Interactive Brokers Q3 Shows Sharp Commission Deceleration; Valuation Remains Rich

What happened

Interactive Brokers reported Q3 2026 revenue of $1.87 billion, slightly beating estimates, with EPS of $0.67 in line, but the headline numbers masked a sharp deceleration in commission revenue growth from 30% sequentially to just 12%. The slowdown was driven by lower stock trading volumes and a cooling options market, with only futures showing sequential growth, while the tailwind from strong IPO activity in Q2 faded as the IPO pipeline dried up. This result confirms the cyclical normalization risk that was central to the WAIT thesis, as trading activity and rate-driven revenue are inherently volatile and had reached unsustainable peaks. Despite the company's durable technology moat and global client base, the stock trades at roughly 21x trailing earnings, leaving limited margin of safety if activity and rates continue to moderate. The Seeking Alpha article's conclusion that the deceleration is likely temporary but that the stock lacks value is consistent with the existing cautious stance, reinforcing patience for a better entry point near $65.

Implication

The Q3 report provides tangible evidence of the normalization that the master report anticipated, with commission growth halving sequentially and activity drivers losing steam. This validates the thesis that market expectations for sustained high double-digit account growth and trading volumes are too optimistic, and that net interest income remains vulnerable to rate cuts. Given the stock's premium multiple of ~21x trailing EPS and ~1.7x book, the risk-reward is skewed negative at $75-76, and the article's view that the stock lacks value aligns with our WAIT stance. Investors should wait for either a pullback to the mid-$60s, which offers a more attractive margin of safety, or several quarters of evidence that activity and margins are structurally durable before considering a more aggressive position.

Thesis delta

The thesis remains WAIT, but the Q3 report adds weight to the bear case by showing commission growth deceleration from 30% to 12% sequentially. This confirms that trading activity is normalizing as the master report anticipated, reinforcing the view that current valuation embeds unrealistic expectations. No change to the rating or price targets is warranted at this time.