The Man Who Lost $20 Billion in Ten Days

Sung Kook Hwang arrived in the United States from South Korea as a teenager, a pastor's son with an aptitude for numbers and a quiet, almost monastic intensity. He studied economics at UCLA, earned an MBA at Carnegie Mellon, and by the mid-1990s had landed at Tiger Management, the legendary hedge fund run by Julian Robertson. Robertson's acolytes — the so-called "Tiger Cubs" — would go on to seed some of the most powerful funds on Wall Street. Hwang was among them. He launched Tiger Asia Management in 2001, focusing on Asian equities, and for a while the returns were extraordinary.

But Tiger Asia carried a flaw that would prove prophetic. In 2012, the fund pleaded guilty to wire fraud charges related to insider trading in Chinese bank stocks, and Hwang personally paid $44 million to settle civil charges with the SEC. Hong Kong's securities regulator banned him from trading in the territory. For most people, that would have been the end.

Hwang saw it differently. He spoke openly about his Christian faith, about stewardship and redemption. He shut down Tiger Asia and, in 2013, opened a new vehicle: Archegos Capital Management. The name came from the ancient Greek word for "leader" or "pioneer" — a term used in the New Testament to describe Jesus. Archegos was structured not as a hedge fund but as a family office, managing only Hwang's personal wealth. That distinction was everything. Hedge funds register with the SEC, file regular disclosures, and face position limits. Family offices, by contrast, face significantly less regulatory disclosure and reporting requirements. Hwang had found a loophole the size of a cathedral.

From a nondescript office on the 38th floor of a Midtown Manhattan skyscraper, Hwang began to trade again — quietly, aggressively, and at a scale that would have astonished even Robertson. He wasn't building a diversified portfolio. He was making enormous, concentrated bets on a small number of stocks, using a specific type of derivative — total return swaps — that allowed him to gain economic exposure without triggering the same ownership disclosure requirements as direct share purchases. No one outside his prime brokers knew how big his positions were. And even the brokers didn't know the full picture, because Hwang was spreading his swaps across multiple banks, each seeing only its own slice of the elephant.

By early 2021, Archegos was managing over $36 billion in assets. The quiet family office of a disgraced trader had become, in secret, one of the largest and most leveraged players in global equity markets. And almost nobody knew.

To understand what happened next, you need to understand total return swaps — and why they were, for Bill Hwang, the perfect instrument.

A total return swap is a contract between an investor and a bank. The investor says: I want exposure to Stock X. The bank buys the stock (or agrees to pay the investor as if it had), and in return the investor posts collateral — typically a fraction of the stock's value. If the stock goes up, the bank pays the investor the gain. If it goes down, the investor pays the bank. It's leverage, pure and simple, but with a crucial twist: because the bank technically owns the shares, the investor's name never appears on any public filing. There is no 13D disclosure, no Schedule 13G, no flag to the market that someone is building a massive position.

Hwang used this structure to build staggering concentrations in a handful of names. Among the largest was ViacomCBS, the media conglomerate. He also held enormous positions in Discovery, GSX Techedu, and several other stocks. The leverage ratios were breathtaking — by some estimates, Archegos was controlling eight dollars of stock for every dollar of its own capital. And because Hwang was spreading his swap contracts across Goldman Sachs, Morgan Stanley, Credit Suisse, Nomura, Deutsche Bank, and others, no single bank could see the full scope of his exposure.

The prime brokers were not innocent bystanders. They were earning lucrative fees from Hwang's trading. Credit Suisse, in particular, had been expanding its prime brokerage business aggressively, hungry for the kind of revenue that clients like Archegos generated. Internal risk warnings were, by multiple accounts, repeatedly overridden or ignored. The fees were too good. The client was too profitable.

For a while, the strategy worked spectacularly. Hwang's concentrated bets pushed stock prices higher, which increased the value of his collateral, which allowed him to take on even more leverage, which pushed prices higher still. It was a virtuous cycle — or, more precisely, a reflexive one. The same mechanism that amplified gains on the way up would amplify losses on the way down.

In early March 2021, ViacomCBS announced a secondary stock offering to raise capital. The market took it as a signal that the stock was overvalued. Shares began to slide. For most investors, a 10% or 15% decline in a single holding is manageable. For Bill Hwang, with his leverage and concentration, it was the first tremor before the earthquake.

The margin calls started coming.

The calls went out on Thursday night and into Friday morning. Archegos could not meet its margin requirements. The collateral Hwang had posted was no longer sufficient to cover the declining value of his positions. Each bank now faced an agonizing choice: try to negotiate a coordinated, orderly unwind — or start selling immediately, before anyone else could.

