Key Points
-
Interactive Brokers has been an incredibly fast-growing asset-gathering machine, crossing 4.6 million client accounts in February.
-
With an elite 79% pretax profit margin, the company turns incremental account growth into outsize bottom-line gains.
-
The stock isn’t cheap. But it’s probably worth paying up for.
Shares of Interactive Brokers (NASDAQ: IBKR) took a 6% hit this week.
For recent buyers, the sudden drop might feel like whiplash. But zooming out tells a vastly different story. Long-term investors are sitting comfortably on massive gains. The electronic brokerage firm is up more than 200% over the last three years, easily crushing the broader market’s returns.
Will AI create the world’s first trillionaire? Our team just released a report on the one little-known company, called an “Indispensable Monopoly” providing the critical technology Nvidia and Intel both need. Continue »
With this context, does a 6% pullback offer a rare entry point into a compounding machine, or is the stock finally running out of steam after a massive multi-year run?
At a market capitalization of roughly $113 billion as of this writing and a price-to-earnings ratio of 30, expectations are high. But I think it can live up to those expectations over the long haul.
A chart showing a stock price rising sharply over time.
Image source: Getty Images.
A relentless asset-gathering machine
Scanning the latest primary disclosures reveals a clear, decisive mechanism behind this stock’s remarkable three-year run: Interactive Brokers is vacuuming up accounts at a blistering pace.
In its February 2026 monthly metrics update, the company reported 4.646 million client accounts, representing a 31% year-over-year increase. This sustained pace builds on a record-breaking 2025, when the company added over 1 million net new accounts in a single year for the first time in its history.
More importantly, total client equity in February — the lifeblood of any brokerage — jumped 40% year over year to hit $820 billion. This marks a notable acceleration from the 37% year-over-year growth rate the company posted at the end of 2025, when client equity sat at $780 billion.
This is the decisive variable for investors. While trading volumes can fluctuate with market volatility, the steady accumulation of customer accounts and client equity provides a steady (and growing) foundation for future revenue.
This influx of new money doesn’t just sit idle. It directly feeds the company’s highly automated brokerage, which leads to the second half of the bull case for the stock.
An automated cost structure
The defining trait of Interactive Brokers is its ruthless, technology-first, highly automated operating model with an emphasis on low costs — and this is showing up in the company’s bottom line.
In Q4, the company posted an exceptional pre-tax profit margin of 79% — up from 75% in the year-ago period. This operational leverage (the ability to grow revenue faster than operating costs) means that almost every new dollar of revenue flows directly to the bottom line. When customer equity grows, the costs to service that equity barely budge.
How does this translate to the company’s bottom line? Interactive Brokers reported fourth-quarter 2025 non-generally accepted accounting principles (non-GAAP) earnings per share of $0.65 per share — up 27% year over year.
Advertisement
This performance is “the direct result of our focus on empowering clients through low trade and margin pricing and less drag from costs,” said Interactive Brokers managing director Nancy Stuebe during the company’s fourth-quarter earnings call.
Over time, this structural advantage attracts more professional and active traders, which leads to more trading and more commissions. In February, Interactive Brokers’ Daily Average Revenue Trades (DARTs) climbed 21% year over year to 4.366 million. While impressive, this notably actually represents a deceleration from the 27% year-over-year volume growth the company saw in January, highlighting how trading activity can ebb even as assets grow.
Why this is my top growth stock idea in March
Of course, this is not a cheap stock at 30 times earnings. And after reviewing the company’s underlying business momentum, you wouldn’t expect it to be cheap.
A valuation like this presents risks. If customer account growth decelerates materially, or if an unexpected shift in the interest rate environment severely compresses Interactive Brokers’ net interest income, the stock’s premium multiple will likely contract.
In addition, given the stock’s ties to the market and all the noise that comes with that, the stock will likely be volatile.
But for investors willing to embrace the risks, look past any near-term noise and focus on the sheer volume of assets migrating to the platform, this week’s roughly 6% pullback looks like a genuine opportunity to start a small position in the stock — and possibly add to it on any bigger pullbacks.
Overall, the company possesses a structural cost advantage that competitors cannot easily replicate, and it is aggressively turning that advantage into greater market share.
Investors buying here are paying a premium, but they are paying for one of the highest-quality execution engines in the financial sector.
Should you buy stock in Interactive Brokers Group right now?
Before you buy stock in Interactive Brokers Group, consider this:
The Motley Fool Stock Advisor analyst team just identified what they believe are the 10 best stocks for investors to buy now… and Interactive Brokers Group wasn’t one of them. The 10 stocks that made the cut could produce monster returns in the coming years.
Consider when Netflix made this list on December 17, 2004… if you invested $1,000 at the time of our recommendation, you’d have $534,008!* Or when Nvidia made this list on April 15, 2005… if you invested $1,000 at the time of our recommendation, you’d have $1,090,073!*
Now, it’s worth noting Stock Advisor’s total average return is 949% — a market-crushing outperformance compared to 192% for the S&P 500. Don’t miss the latest top 10 list, available with Stock Advisor, and join an investing community built by individual investors for individual investors.
*Stock Advisor returns as of March 7, 2026.
Daniel Sparks and his clients have no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Interactive Brokers Group. The Motley Fool recommends the following options: long January 2027 $43.75 calls on Interactive Brokers Group and short January 2027 $46.25 calls on Interactive Brokers Group. The Motley Fool has a disclosure policy.