Imagine you’re deciding where to invest your savings. All $36 to be precise. You pull up the data on a company, looking at its stock price and, just as importantly, its trading volume. High volume suggests a lot of interest, a liquid market. It gives you confidence. You rely on that data to be real.
You trust the system and ape all 36 buckaroos into the stock.
But what if I told you that for three years, part of that system was a mirage? An illusion!
From the heart of New York, a financial firm called XP Investments US, LLC was broadcasting phantom trades to the world. A technical glitch in their software was inadvertently creating ghosts in the machine—nearly half a billion of them. And for years, it seems nobody in a position of authority was even looking.
A Glitch in the Code, A Chasm in Oversight
Here’s how it happened. Between June 2019 and June 2022, XP Investments used an automated system to advertise its trading activity on Bloomberg, a data service that is the lifeblood of financial professionals everywhere. But the system had a fatal flaw.
When a trader made a change to an existing order, the software didn’t just update the trade—it counted it twice. The original order and the modified one were both blasted out as separate, bona fide trades.
One trade became two. A simple software bug, perhaps. But this bug ran wild. It resulted in the firm overstating its trading volume in about 3,300 instances. The grand total of this phantom activity? A staggering 446 million shares that were never actually traded as advertised.
A simple mistake, you might say. But the real story isn’t about a software bug. It’s about the lack of human oversight.
The problem festered for three whole years before the Wall Street firm replaced the system in July 2022. Even worse, for over four years—from June 2019 all the way to December 2023—XP had no supervisory system in place to check the accuracy of the data it was pumping into the market. Nobody was assigned to make sure the numbers were real. The machine was running without a driver.
The Ripple Effect of a Lie
So what? Who gets hurt by a few extra numbers on a Bloomberg terminal? All of us do.
Accurate market data is the foundation of a fair market. It’s what separates investing from gambling. When a firm inflates its trading volume, it creates a false impression of its size and influence. It distorts the picture of supply and demand for a security. It misleads every other investor, analyst, and trader who believes they are making decisions based on facts.
This here be about violating a fundamental trust. FINRA, the financial industry’s own regulator, has rules demanding that firms “observe high standards of commercial honor and just and equitable principles of trade”. Pumping 446 million phantom shares into the market data stream is a direct assault on that principle. It erodes the very bedrock of faith that our financial systems depend on to function.
A System of Slaps on the Wrist
This isn’t just one company’s story. It’s a snapshot of a system where accountability often feels like an afterthought. When a company can broadcast false information for years simply because nobody was tasked with checking the work, it reveals a profound weakness in the industry’s culture of compliance. The focus is on the transaction, not necessarily its integrity.
And what was the price for this multi-year failure that warped market data by hundreds of millions of shares? A censure and a fine of $185,000.
Let’s be real. For a Wall Street financial firm, this is basically just the cost of doing business. It’s a rounding error. As part of the settlement, XP Investments doesn’t even have to admit or deny FINRA’s findings. The slate is wiped clean with a check, and no individual is held accountable. The message this sends is chilling: the penalty for polluting the public stream of market data is negligible.
Building a Market We Can Trust
Fixing a software bug after you get caught is the bare minimum. The real solution proactive, not reactive. It requires building robust, verifiable systems of oversight before a problem occurs, not years after the fact.
True accountability would mean penalties that are a genuine deterrent, not just a line item in an annual budget. It would mean that firms can’t just waive away wrongdoing without admission of guilt.
It would mean recognizing that the integrity of market data both an ethical and a technical issue. Until we demand a culture of accountability that matches the scale of the capital markets, we are all investing in a system that remains vulnerable to the next ghost in the machine.
All factual claims in this article are sourced from the Financial Industry Regulatory Authority (FINRA) Letter of Acceptance, Waiver, and Consent No. 2021072257301.
The FINRA source used to write this article can be found here: https://www.finra.org/sites/default/files/fda_documents/2021072257301%20XP%20Securities%20US%2C%20LLC%20CRD%20156691%20AWC%20lp%20%282025-1751674799296%29.pdf
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