Episode 7 of 12 The Greatest Rallies in Market History

Europe, Downgrades, and Debt Ceilings

After the existential crisis of 2008–09, markets had a different set of problems. Greece was bankrupt. Portugal and Ireland were wobbling. The United States lost its AAA credit rating for the first time in history. And algorithms triggered a “Flash Crash” that briefly erased a trillion dollars of market value in minutes. Four +4% days erupted between 2010 and 2011 — each one born from a crisis that would have been unimaginable a decade earlier.

Finexus Research · March 19, 2026 · 2010–2011

The 2010–2011 period was a different animal from 2008. The banking system had been stabilized — barely — and the acute fear of systemic collapse had faded. In its place came a slow-burning anxiety about sovereign debt. The governments that had bailed out the banks now needed bailing out themselves. Greece’s deficit was revealed to be far worse than reported. Ireland’s banking guarantee nearly bankrupted the state. Portugal required a rescue. And the United States, which had spent trillions to prevent a depression, saw its creditworthiness questioned for the first time.

The four +4% rallies of this period ranged from 4.33% to 4.74% — modest by the standards of 2008, when double-digit days were routine. But they occurred against a backdrop of unprecedented policy experimentation: quantitative easing, coordinated central bank swap lines, and a political brinksmanship over the US debt ceiling that would have seemed absurd in any previous era. The crises were new, the tools were new, and the rallies reflected a market that was learning to price a world where governments themselves were the risk.

May 10, 2010: The Flash Crash Aftermath

On May 6, 2010, the S&P 500 dropped 3.24% in the regular session — but that number understates the chaos. During the afternoon, a cascade of algorithmic selling drove the Dow Jones Industrial Average down nearly 1,000 points in minutes — the infamous “Flash Crash.” Individual stocks traded at a penny. Accenture briefly fell from $40 to $0.01. Procter & Gamble dropped 37% before recovering. The event lasted only 36 minutes, but it revealed a terrifying fragility in the structure of modern markets.

The S&P continued to slide on May 7, closing at 1,110.88 — down 7.7% from its April 26 peak. And then, on Monday, May 10, the European Union announced a €750 billion rescue package for the eurozone, and the S&P rallied 4.40%, closing at 1,159.73. The rescue was massive — larger than TARP — and it signaled that European governments would not let the sovereign debt crisis spiral into a banking crisis.

The breadth was extraordinary. Of 3,315 stocks with data, 2,867 advanced (86.5%), with an average gain of 4.27% and a median of 4.50%. The rally was led by European banks listed in New York: ING Groep (+25.38%), Banco Santander (+22.92%), BBVA (+19.68%), and Barclays (+17.95%). These were the names that had been hit hardest by contagion fears, and the rescue package was a direct reprieve.

“The Flash Crash was not the crisis. It was a symptom of a market whose plumbing had outrun its wiring. The real crisis was Greece — and the rally came when Europe showed it was willing to pay the bill.”

August 2011: The Downgrade

The summer of 2011 produced the most violent two-week stretch in markets since the 2008 crisis — and it was triggered not by a bank failure or a recession, but by politics.

The US debt ceiling, a legislative formality that had been raised dozens of times without drama, became a hostage in a standoff between the Obama administration and House Republicans. The possibility that the United States might default on its obligations — not because it lacked the money, but because Congress refused to authorize payment — was genuinely unprecedented. A last-minute deal was reached on August 2, but the damage was done.

On August 4, the S&P 500 fell 4.78%. On August 5, Standard & Poor’s downgraded the US credit rating from AAA to AA+ — the first downgrade in the nation’s history. The rationale was not America’s ability to pay, but the “political risks” revealed by the debt ceiling crisis. On Monday, August 8, the market plunged 6.66%.

August 9, 2011: +4.74%. The S&P surged from 1,119.46 to 1,172.53. The catalyst was the Federal Reserve’s FOMC statement, which for the first time provided explicit calendar guidance: rates would stay near zero “at least through mid-2013.” This was new territory — the Fed had never before committed to a specific timeline for near-zero rates. The market took it as a promise that the Fed would not allow the sovereign debt panic to metastasize into a credit crunch.

