight trading. According to the University of Cambridge analysis, the pound dropped roughly 10% overnight and was down about 8% by the end of the trading day.
• Early June 24: Sterling hit its lowest level against the US dollar since 1985, falling to around $1.32. The Federal Reserve Bank of San Francisco later estimated the pound depreciated about 7% on the day of the referendum against its main trading partners.
• Morning of June 24: David Cameron, who had campaigned to remain, announced his resignation outside 10 Downing Street, saying the country needed "fresh leadership."
• Asian and European session: Japan's Nikkei fell 7.9%, and continental indices were hit hardest of all, with Milan and Madrid each down more than 12% for their biggest single-day losses on record, per S&P Dow Jones Indices figures reported by CNBC.
• London open: The FTSE 100 fell about 3.15% at the close after a far deeper intraday plunge, while the domestically focused FTSE 250 fell roughly 7%.
• US session: The S&P 500 fell about 3.6%, and investors piled into gold, US Treasuries, and the Japanese yen.

The move in sterling was historic by any yardstick. The Cambridge analysis noted that only four times since 1900 had the pound dropped so much in a single day, in 1931, 1940, 1949, and 1967. Even Black Wednesday in 1992, when the UK was forced out of the European exchange rate mechanism, did not produce a one-day fall of this size.

Why It Happened

The Brexit market shock was a repricing shock, not a credit or banking failure. Nothing defaulted on June 24. What changed was the market's estimate of the future, and the speed of that change is what made it violent.

Start with expectations. Sterling and UK equities had drifted higher into the vote on the assumption of a Remain win. When the result flipped that assumption, every position built on it had to be unwound at once. The pound carried the heaviest load because currency markets trade around the clock and could move while equity exchanges were still closed, which is why the sharpest sterling losses came in the overnight hours.

The currency took the brunt for a structural reason too. A leave vote raised genuine uncertainty about future trade access, investment flows, and the path of the UK economy. The cleanest way for global investors to express that uncertainty was to sell the pound, because a currency reprices instantly and reflects the whole economy at once. The San Francisco Fed later traced how the weaker pound fed through into UK inflation, finding the Brexit effect on inflation peaked at about 1.2 percentage points in the eight months after the vote, as costlier imports raised prices.

Equities then split along an exposure line, and this is the part most investors remember. The FTSE 100 is full of multinationals, oil majors, miners, and consumer-goods firms that book a large share of earnings in dollars and euros. When sterling collapses, those overseas earnings translate into more pounds, which props up the headline index. The FTSE 100 actually recovered all of its post-vote losses within two trading days. The FTSE 250 and UK bank shares, tied to the British domestic economy, had no such cushion and fell hard and stayed weak, because a weaker pound and a more uncertain economy were a direct headwind for them.

The flight to safety followed the standard crisis script. With risk assets falling, capital rushed into havens. Gold jumped about 5% as the gold ETF SPDR Gold Shares returned roughly 4.9% in the pre-market session. US Treasuries rallied, pushing yields down, and the Japanese yen surged against nearly every major currency, briefly strengthening below 100 to the dollar before the Bank of Japan was reported to step in. These flows did not reflect a view on Britain so much as a general dash for assets that hold value when the future turns hazy.

By the Numbers

• Referendum result: Leave 51.9% to Remain 48.1%, turnout 72.2%, on June 23, 2016. (House of Commons Library)
• Sterling fall: down about 10% overnight on June 24 and about 8% by the close, the biggest one-day modern drop. (University of Cambridge / The Conversation)
• Sterling level: a low of around $1.32, the weakest against the dollar since 1985. (Economics Observatory; University of Cambridge)
• On-the-day depreciation: about 7% against the pound's main trading partners. (Federal Reserve Bank of San Francisco)
• Global equity loss: about $2.08 trillion wiped off world stocks on June 24, the biggest daily loss ever recorded, exceeding the Lehman bankruptcy and Black Monday 1987, equal to roughly 4.7% of total market value. (S&P Dow Jones Indices, via CNBC)
• Index moves: Nikkei down 7.9%, Milan and Madrid down more than 12% each, S&P 500 down about 3.6%, FTSE 100 down about 3.15%. (S&P Dow Jones Indices, via CNBC)
• UK split: the domestically focused FTSE 250 fell roughly 7%, far more than the overseas-earning FTSE 100, which recovered within two trading days. (CNBC; market data)
• Safe-haven move: gold rose about 5%, with the SPDR Gold Shares ETF up roughly 4.9% pre-market. (Nasdaq)
• Policy response: Bank Rate cut to 0.25% from 0.50% on August 4, 2016, the first cut since 2009, plus GBP 60 billion of additional gilt purchases. (Euronews)

Aftermath

The political fallout was immediate. David Cameron resigned on the morning of June 24, having campaigned to stay in the EU, and was replaced by Theresa May the following month. The currency and equity moves of that day were the result of a democratic vote, not any fraud or misconduct, and no legal wrongdoing was alleged against policymakers in connection with the market reaction.

The Bank of England moved to steady the system. On the morning of the result, Governor Mark Carney publicly reassured markets that the central bank was prepared and would supply liquidity to the banking system as needed. Then, on August 4, 2016, the Bank cut its main interest rate to 0.25% from 0.50%, the first reduction since 2009, and expanded its bond-buying program by GBP 60 billion of government debt plus corporate-bond purchases and a new lending scheme. Carney framed it plainly, saying there was "a clear case for stimulus, and stimulus now."

