What is a superinvestor?

“Superinvestor” is an informal title that has to be earned in public: a multi-decade, verifiable record of outperformance, usually built with a concentrated, low-turnover portfolio.

Where the word comes from (1984)

In 1984, Columbia Business School hosted a debate marking the 50th anniversary of Graham and Dodd’s Security Analysis. The efficient-market side argued that market-beating records are statistical noise — flip enough coins and someone lands twenty heads. Buffett’s response, later published as The Superinvestors of Graham-and-Doddsville, was an empirical counterpunch: he presented the audited records of value investors who all came from one “intellectual village” — students and colleagues of Benjamin Graham.

• Walter Schloss — 28 years of compounding well above the S&P, from a one-room office.
• Tom Knapp — Tweedy, Browne’s deep-value partnership record.
• Bill Ruane — the Sequoia Fund, launched for Buffett’s own partners in 1970.
• Charlie Munger — concentrated, volatile, and far ahead of the index over 14 years.

Buffett’s point was not that these records were miracles — it was that they shared a single explainable method: buying businesses for less than their appraised value. If the records were luck, they would not cluster in one intellectual lineage.

What the word means today

Modern usage is broader than the Graham-and-Dodd village. When investors talk about “tracking superinvestors” today, they usually mean a few dozen institutional managers with three things in common:

• A long, audited record — typically 15+ years of public performance, across at least two full market cycles.
• Concentration — portfolios where the top 10 positions carry real weight, so each disclosed holding reflects a deliberate judgment rather than index padding.
• A traceable paper trail — they manage enough US equity (over $100 million in 13(f) securities) that the SEC requires quarterly disclosure of their long book.

How superinvestors are tracked in practice

The entire modern practice rests on one SEC form. Institutional managers exercising discretion over $100 million or more in 13(f) securities must file Form 13F within 45 days of each quarter-end, listing their US long positions. That single requirement makes it possible to reconstruct — four times a year — what Buffett, Klarman, Ackman, Li Lu, or Tepper actually own.

The same mechanism defines the limits of tracking. A 13F shows no short positions, no foreign-listed holdings, no cash, and no cost basis — and it is at least 45 days stale on the day it becomes public. Anyone presenting 13F data as a real-time copy-trading feed is overselling it; see the copy-trading myth.

How HoldLens curates its cohort of 30

There are thousands of 13F filers; following all of them is noise. HoldLens tracks a fixed cohort of 30 managers selected on the superinvestor criteria above: multi-decade records, genuinely concentrated books, low turnover, and clean 13F traceability. Every quarter, their filings are parsed and aggregated into the ConvictionScore — a descriptive −100 to +100 measure of net cohort buying or selling per stock. It describes what the cohort did; it is not a recommendation of what anyone should do.

Our view

Not investment advice. Historical records summarized from Warren Buffett’s 1984 essay “The Superinvestors of Graham-and-Doddsville” and SEC Form 13F guidance; verify against the primary sources linked above. See methodology for how the HoldLens cohort is selected and scored.