There’s an accusation that has been circulating in the serious corners of asset management for a few years now, sharpened mostly by Cliff Asness of AQR. It has a name that lands like a slap: volatility laundering.
The charge is simple and damning. Private equity reports smooth, orderly, almost serene return streams — and sells that serenity as proof of safety. Public equities are marked continuously; since 1926 the S&P 500 has run at roughly 19% annual volatility. Private equity, which owns unlisted companies, typically remarks its holdings only once a quarter. Because those valuations are infrequent, the returns look smoother, with lower reported volatility than public markets — which isn’t credible, given that these companies are on average smaller and more leveraged, and therefore more volatile, not less.
The risk didn’t shrink. Someone just stopped taking its picture. What was once honestly labeled a bug — illiquidity, pricing opacity — is now sold as a feature.
It’s a great subject. It offends a mass belief, it embarrasses a powerful industry, and no one inside that industry has any incentive to explain it to you.
I’m not going to write that edition. People better credentialed than me already have.
I’m going to write the one nobody writes: the one where you’re the launderer.
Here is the thing about volatility laundering that the private-equity fight obscures. It is not a moral failing of buyout managers. It is a mechanical consequence of how infrequently a price gets updated. And that mechanism does not care whether an asset is public or private.
The statistical footprint is always the same. When a price is stale — carried over from the last time anyone actually transacted — each new observed return is partly an echo of the previous one. Returns computed from stale marks are smoother, showing lower volatility and higher serial correlation than true economic returns. The academic name for the fingerprint is autocorrelation; the plain-English version is that today’s number is quietly holding hands with yesterday’s.
Notice what this means. You don’t need a private-equity fund to launder volatility. You just need an asset that doesn’t trade very often. And your public-market portfolio is very likely full of them.
Consider the thinly-traded small-cap or micro-cap you hold — the one you’re rather proud of, that sits quietly in the account not doing anything alarming.
On a given day, a small stock in the Russell 2000 may transact only a handful of times. Some skip entire sessions. When a broad shock hits the market, it is fully reflected in liquid names within seconds — and only partially reflected in the illiquid ones, because their last-printed price is hours or days old. The stock looks calm during the storm. Not because it isn’t exposed to the storm. Because nobody has repriced it into the storm yet.
The consequence economists have documented since the 1970s: betas estimated from infrequently-traded stocks are biased toward zero. Illiquid firms report lower betas than they truly have; the least-traded names have shown biases exceeding 50%. Your quiet holding is not low-risk. It is under-measured. Its serenity is a data artifact, the identical artifact private equity gets accused of manufacturing — except here, no manager did it to you. The market’s plumbing did it, and you accepted the reading.
This is the uncomfortable core of it. Confusing “no printed price” with “no risk” is the single bias underneath both stories. Private equity industrializes it. You do it by accident, to yourself, every time you glance at a sleepy position and feel reassured by its stillness.
The reassurance runs backwards. Asness’s own sharpest point is that investors don’t merely tolerate laundered volatility — they will pay for it. There is a real, human comfort in an asset that doesn’t smack you in the face with its price swings, even when the swings are genuinely there, hidden in the gaps between trades.
That comfort has a bill attached, and it always comes due in exactly the moment you can’t afford it. A stale price is most stale precisely when the market is moving fastest — because that’s when the gap between “last trade” and “true value” is widest. The calm holds right up until you need to sell, and then the whole deferred move arrives at once, at a price nobody warned you about. What looked like your steadiest position reveals itself as the one that was never being marked at all.
Now go do this on your own portfolio. Take the holding that has felt calmest over the past year — the one whose chart is a gentle slope while everything else zig-zagged. Then ask one question: is it calm because the business is stable, or calm because it barely trades? Pull its average daily volume. Pull its bid-ask spread. If the volume is thin and the spread is wide, you are not holding a low-volatility asset. You are holding a poorly-photographed one — and you have been doing your own volatility laundering, for free, and believing the result.
Most people find something they’d rather not know: that their “steady” holding was never steady. It was just quiet. And quiet is not the same as safe — it’s just the same as unmeasured.
The free half gave you the mechanism and the one-question test. Here is the toolkit — how to measure the laundering in your own book, strip it out, and act on what’s left.
The Staleness Screen — a working checklist. The four observable tells that separate a genuinely stable holding from a merely quiet one: average daily volume relative to your position size, bid-ask spread, the count of zero-volume days per quarter, and the “time-to-close” of the last trade. Each with the threshold that flips a name from stable to stale. Run it on every position in an afternoon.
How to un-launder a return — the desmoothing move, without the math degree. The one adjustment that recovers an asset’s true volatility from its reported one, why unsmoothing a marquee private real-estate fund cut its Sharpe ratio by roughly 30%, and how to apply the same correction to your own thinly-traded names before you trust a single risk number on your screen.
The position that taught me this — named, with the drawdown. The “steadiest” holding I ever owned, why its calm chart was the warning sign I read as reassurance, and the exact day the deferred volatility arrived all at once. Most letters show you the winners. This one shows you the mark that was never real.
The liquidity-comes-due rule. Why stale prices are most stale precisely when you most need to sell, the position-sizing rule that follows from it, and how to size a thinly-traded name so its hidden volatility can’t force your hand at the bottom.
Where the illusion is an opportunity. The flip side: when other investors’ stale marks create a real, exploitable gap — the secondary discounts and repricing lags where being the one who marks honestly is an edge. Three specific setups where the laundering works for you instead of against you.
Turning the lens on your funds. How to spot the same fingerprint inside the interval funds, semi-liquid vehicles, and “low-volatility” products now being pushed at retail investors — and the two questions that reveal whether a smooth line is stability or just an infrequent camera.
Public Markets is a Substack bestseller. The free editions are why people subscribe. The paid editions are why they stay.
The annual subscription is $300/year.
This week, and only this week, you can pay $500 once and get lifetime access.
The arithmetic isn’t subtle: it pays for itself in twenty months. If you intend to still be investing in five years — and if you’re reading a piece like this, you do — the annual price is the expensive option.
But the discount isn’t the real reason. The real reason is that this method rewards patience. The laundering you can’t see today is exactly the risk that surfaces years from now, in the one drawdown you didn’t size for. A framework built on seeing risk before it prints can’t honestly be sold as a one-year product.
You’re not buying a year of picks. You’re joining a long-term portfolio built in public — every position’s real risk measured before it matters, not after.
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