Dataroma

What it is

Dataroma takes the quarterly 13F filings of 83 value-oriented managers, parses them, and presents each as a portfolio: holdings with percentage weights, the quarter's buys and sells, and a per-position history table. Berkshire Hathaway, Baupost, Pershing Square, Himalaya, Fundsmith, Oakmark, Tweedy Browne, Giverny, Pabrai and the Gates Foundation trust are all in there, next to several one-person shops most trackers do not carry.

Four views sit above the individual portfolios. The Grand Portfolio aggregates every tracked manager into one holdings table; the S&P 500 Grid sorts the index by how many of them hold each name; Activity lists every buy and sell across the whole set. RealTime is narrower and more useful than its name suggests — the Form 4 filings made by tracked managers who are themselves insiders or ten-per-cent holders, and the only part of the site that is not a quarter old.

A separate Insider section is a general Form 4 screener — window from a day to two years, purchases or sales only, ten-per-cent holders only, preferred stock only, a minimum transaction size and a watch list of up to fifteen symbols.

Pricing

Free, with nothing to buy. No account, no paid tier, no donation ask, no newsletter upsell. Google AdSense pays for it, the same arrangement as OpenInsider, and it carries the same implication: there are no customers, so there is nobody the operator owes anything to.

Data & coverage

US 13F filings and US Form 4 filings, and nothing else — no foreign filings, no congressional disclosures, no fundamentals, no options chains. Quote data on the holdings pages comes from Intrinio, which supplies the current price, the 52-week range and the gain or loss against the reported price; the filings themselves are Dataroma's own parse.

History is the quiet strength. A position page such as Berkshire's Coca-Cola holding runs quarter by quarter from Q4 2006 to Q2 2026 with shares, portfolio weight and reported price for each — twenty years, on a free site with no login.

The Q2 2026 portfolios appeared between 10 July and 24 August 2026, most of them on 12 to 14 August, which is the 13F calendar rather than a Dataroma delay. Two entries have not moved with the rest: Scion Asset Management is marked updated 3 November 2025 and Makaira Partners 15 May 2026. Share counts are retroactively split-adjusted, and the percentages describe the stock portion of a portfolio only: cash, bonds and anything not reportable on 13F are absent. Commentaries, a curated feed of articles and manager letters, runs a few dated items a day.

Integrations

None, deliberately. No API, no export, no add-in, no MCP server. The one feed is RSS, and it carries portfolio-update announcements rather than data. The terms of service prohibit republishing, reproducing, redistributing or selling the content, while explicitly allowing short quotations that cite Dataroma and link to the page — which is a clearer permission than most free sites in this category give.

Limitations

• The list of investors is somebody's judgement. 83 managers are tracked because Dataroma considers them value-oriented and long-term. There is no stated threshold and no way to reproduce the selection, so anything you aggregate across the set — the Grand Portfolio, the grid, the consensus counts — inherits that choice.
• 13F's blind spots are all here. Shorts are not reported and must not be netted, written options and non-US listings are excluded, small holdings can be omitted, and filings land up to 45 days after quarter end. Several of the managers listed run concentrated books whose interesting half is outside the filing.
• Nothing leaves the site. No CSV, no API, and terms that forbid redistribution. For a research pipeline this is a reading site, not a source.
• Nobody is named. There is no about page and no named operator — a contact form, terms and a privacy note are the whole of it. A free site with no paying customers can change or stop without notice.
• It is not neutral about what it is for. The masthead reads "Invest Alongside Superinvestors" and the help notes are written as advice on how to read the data. Those same notes say a reader should evaluate a security independently rather than follow the managers blindly, and the terms state that nothing here is a recommendation. Take the framing as the site's editorial voice; the tables underneath are filings.

Alternatives

WhaleWisdom covers every 13F filer rather than a chosen 83, goes back to 2001 and has an API, but charges for the history and ranks funds as candidates to copy. Quiver Quantitative sells 13F as one of a dozen disclosure datasets over REST. OpenInsider is the same free-and-account-free shape for Form 4 alone, with a far deeper filter set. GuruFocus wraps a similar roster of managers in thirty years of fundamentals and its own scoring. The rest of the category is at insider, 13F and congressional trade trackers.