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Portia International

Built inside a working ABA clinic, and still owned by the family that runs it.

The short version

Clinic founded
20061
Headquarters
Not published4
Ownership
Karen McArthur is a co-owner2
Chief executive
Karen McArthur2
Money raised
None disclosed3

Portia is the clearest example in this directory of software written by the people who had to use it. It was developed inside The Portia Learning Centre, an ABA clinic founded in 2006, by the McArthur family working with the clinic's own behavior analysts.1

That arrangement still holds. Karen McArthur is chief executive of both the software company and the clinic group, which means the product's roadmap is set by someone who also runs a practice on it.2

There is correspondingly little corporate history to report. We found no investors and no change of control, but the search that establishes this is a US securities database, and a Canadian private company would never appear in it. Treat the absence as weak evidence.3

How it got here

2006
The Portia Learning Centre, an ABA clinic, is founded.2
2012
Co-ownership of the software business is dated to this year by the company.2
Today
Karen McArthur remains chief executive of both the software company and the clinic group.2

Money and ownership

WhatAmountDetail
Outside investmentNone foundNo US securities filing exists — but Portia International is Canadian and would not be required to file one, so this is weak evidence rather than proof.3
Size, as the company reports it self-reported figures by year
As ofReported
—No customer, user or revenue figure has been published1
What we could not confirm 4 open questions
  • The founding date of the software business itself is not published; only the clinic's 2006 founding and a 2012 co-ownership date are stated.2
  • Where Portia International is based is not published on any of its own pages — they give a toll-free number and describe a North American support team, nothing more. The clinics are in Ontario, but that locates the clinic group, not the software company.4
  • Which family members beyond Karen McArthur hold ownership, and in what proportions, is not published. Her own biography says only that she is a co-owner.2
  • No scale figures of any kind have been published.1

Sources

  1. Portia International — Aboutaccessed 1 Aug 2026
  2. The Portia Learning Centre — About usaccessed 1 Aug 2026
  3. SEC EDGAR — no Form D filings for Portia Internationalaccessed 1 Aug 2026
  4. Portia — contactaccessed 1 Aug 2026

Related

Portia International in the directory What it does, what it costs, who it suits, and the alternatives NoteableThree founders, thirteen years, and no outside investment we could find.NPAWorks (CodeMetro)One of the oldest products in ABA, and one of the least documented.
How we researched this. Every numbered citation above links to the document it came from — a company or investor announcement, a regulatory filing, or a government business register. Funding aggregators were used only to find those documents, never as a source for a figure: where a widely repeated number has no traceable origin, we leave it out and say so. Nothing on this page is estimated or inferred. Something wrong or out of date? Send a correction.