Breadth was strong: 3,000 of 3,535 stocks advanced (84.9%), with an average gain of 4.88% and a median of 4.74%. The rally was led by financials that had been battered in the downdraft: Bank of America (+16.67%), NXP Semiconductors (+18.36%), and First Industrial Realty (+19.72%).

August 11, 2011: The Whipsaw

Two days after the +4.74% rally, on August 10, the market gave it all back — falling 4.42%. And then on August 11, it surged 4.63% again, closing at 1,172.64. The S&P finished the day at almost exactly the same level as August 9.

The trigger was a ban on short selling of financial stocks in France, Italy, Spain, and Belgium. The European regulators’ logic was simple: if you can’t stop the panic, ban the panickers. It was a blunt instrument, and it was temporary, but it worked — at least for one day. The ban signaled that European authorities would use every tool available to prevent a replay of the Lehman moment in European banks.

The three-day sequence — +4.74%, −4.42%, +4.63% — was a microcosm of the entire period. The market was being whipsawed between fear of sovereign default and faith in central bank intervention. August 2011 produced the most volatile two-week stretch since October 2008: between August 4 and August 18, the S&P had seven days with moves exceeding ±2%, including four exceeding ±4%.

Breadth on August 11 was broad but slightly narrower than August 9: 2,931 of 3,535 stocks advanced (82.9%), with an average gain of 4.77%. The pattern was clear — each successive bounce drew slightly less participation, suggesting the market was fighting exhaustion even as it produced extraordinary rallies.

“In three trading days — August 9, 10, and 11 — the S&P 500 rose 4.74%, fell 4.42%, and rose 4.63%. The market ended exactly where it started. The only winners were the volatility traders.”
S&P 500 Daily: The August 2011 Whipsaw
July 25 – August 25, 2011 · Showing the debt ceiling selloff, US downgrade, and violent rebounds

November 30, 2011: The Coordinated Rescue

By November 2011, the European debt crisis had entered a new phase. Greece had accepted a second bailout. Italy’s borrowing costs were spiking to unsustainable levels, and Prime Minister Silvio Berlusconi had been replaced by technocrat Mario Monti. Spain was under pressure. The fear was that the crisis had moved beyond the small periphery countries and was engulfing the eurozone’s third and fourth largest economies.

The S&P had drifted lower through November, falling from 1,257 to 1,158 over ten trading days. And then, on November 30, six central banks — the Federal Reserve, the European Central Bank, the Bank of England, the Bank of Japan, the Bank of Canada, and the Swiss National Bank — announced coordinated action to lower the cost of dollar lending to European banks. The swap lines that had been established during the 2008 crisis were expanded and cheapened.

The market response was immediate: the S&P surged 4.33%, closing at 1,246.96. It was the kind of rally that only coordinated central bank action can produce — a signal that the world’s major economies would act together to prevent a liquidity crisis from becoming a solvency crisis.

Breadth was the strongest of the four 2010–2011 rallies: 3,010 of 3,586 stocks advanced (83.9%), with an average gain of 6.19% and a median of 4.00%. The outsized average — far above the median — was driven by high-beta names staging violent reversals: Argan (+18.39%), Sterling Infrastructure (+15.86%), and Regions Financial (+14.40%).

The Four +4% Rally Days: 2010–2011
Single-day S&P 500 returns ≥+4% · Bar height = percentage gain

The Data

DateReturnClosePrior CloseAdvancersContext
May 10, 2010 +4.40% 1,159.73 1,110.88 2,867 / 3,315 (86.5%) EU €750B rescue package; Flash Crash aftermath
Aug 9, 2011 +4.74% 1,172.53 1,119.46 3,000 / 3,535 (84.9%) Fed pledges rates near zero “at least through mid-2013”
Aug 11, 2011 +4.63% 1,172.64 1,120.76 2,931 / 3,535 (82.9%) European short-selling ban on financial stocks
Nov 30, 2011 +4.33% 1,246.96 1,195.19 3,010 / 3,586 (83.9%) Coordinated six-central-bank swap line expansion

Stock Movers: The Most Telling Names

The stock movers of 2010–2011 tell the story of the period’s crises. On May 10, 2010, the top performers were European banks — the direct beneficiaries of the EU rescue package. On August 9, 2011, the leaders were US financials that had been caught in the sovereign debt crossfire. On November 30, 2011, cyclicals and financials led the charge as coordinated central bank action eased liquidity fears.