The currency damage proved lasting in a way the equity damage did not. Global stocks largely clawed back their June 24 losses within days, and the FTSE 100 ended 2016 sharply higher, helped by the weak pound boosting its overseas earners. Sterling did not recover. The San Francisco Fed found the pound stayed near its post-vote level for about a year, accumulating a decline of roughly 14% from the prior year, which fed through to push UK consumer inflation from near zero at the vote up toward 3% by the end of 2017.

The episode also reset how markets think about binary political events. Traders who had treated a Remain win as near-certain learned that opinion polls and betting odds are not prices, and that a 52-48 result can move markets as if it were a landslide. In the years after, large referendums and elections came with much wider option-implied volatility and bigger hedging, precisely because the Brexit market shock showed how fast a surprise outcome can reprice everything.

Lessons for Investors

1. A currency reprices a whole economy in one move. Sterling, not the stock index, took the cleanest hit because a currency can trade overnight and reflects the entire economic outlook at once. When you assess political risk, watch the foreign-exchange market first, because it often tells the story before equities open.

2. Where a company earns its money decides how it reacts. The FTSE 100 rose back fast because its multinationals earn abroad, so a weaker pound helped them, while the domestically focused FTSE 250 and UK banks fell hard. Two indices in the same country went opposite directions on the same news. Know the revenue geography of what you own.

3. Markets price probabilities, and surprises are repriced instantly. Sterling was firm into the vote on the assumption of a Remain win. A 51.9% to 48.1% result is close, yet it moved the market as much as a landslide because the consensus had leaned the other way. The size of a market reaction depends on the surprise, not the margin.

4. Safe havens behave predictably in a panic. Gold, US Treasuries, and the yen all rallied as risk assets fell, doing what havens are supposed to do. A small allocation to assets that gain when others fall can cushion a portfolio through a shock you did not see coming.

5. A record headline loss can be temporary. The roughly $2 trillion erased on June 24 was the biggest one-day equity loss ever in dollar terms, yet global stocks recovered the bulk of it within days. Selling into a panic that turns out to be a repricing rather than a solvency crisis can lock in a loss the market itself was about to reverse.

Frequently Asked Questions

What was the Brexit market shock in simple terms? The Brexit market shock was the sharp global market reaction on June 24, 2016, after the UK voted to leave the EU. The pound crashed to a multi-decade low and world stocks lost about $2 trillion in a single day.

Why did the Brexit market shock happen? Markets had largely priced in a vote to stay in the EU, so the leave result forced a sudden reversal of those positions. Investors sold the pound and UK domestic shares to express new uncertainty about Britain's trade and economic future, and that selling hit hardest where the surprise was greatest.

How much money was lost in the Brexit market shock? Global equities lost about $2.08 trillion on June 24, 2016, the biggest one-day loss on record at the time, per S&P Dow Jones Indices. Sterling fell roughly 10% overnight to around $1.32, its weakest against the dollar since 1985.

Could a Brexit-style market shock happen again today? Yes. The mechanics, a surprise political result repricing a currency and crowded positions, are permanent features of markets. What changed is that investors now hedge major votes more heavily and assume polls are not certainties, so some shocks are better cushioned than in 2016.

What is the main lesson from the Brexit market shock? The cleanest takeaway is that political surprises hit currencies first and hit companies according to where they earn their money. A weak pound crushed domestic UK shares yet helped overseas-earning multinationals, so the same event moved different assets in opposite directions.

Sources

1. Federal Reserve Bank of San Francisco. The Brexit Price Spike. Economic Letter 2019-21, August 2019. https://www.frbsf.org/research-and-insights/publications/economic-letter/2019/08/brexit-price-spike/
2. House of Commons Library. Analysis of the EU Referendum results 2016 (CBP-7639). https://commonslibrary.parliament.uk/research-briefings/cbp-7639/
3. CNBC. Brexit cost investors $2 trillion, the worst one day drop ever. June 26, 2016. https://www.cnbc.com/2016/06/26/brexit-cost-investors-2-trillion-the-worst-one-day-drop-ever.html
4. The Conversation / University of Cambridge. Brexit shock has caused a sterling crash of historic proportions. June 27, 2016. https://theconversation.com/brexit-shock-has-caused-a-sterling-crash-of-historic-proportions-heres-just-how-bad-it-is-for-the-pound-62191
5. Economics Observatory. How has Brexit affected the value of sterling? https://www.economicsobservatory.com/how-has-brexit-affected-the-value-of-sterling
6. Euronews. Bank of England cuts interest rates to new record low of 0.25% in first drop since 2009. August 4, 2016. https://www.euronews.com/2016/08/04/bank-of-england-cuts-interest-rates-to-new-record-low-of-025-in-first-drop
7. CNN. David Cameron's resignation speech in full. June 24, 2016. https://www.cnn.com/2016/06/24/europe/david-cameron-full-resignation-speech
8. Nasdaq. Britain Exits EU: Are Gold ETFs the Safest Haven Now? June 24, 2016. https://www.nasdaq.com/articles/britain-exits-eu:-are-gold-etfs-the-safest-haven-now-2016-06-24

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.