14 Conviction, measured

A Big Number From a Big Fund Is Not a Big Bet

Citadel bought $13 billion of stock last quarter and Bill Ackman bought $5.3 billion. Measured against the size of each book, Ackman made by far the bigger bet.

27.2%

of Pershing Square’s book put to work in three months. Citadel managed 1.5%.

New money put to work, as a share of the book Estimated, Q2 2026
  1. 01
    Situational Awareness

    Leopold Aschenbrenner · $8.27bn

    40.9%
  2. 02
    Pershing Square

    Bill Ackman · $5.29bn

    27.2%
  3. 03
    Coatue

    Philippe Laffont · $9.41bn

    19.3%
  4. 04
    Duquesne Family Office

    Stanley Druckenmiller · $738m

    14.2%
  5. 05
    Berkshire Hathaway

    Warren Buffett · $15.0bn

    5.0%
  6. 06
    Fisher Investments

    Ken Fisher · $8.53bn

    2.5%
  7. 07
    Citadel

    Ken Griffin · $13.0bn

    1.5%
  8. 08
    Renaissance Technologies

    Founded by Jim Simons · $958m

    1.3%

And two were net sellers. Bridgewater took $3.05bn out of the market over the quarter and Appaloosa $377m. Neither appears above, because there is no new money to measure.

Read it this way

$15bn

Warren Buffett

The most bought by anyone here but Citadel, and only 5% of his book.

1.5%

Ken Griffin

Citadel’s $13bn is the biggest headline and the smallest commitment on the page.

Price-stripped

This counts money actually moved. A holding that simply rose in value does not appear in it.

The dollar figure tells you how big the fund is. This tells you how much they meant it.