On March 26, 2021, Archegos defaulted on margin calls from several global investment banks, including Credit Suisse and Nomura Holdings, as well as Goldman Sachs and Morgan Stanley. The news rippled through trading desks around the world. But the crucial decisions had already been made — in some cases, hours earlier.

Goldman Sachs and Morgan Stanley moved first. Their risk teams, recognizing the scale of the problem, began liquidating Archegos-linked positions on Thursday afternoon, before the formal default. Goldman reportedly organized block trades — massive, pre-arranged sales of stock to institutional buyers — that allowed it to offload billions of dollars in exposure in a matter of hours. Morgan Stanley did the same. The trades were enormous. On Friday morning, blocks of ViacomCBS, Discovery, and other Archegos-linked names hit the market in sizes that stunned even veteran traders.

Credit Suisse and Nomura did not move as fast. Whether out of hope that Hwang might find additional capital, or out of a desire to negotiate a more orderly solution, or simply out of slower internal decision-making, the two banks hesitated. By the time they began selling, the stocks had already cratered. The difference in timing — perhaps 12 to 24 hours — would prove catastrophic.

Bill Hwang lost $20 billion over ten days in late March 2021. His personal fortune, built over decades, evaporated in less than two weeks. But the real carnage was at the banks. Credit Suisse would eventually report losses of approximately $5.5 billion from the Archegos debacle. Nomura disclosed losses of roughly $3 billion. Goldman and Morgan Stanley, by contrast, emerged with relatively modest damage — a testament to the brutal mathematics of selling first.

The lesson was immediate and visceral: banks that act faster to liquidate collateral in a margin call scenario limit their losses compared to banks that delay. There was no prize for cooperation. There was no penalty for racing to the exits. The bank collusion probe that would later investigate whether Goldman and Morgan Stanley had coordinated their selling would ultimately close without charges. In the Archegos unwind, speed was the only virtue that mattered.

Credit Suisse, already weakened by the Greensill Capital scandal earlier that same month, now faced an existential question. Could a 167-year-old institution — one the Financial Stability Board had designated as a global systemically important financial institution — survive this kind of blow?

For more than a year after the collapse, Hwang remained free, living quietly in New Jersey. The Department of Justice was building its case methodically, tracing the web of swap contracts, the misleading representations to counterparties, the deliberate concealment of position sizes. On April 27, 2022, Bill Hwang was indicted on federal charges of fraud and racketeering. Prosecutors alleged that he had systematically misled the banks about the size and concentration of his positions, turning what should have been a transparent counterparty relationship into a confidence game.

The trial, when it came, was a spectacle of Wall Street dysfunction laid bare. Hwang's former chief risk officer testified against him, describing internal practices that prioritized returns over risk management. The risk head who cooperated with prosecutors ultimately avoided prison. Other Archegos employees faced their own legal consequences.

The jury found Hwang guilty of fraud and racketeering involving his ViacomCBS positions. It was a landmark verdict — the first time a family office manager had been convicted of market manipulation on this scale. The case established that total return swaps, while legal instruments, could not be used as tools of deception. Hiding the true size of your market footprint from the very banks lending you money was not clever financial engineering. It was fraud.

But the legal aftermath extended far beyond Hwang himself. Investors who had lost money when Archegos-linked stocks cratered sued Goldman Sachs and Morgan Stanley, alleging that the banks had engaged in insider trading by selling their Archegos positions before the default became public. Both banks prevailed on appeal. The courts found that the banks had acted to protect their own balance sheets — a right, not a crime.

At Credit Suisse, the damage was structural. Nineteen employees eventually settled claims related to the Archegos losses, with D&O insurers on the hook for up to $115 million. One Credit Suisse trader who was fired in the aftermath of the Archegos mess successfully sued for wrongful termination and won $8 million in back pay. The bank's prime brokerage business, once a crown jewel, was effectively dismantled. Clients fled. Revenue dried up. The Archegos losses, layered on top of the Greensill scandal, a series of money-laundering investigations, and a broader crisis of confidence, pushed Credit Suisse into a death spiral from which it would never recover.

In March 2023 — almost exactly two years after Archegos defaulted — Swiss regulators orchestrated the forced merger of Credit Suisse with UBS. A 167-year-old institution, once among the most prestigious names in global finance, ceased to exist as an independent entity. Credit Suisse's inability to recover from the Archegos losses was a central factor in its eventual forced merger.

