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Thomas Peterffy

Founder, IBKR

In the role
Jan 1993 – present
Birth date
30 September 1944 No source recorded here yet
Birth time
Unknown. A reading is issued only when it holds whichever hour Thomas was born.

2026 reading

Even

0 signals, 0 drags

Read for the calendar year from the birth date, one of five levels. Signals lift it, drags lower it. The rules stay in-house.

In Thomas’s 19 years leading IBKR, Even years rose 5 of 7.

This month
October is a quiet month. Next Active month: November. This month’s lists
2027
Published 1 December 2026, sealed before the year starts.

2026 month by month

Active months are the six in which a year’s reading tends to show in the stock. A qualifying reading enters the Rebound list in an Active month that follows a month the stock did not rise. The outlined cell is this month; the move is the month’s price change.

Years in role by level

Strong
2 of 2 rose
Firm
4 of 9 rose
Even
5 of 7 rose
Soft
0 of 1 rose
Weak
none

All leaders, 1995–2025: Strong 76% of 256 · Firm 71% of 709 · Even 67% of 2,016 · Soft 59% of 310 · Weak 50% of 191.

Year by year

Every calendar year Thomas led IBKR with a reading on record, and what the stock did that year. Past years are read with the rules now fixed; the return is the stock's from January to December.

IBKR rose in 11 of 19 years.

Thomas Peterffy at IBKR, by year
YearReadingStackedIBKRResult
2025Firm1 signal, 0 drags+46.2%Rose
2024Even0 signals, 0 drags+114.4%Rose
2023Firm1 signal, 0 drags+15.1%Rose
2022Firm1 signal, 0 drags−8.3%Fell
2021Firm1 signal, 0 drags+31.1%Rose
2020Strong2 signals, 0 drags+31.7%Rose
2019Soft0 signals, 1 drag−14.0%Fell
2018Even1 signal, 1 drag−7.1%Fell
2017Even1 signal, 1 drag+63.8%Rose
2016Firm1 signal, 0 drags−15.3%Fell
2015Even0 signals, 0 drags+51.1%Rose
2014Even0 signals, 0 drags+21.8%Rose
2013Firm1 signal, 0 drags+82.1%Rose
2012Firm1 signal, 0 drags−5.9%Fell
2011Firm1 signal, 0 drags−5.7%Fell
2010Strong2 signals, 0 drags+0.6%Rose
2009Firm1 signal, 0 drags−0.9%Fell
2008Even0 signals, 2 drags−44.6%Fell
2007Even0 signals, 2 drags+26.8%Rose
Readings
One of five levels a year, with how many signals and drags stacked, computed from the birth date over the thirteen possible birth hours and issued only where at least ten agree. Built 2026-10-16 from research export f0c9e40. The rules stay in-house.
Stock data
Calendar-year and monthly % change of adjusted close. Volatility % = annualised stdev of the 12 monthly returns. No prices are included. Adjusted close is split-adjusted, so a stock split never appears as a move in anything plotted here, and stock splits are not recorded as events.
Birth dates
206 of the 319 people in this dataset now have at least one source recorded here, across 207 of the 325 leader-company records — six people ran two companies and are stored once for each. Of those sources — all 207 of them — 204 are a stated age read out of an SEC proxy statement, which bounds a birth year and says nothing about the day; one is an age stated in a press report; two state the day itself, one from an official gazette read by a person and one from an encyclopedia. The day is what every reading on this site is calculated from, so for all but those two birth dates no source here backs the part that is used. The 204 records the pass produced were not reviewed by a person: each source names who read it. Six findings from the same pass are deliberately not entered, because in each one the date held here falls outside the bound the filing implies, and telling an ordinary record-date lag from a real disagreement needs a person rather than arithmetic. An absent entry still means no source is recorded here yet.
Research export
Version 2, generated 2026-10-16 from research commit 7d490ef with uncommitted changes

Research and exploration only. Not investment advice. A reading describes a leader's year from their birth date, not the stock.