A different financial system has quietly emerged somewhere between the glassed-in trading floors of Manhattan and the polished marble of the Federal Reserve. Deposits are not accepted. There are no tellers there. The majority of people were unable to identify a single company within it. However, by some metrics, it now has more control over credit than the regulated banking industry. You wouldn’t know what private credit funds do if you passed their offices in Midtown. In a sense, that’s the point.
Paul McCulley first used the term “shadow banking” in 2007, right before the world discovered what shadows could conceal. He used it at Jackson Hole, the annual conference of central bankers in the Wyoming mountains where ideas circulate as much in the Lodge’s bar as in the conference room. It covered a small portion of US finance at the time, including money market funds, conduits, and structured investment vehicles. The Financial Stability Board now employs a far more expansive definition, and the results are shocking. Approximately half of the world’s financial assets are currently held by non-bank financial institutions. It’s not a sideshow. The show is that.
| Field | Detail |
|---|---|
| Subject | Global shadow banking system and the post-2008 regulatory reform agenda |
| Origin of the term | Coined by economist Paul McCulley in a 2007 speech at the Kansas City Fed’s Jackson Hole symposium |
| Estimated current size | Roughly $250 trillion in non-bank financial assets globally, by FSB tracking |
| Main activity | Credit intermediation outside traditional, deposit-funded banks |
| Core risk | Maturity and liquidity transformation without central bank backstops or deposit insurance |
| Key players | Money market funds, private credit funds, hedge funds, REITs, securitisation vehicles, insurers |
| Primary regulators tracking it | FSB, BIS, IMF, Federal Reserve, ECB |
| Latest warning | April 22, 2026 commentary by Agustín Carstens, Stijn Claessens and Klaas Knot |
| Reference reading | Brookings testimony on ending too-big-to-fail |
| Status of post-2008 reforms | Implementation described by senior officials as stalled or incomplete |
The startling thing is how much of this sounds familiar. Agustín Carstens, Stijn Claessens, and Klaas Knot warned of a “perfect storm” coming together in a recent commentary published on April 22, 2026: rapid expansion in non-bank finance, rising public debt in major economies, and post-2008 reforms that were never fully implemented. The kind of polite alarm that central bankers allow themselves when they want the rest of us to pay attention is evident when you read it. They imply that the window of opportunity to take action is closing.
It’s difficult not to recall Michael Barr’s testimony before Congress in 2011, when the wounds from Lehman were still raw. He discussed regulatory checks and balances, the migration of risk outside the supervised perimeter, and the use of legal loopholes to conceal leverage. It feels weird to read it now. No one would notice if many of the same sentences were filed today. By most measures, the regulated banks are stronger now than they were. There is more capital. Stress tests are commonplace. However, tightening one aspect of the system does not eliminate risk. It shifts.
Additionally, it has expanded into open-ended bond funds that promise daily redemptions on assets that don’t trade on a daily basis, private credit funds that chase yield, and pension funds that use leveraged strategies that momentarily crashed the UK gilt market in 2022. On its own, each piece appears doable. Together, they exhibit the characteristics that characterized the shadow banks of 2008: short-term borrowing, long-term lending, and the absence of a central bank to support them during tense times.
Most investors seem to think that the regulators are in control of it. That confidence seems more difficult to defend in light of the constant stream of warnings coming from Basel and Washington. The IMF highlights weaknesses. Another report is released by the FSB. Officials deliver thoughtful speeches. Private credit then receives trillions more. The next crisis might not resemble the previous one. Seldom does it. However, the architecture has a recognizable outline and is opaque, interconnected, and lightly supervised.
Beneath all of this is a more subdued question that regulators dislike being asked. Do the regulations even permit anyone to intervene quickly enough if a significant shadow bank begins to fail tomorrow? Nobody seems to be completely certain. More than any one figure, it is this uncertainty that ought to cause us to pause.