Buyers, particularly the monetary press, spend lots of time making an attempt to elucidate what simply occurred. The issue is that this train is stuffed with hindsight bias, causal assumptions, and narrative fallacy that don’t stand up to scrutiny.
Final week was an ideal instance of that. I wish to take a contrarian view of what occurred Thursday to suss out what we do and don’t know, and what might need been driving the entire volatility.
1. The Promote-Off
Thursday was one of the crucial important one-day sell-offs now we have seen in an extended whereas. The Philadelphia Semiconductor Index plunged 12%, with some names like SanDisk, AMD, Micron, and Marvell falling way more. Reuters famous it was the second-worst day for semiconductors on report.
The S&P 500 fell 4.4% — the worst drop for the reason that tariffs announcement in April 2025 (“Liberation Day”). The Nasdaq, which had hit an all-time excessive in October, fell ~12% beneath that mark. The Volatility Index mirrored this; the VIX noticed its third-largest share soar ever, gaining 69.7% because it leaped from 16 to over 28.
Maybe most important was Nvidia, which is now destructive for the yr. The heaviest weight within the S&P 500, it fell 9.3% that day. How extensively identified Jensen Huang’s now-publicized affair with a Chinese language Spy is undetermined.1
2. Unlikely Causes
The “Blunami”, a Democratic landslide victory on Tuesday, was nicely understood early election evening (November 3rd), nicely earlier than midnight. Regardless of the substantial rally the day after the election, a brand new narrative started by the tip of Thursday.
This was all identified on the day after the election (Wednesday, November 4th). It was a traditionally sturdy post-midterm election rally. Markets rose, and if you’d like a idea why, there have been lots: anticipation of an finish to the Iran battle, decrease fuel costs, decrease inflation – possibly even future fee cuts. After all, congressional gridlock is all the time a successful theme.
President Trump additionally stunned individuals by accepting the election consequence. The historic thumping was so nice, it will have been laughable to assert in any other case. Regardless of the cause, it led to the market’s greatest day in three months.
Thursday greater than erased these good points, but nothing new emerged from the election outcomes. Certainly, markets rallied onerous the following day (Friday) and, regardless of the Jensen Huang/Nvidia information, have been up strongly at midday immediately.
No important political information emerged between late Tuesday evening and now. This makes the dominant AP storyline appear like a lazy narrative fallacy, an try to suit the outcomes right into a superficial storyline. The AP timeline is mindless and strongly suggests the dominant Related Press narrative is bullshit.
3. Three Doable Causes
A number of potential drivers of the selloff resonate extra with me than the political narrative.
The primary was rumors a couple of compelled liquidation of knowledge heart loans. Bloomberg coated one facet of the story mid-day: “Thriller Vendor Places Up $500 Million Knowledge Middle Loans”; this aligns with a reversal in bullish sentiment. The following day, it was revealed that the vendor was ING.2
Given the lots of of billions already invested by the hyperscalers within the AI information heart buildout, half a billion {dollars} is a modest sum and shouldn’t be sufficient debt to trigger widespread panic.
Whereas I don’t imagine this was the trigger, generally, all it takes to ignite a room filled with flammable fuel is a small spark.
The second attainable offender was the rebalancing of the (too) fashionable leveraged ETFs of an estimated $50 billion.3 Dave Nadig of ETF.com places the every day rebal at ~$58 billion; he notes this doesn’t embody circulation, and that the day’s volatility provides to the magnitude (however is agnostic in regards to the course). The ETF rebal was extra seemingly a results of the sell-off, and never an underlying trigger.
The third potential trigger – and in my thoughts, the most important – was an enormous, leveraged development unwind by the key multi-strategy hedge funds. These pod outlets are stuffed with quants who often find yourself in crowded trades – this time, it was semiconductors and AI.
Rumors circulated that ~108 separate pods closed and unwound on Thursday in what’s greatest described as “compelled liquidations.” Which may assist clarify the quickest $2.5 trillion wipeout on report. (Word we noticed a considerably much less ugly selloff on the final buying and selling day of October).
