IBKR · Nasdaq · Security Brokers, Dealers & Flotation Companies

Interactive Brokers Group, Inc.

A research memo on Interactive Brokers: what it sells, the money one average account brings, Q3 2026 results, competitors, FY2027 bust/base/boom scenarios, a 31 Oct 2026 valuation with per-share values, leadership and governance, and the next dated test.

What we have on this company
Information	Status	As of
Detailed research report	Yes	2026-10-31
Rule-based screens	Scored, on no current shortlist	2026-10-31
Valuation	Below fair value · +14% to USD 87.60	2026-10-30
Chart-pattern read	No call (invalidated)	2026-10-30
Paper portfolio	Held since 2026-07-01	2026-10-30

Research

Detailed report · reviewed 2026-10-31 · financial baseline Q3 2026

A 78% margin compounding machine, priced for growth just as rates turn

Quality compounder, fairly priced on our base case. Q3 2026: accounts 5.58M (+35%), customer equity USD 964.7B, net revenues USD 1,914M (+16%), 78% pretax margin, dividend +71%. About 60% of revenue is net interest income, with about USD 83M lost per 25 bp Fed cut. At USD 76.90 (30 Oct close) the stock trades at 28.9x FY2026E EPS of USD 2.66. Scenario values USD 48 bust, 83.4 base, 119 boom; MarketBeat consensus USD 102.87 (18 analysts). Next hard test: Q4 2026 results, expected about 20 January 2027.

Reviewed 31 Oct 2026 · IBKR Mobile ratings pending

Read the full report →

Scores

Deterministic rule outputs, snapshot 2026-10-31 · price 76.90 on 2026-10-30. Not recommendations.

Method	Score	Inputs as of	Flags
Graham Defensive	42	2025-12-31	partial, missing 2,7 stale input
Magic Formula	n/a
Momentum	58	2026-10-30
Insider	n/a
Buffett Quality	50		partial, missing 4,5,6,7
Lynch GARP	64		partial, missing 4,6
Graham Enterprising	35		partial, missing 1,2,6,7
Piotroski F-Score	33		partial, missing 5,6,8

Every input with its filing: full score sheet · research packet (JSON) · Markdown · SEC filings.

Valuation

Research fair-value comparison · latest source 2026-10-30

Below fair value · +14% to USD 87.60

Average of the dated sources shown in the report, with the price chart. Open the fair-value section.

Charts

Chart-pattern read from a notebook citing Bulkowski's Encyclopedia of Chart Patterns · forecast data to 2026-10-30 · 2 runs kept

No call: the pattern is invalidated.

Open the chart → Forecast journal

Portfolio activity Paper

Simulated $50k paper account, not an investable fund · data as of the 2026-10-30 close

Held: 63.49 shares at an average cost of 85.41, 8.4% of the account, opened 2026-07-01; unrealized -9.96%.

Date	Action	Shares	Price
2026-10-15	BUY	35.21	83.00

See the position in the paper portfolio · all activity