StockCompanyReturnRally DayMkt Cap ($B)
May 10, 2010 — EU Rescue Package
INGING Groep N.V.+25.38%May 1073.8
SANBanco Santander+22.92%May 10158.1
BBVABanco Bilbao Vizcaya Argentaria+19.68%May 10116.4
BCSBarclays PLC+17.95%May 1070.9
NWGNatWest Group+15.10%May 1029.8
August 9, 2011 — Fed Calendar Guidance
BACBank of America+16.67%Aug 9341.2
NXPINXP Semiconductors+18.36%Aug 948.2
HIGHartford Financial Services+15.56%Aug 937.1
TDGTransDigm Group+14.95%Aug 968.6
HEIHEICO Corp+15.05%Aug 940.1
November 30, 2011 — Central Bank Coordination
AGXArgan, Inc.+18.39%Nov 306.4
RFRegions Financial+14.40%Nov 3021.9
MTArcelorMittal+13.95%Nov 3038.9
SWKSSkyworks Solutions+12.46%Nov 308.2

Context: The S&P 500 in 2010–2011

S&P 500 Monthly Returns: 2010–2011
Monthly returns (%) · Green = positive, Red = negative · Rally months marked with arrows

The monthly chart reveals the character of the 2010–2011 period: a market that was broadly rising but punctuated by sharp corrections. May 2010 dropped 9.39% (Flash Crash month). August 2011 fell 5.29% (downgrade month). September 2011 plunged 6.06%. But October 2011 surged 14.02% — the best month since March 2009. The overall trajectory was upward: the S&P started 2010 at 1,132.99 and ended 2011 at 1,257.60, a gain of about 11% over two years. The rallies were turbulence, not trend changes.

What Was Different About 2010–2011

Three features distinguished the +4% rallies of 2010–2011 from every period that came before.

Sovereign risk replaced bank risk. In 2008, the question was whether Goldman Sachs or Morgan Stanley would survive the weekend. In 2010–2011, the question was whether Greece, Portugal, or even the United States could honor its debts. The rally catalysts shifted accordingly: EU rescue packages, central bank swap lines, and credit rating decisions replaced TARP votes and bank mergers.

Central banks became the primary market mover. Two of the four rallies (August 9 and November 30) were directly triggered by central bank actions. The Fed’s explicit forward guidance on August 9, 2011 — committing to near-zero rates for two more years — was a new tool. The coordinated six-bank swap line expansion on November 30 was a tool invented during the 2008 crisis, now deployed preemptively. Markets were learning to trade around central bank actions rather than economic data.

The rallies were smaller. The four rallies ranged from 4.33% to 4.74% — all below the 5% threshold. In 2008, six of seventeen +4% days exceeded 5%, and two exceeded 10%. The moderation suggested that while the crises were real, the systemic risk was lower. The financial system was bruised, not broken.

Timeline

The Bottom Line

The four +4% rallies of 2010–2011 marked the moment when markets learned to price sovereign risk and central bank omnipotence simultaneously. The crises were real — Greece was bankrupt, the US was downgraded, European banks were under siege — but the tools deployed to fight them were new and powerful: multi-hundred-billion-euro rescue packages, explicit forward guidance, coordinated global swap lines.

The rallies were smaller than 2008 (+4.33% to +4.74% versus +4% to +11.58%), but the breadth was consistently strong (82.9% to 86.5% of stocks advancing). The market was not panicking — it was repricing. And unlike 2008, where the +4% days were desperate bounces inside a collapsing market, the 2010–2011 rallies occurred inside a market that was fundamentally trending higher. The S&P 500 ended 2011 at almost exactly the same level as the start of 2010. The +4% days were corrections within a consolidation, not death throes within a crash.

The era also introduced a dynamic that would define markets for the next decade: central banks as the ultimate backstop. When sovereign risk flared, the rallies came not from earnings reports or economic data, but from central bank statements and coordinated interventions. The message was clear — the Fed and its peers would not allow developed-world sovereign default. The market believed them. And for the next eight years, the +4% rally would virtually disappear.