Bill Hwang, meanwhile, had one more card to play.

After his conviction, Bill Hwang did not go quietly. Reports emerged that he sought a presidential pardon from Donald Trump for the fraud that cost banks an estimated $10 billion. The audacity of the request — a convicted market manipulator asking the president to erase his crimes — captured something essential about Hwang's character: an unshakeable belief that the rules, ultimately, did not apply to him.

The pardon request placed the Archegos saga in a strange new light. Here was a man who had already been sanctioned once, in 2012, for insider trading at Tiger Asia. He had reinvented himself, built a new vehicle specifically designed to avoid regulatory scrutiny, leveraged it to extraordinary dimensions, and when it all collapsed, had been convicted by a jury of his peers. Now he was seeking clemency — not on the grounds of innocence, but on the grounds of, essentially, political connection.

The SEC, for its part, continued to pursue Hwang even after the criminal conviction. Reports indicated the agency was making progress toward a civil settlement, suggesting that the regulatory apparatus, however slowly, was still grinding forward. The broader investigation into whether the banks had colluded in their selling — the question of whether Goldman and Morgan Stanley had unfairly raced to the exits — closed without charges. No one was punished for selling fast. Everyone was punished for selling slow.

The asymmetry of that outcome haunts Wall Street to this day. In the 1998 collapse of Long-Term Capital Management, the Federal Reserve had brokered a coordinated unwind among LTCM's counterparties, preventing a fire sale. The lesson of LTCM was supposed to be: cooperate, share the pain, prevent contagion. The lesson of Archegos was the opposite. Banks that cooperated — that waited, that tried to negotiate — absorbed catastrophic losses. Banks that defected — that sold first, asked questions later — walked away largely unscathed.

The precedent is chilling. When market participants learn that racing to sell first is rewarded and waiting is punished, future liquidation events tend to become faster and more disorderly. The next time a major counterparty fails, every prime broker on Wall Street will remember Archegos. And every one of them will reach for the sell button at the same time.

The structural conditions that enabled the Archegos blowup — lightly regulated family offices, opaque derivative positions, fragmented prime brokerage relationships — remain largely intact. Post-Archegos regulatory tightening has made a precise repeat of this scenario less probable, but concentrated leverage risk has a way of finding new channels. The SEC's continued interest in the family office space suggests regulators understand the gap, even if closing it remains politically difficult.

Walk down Paradeplatz in Zurich today and the Credit Suisse logo is gone. The building still stands — limestone and grandeur, the physical architecture of Swiss financial prestige — but the name above the door now reads UBS. Inside, thousands of former Credit Suisse employees have been absorbed, reassigned, or let go. The integration is still ongoing, a slow-motion digestion of one giant by another.

The removal of Credit Suisse as a standalone entity may have, on balance, reduced systemic risk in European banking. Fewer points of failure, a stronger surviving institution, a cleaner counterparty landscape. But it also concentrated even more power in UBS, creating a Swiss banking sector dominated by a single colossus. Whether that concentration is safer or merely different is a question regulators will be answering for years.

For Goldman Sachs and Morgan Stanley, the Archegos aftermath was, perversely, a competitive windfall. Both banks likely gained prime brokerage market share as Credit Suisse exited the business. The clients who had once traded through Credit Suisse needed new homes. The fees followed. In the cold arithmetic of Wall Street, one bank's catastrophe is another bank's opportunity.

The D&O insurance market felt the aftershocks too. With insurers on the hook for up to $115 million in Credit Suisse employee settlements alone, premiums across the financial services industry ticked higher. Risk managers at banks around the world updated their counterparty exposure models. Compliance departments tightened their swap monitoring. For a few months, at least, the system paid attention.

But memory on Wall Street is short. The fees from prime brokerage are enormous. The temptation to extend leverage to concentrated, high-turnover clients is perpetual. And the family office loophole — the regulatory gap that allowed Hwang to build a $36 billion portfolio in near-total secrecy — has not been fully closed. Meaningful family office regulation remains a political challenge, even as the direction of travel is clear.

Bill Hwang's story is, in the end, a parable about visibility — or the lack of it. The banks couldn't see his full exposure. The regulators couldn't see his positions. The market couldn't see the concentration risk building beneath the surface. And when the surface finally cracked, the only thing anyone could see was the rush for the exits.

The question is not whether it will happen again. The question is whether, next time, anyone will be slow enough to get caught holding the bag — or whether the lesson of Archegos has made every bank so fast that the unwind itself becomes the catastrophe.