About the project
Who makes GestorLens, and why
Who makes GestorLens
Cristian Díaz
I am Cristian Díaz, a physician by profession with a passion for financial markets. I have followed and traded the markets actively since 2015. My background was first centred on technical analysis, the discipline I specialised in and on which I gave courses in Argentina.
Over time my interest widened to fundamental analysis and, above all, to studying the decisions of the great fund managers: how they build their portfolios, which companies they invest in and how they change their positions over time.
GestorLens is a personal, independent project born from that curiosity and from the need to turn a large amount of public financial information into analysis tools that are actually useful.
I develop GestorLens independently. The platform collects, organises and presents information from public regulatory sources to make it easier to research. There is no investment firm and no team of financial advisers behind the project.
Why GestorLens exists
The idea for GestorLens came when I started exploring the platforms that let you look up the 13F forms filed with the US SEC. I found an enormous amount of valuable information, but I noticed that the raw data, scattered across documents, tables and websites, did not help me enough to interpret what I was looking at or to make better-founded investment decisions.
I wanted more than a list of positions: I wanted to compare managers, spot the relevant changes in their portfolios, see where their moves overlap and differ, and relate that information to the fundamental analysis of the companies.
So I assessed the technical feasibility of the project and the value it could bring to people who research the markets. In the end I decided to build GestorLens: a platform that turns complex public financial information into data that is organised, comparable and easy to explore.
The goal is not to copy the great investors automatically or to turn their moves into recommendations, but to offer a clearer, more transparent and more useful starting point for each user to develop their own judgement.
Before publishing the site I measured whether copying these investors works, with 129,534 cases from 2013 to 2025. The short answer is that, done blindly, it does not. Read the study →
What it is and what it is not
- It is a financial research tool for exploring public information about great managers and companies, with reference to the original documents.
- It is a way to organise, compare and put data in context to support independent analysis.
- It is not personalised financial advice or a recommendation to buy, sell or hold securities.
- It is not a source of real-time positions: 13F forms are published with a delay and have coverage limitations.
- It is free to access, with features available at no cost. A GestorLens PRO version is coming soon with additional features for users who want to take their analysis further.
Where the data comes from
- managers with a Q2 2026 13F portfolio
- 8,931
- concentrated managers with a Q2 2026 portfolio
- 703
- filers with any 13F since 2013 (including those no longer filing)
- 16,579
- quarterly portfolios processed since 2013
- 414,776
- well-known investors with their own page
- 47
- insider transactions (Form 4)
- 227,528
- 13D and 13G filings (above 5%)
- 58,552
- companies with up-to-date financials
- 5,673
Everything comes from EDGAR, the public system of the US SEC: Form 13F (quarterly portfolios, since 2013), Schedules 13D and 13G (stakes above 5%), Form 4 (insider transactions), 8-K and the financial statements companies file in XBRL. Every figure on the site comes from one of those documents, and how each thing is calculated is in the methodology.
Limits of the 13F. It is filed up to 45 days after each quarter ends and only shows long positions in US-listed stocks: it does not include short positions, bonds or cash, and the portfolio may have changed since. The site does not use market quotes. What a 13F is.
Data updated on November 5, 2026 · latest complete quarter: portfolios as of June 30, 2026. Official source: EDGAR (sec.gov).
GestorLens PRO, coming soon
I am preparing a PRO version with new tools to go deeper into the analysis of managers, portfolios and companies. It has no date or price yet.
What is free today stays free for anyone who already has an account.
If you already have an account, your Home has an “I'm interested in PRO” button to tell me what you would like it to have. There is no waiting list and I will not write to you about it.
Citing or using the data
You may cite any figure on the site by mentioning GestorLens and linking to the page it came from. If you are a journalist or write about markets and need a specific figure, write to me.
Source: GestorLens (gestorlens.com), with SEC data.
The download files and the study are published under CC BY 4.0: they may be used and redistributed with attribution. What it covers and what it does not is in the data licence.
Conflicts of interest
I am a private investor: I may hold, buy or sell stocks shown on the site, and I do not publish my portfolio.
I do not trade on information the site has and the public does not: everything comes from documents that are already public at the SEC. I receive no payments from companies, managers, brokers or other intermediaries, and nobody can pay to be listed or to change position in a list.
GestorLens is for information and research purposes. The data comes from public documents and may be subject to delays, omissions or errors. The content is not personalised financial advice or an investment recommendation. Each user should do their own research before making decisions. The identification of the site's owner is in the terms of use.