Why Interactive Brokers Stock Zoomed 35.3% Higher In The First Half of 2026
Shares of Interactive Brokers rose 35.3% in H1 2026, driven by a 31% jump in customer accounts to 4.75 million and a new direct link to South Korean markets. The brokerage reported 77% pre-tax margins.
Interactive Brokers (NASDAQ: IBKR) shares surged 35.3% during the first six months of 2026, according to S&P Global Market Intelligence data, as the brokerage continued to ride a wave of international expansion and robust trading activity.
Growth Drivers
Customer accounts grew 31% year-over-year to 4.75 million in the first quarter of 2026, a key leading indicator of future revenue. The company attributed much of its recent growth to a direct market connection launched in South Korea, giving clients worldwide the ability to trade the country’s stocks—a feature most competitors do not offer.
Commission revenue rose 19% year-over-year in Q1, driven by equities, options, and cryptocurrencies. Net interest income increased 17% during the same period. Interactive Brokers maintains one of the highest profit margins in the industry, with a pre-tax margin of 77% in the first quarter.
Valuation and Outlook
The stock now trades at a price-to-earnings ratio of 41, up from roughly 20 in 2022–2024. Over the trailing five years, shares have gained about 500%. While the company’s long history of customer acquisition and strong earnings growth supports the higher multiple, investors expecting another 35% annual return may be disappointed. Nevertheless, if account growth and profitability remain on track, the stock could still deliver solid long-term returns.
Source: Interactive Brokers