For these unfamiliar with the time period “pod outlets,” these are multi-manager, multi-strategy hedge funds which have lots of of small, semi-autonomous buying and selling groups – aka “pods” – on the identical platform. Most of the best-known multi-strat funds run giant quantities of capital: Millennium ($98B), Citadel ($77B), Point72 ($55.5B), Balyasny ($37B), Schonfeld Strategic Advisors ($23.5B), Hudson Bay Capital ($20B), and many others. Add to that Viking and lots of different Tiger outlets, and all of it provides as much as a moderately sizeable quantity of capital.
The methods might differ, however one constant theme is centralized danger administration that aggregates all positions throughout each pod’s ebook in actual time. Final Thursday felt (no less than to me) like many of those pods obtained caught in a crowded, systematic,long-leveraged development fairness commerce. Suppose mega-cap development, momentum, and tech names, particularly AI/Semis.
The multi-strat outlets are disciplined, mechanical, and formulaic. Any pod that hits a selected drawdown restrict triggers a tough cease robotically. 
Once I seek advice from compelled liquidation, that is exactly what I imply.4
Are you able to inform upfront when a sell-off may happen? Because the market developments upward, the leverage doesn’t get a lot discover. I might surmise it’s near unimaginable to guess when quakes of this kind may happen or when you may sound the all-clear whistle. We by no means actually know simply how crowded a commerce may be till the unwind. (See JPM report at proper as a counter-example of the hazards of assuming it was protected).
My guess is that Citadel Securities and Jane Avenue have been the counterparties to an enormous unwind, just like the Situational Consciousness commerce over the summer time. We are going to discover out if that suspicion is true as quickly as rumors of windfall buying and selling earnings in November for these two companies start to flow into.
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Was the catalyst political? I extremely doubt it; Wednesday’s rally was lengthy after the Blue Tsunami was understood. The way more seemingly trigger was compelled liquidations of a crowded quant/momentum commerce pushed by tightly run danger administration at pod outlets.
Cliff Asness defined a decade after the 2007 Quant Quake, “Crashes are runs on the financial institution and it’s very onerous, even for genius physicists, to foretell social panic, not to mention the magnitude of 1 versus one other.”
Some classes from these experiences apparently turned systematic buying and selling guidelines, too…
Beforehand:
7 Shocking Market Knowledge Factors (after immediately’s selloff) (October 30, 2026)
5 Steps to Take Proper Now (October 12, 2026)
__________
1. NVDA was down 2.6% YTD earlier than the information broke final evening, sending it ~5% decrease pre-market immediately. For some context, the prior three years noticed good points of 39%, 171% and 239%.
By the tip of the day, it was a lot worse: NVDA ended Monday, November ninth, down ~25% from its October 5, 2026 highs….
2. Right here is Bloomberg on the sale:
“Dutch financial institution ING is trying to promote roughly $500 million of knowledge heart loans as fears that the Democratic sweep in US midterm elections may stall many such tasks triggered a market rout.
The lender is taking gives for a dozen loans through a so-called bids-wanted-in-competition course of, in response to individuals aware of the matter, who requested to not be recognized as a result of the data is personal. The loans on the market within the uncommon public sale embody a $25 million slice backing a large information heart web site in New Mexico, a part of OpenAI, SoftBank Group Corp. and Oracle Corp.’s joint Stargate undertaking. Oracle has despatched the developer a discover citing pressure majeure.”
3. One other estimate:
“Nomura estimated that these funds would wish to promote roughly $47 billion into Thursday’s shut—probably the second-largest quantity in its data courting to July 2006. That creates a suggestions loop: falling costs set off rebalancing gross sales, including additional strain. This was an intraday estimate of required promoting, not a verified remaining circulation determine.”
4. The WSJ reported:
“Hedge Funds Dump Positions and Minimize Employees as Selloff Deepens” Final month had highest fee of stock-picking funds unwinding positions in over a decade; Samlyn, Engineers Gate and Walleye reduce workers
Word this was referring to October, and never final Thursday’s sell-off.
