The Most Active Super Investors of 2026

A 13F is a snapshot, not a diary. It tells you what a fund held on the last day of the quarter, and says nothing about the path it took to get there. But line two consecutive snapshots up beside each other and the difference is real information: what was opened, what was added to, what was cut.

This ranks every fund we track by how much of its book actually changed between its last two filings, for Q2 2026.

The funds that moved the most

What a high number here does and does not mean

A quantitative fund rebalancing thousands of small positions will sit at the top of a table like this every single quarter, and it tells you almost nothing about conviction. A concentrated value manager might make four changes a year, and each one is worth more of your attention than a thousand of the former.

So read the two columns separately, and read them against the size of the book:

• Opens and adds are the fund putting money to work. A new position is a decision to start; an add is a decision to double down on one already made.
• Trims are the ambiguous column. A fund reducing a position may have changed its mind, or may be taking profits, or may be meeting a redemption. A 13F cannot tell you which, and anyone who claims otherwise is guessing.
• Neither counts a full exit. A position that disappears entirely is not in a 13F at all: it is an absence, and we detect it by comparing the two filings ourselves.

The 45-day problem, which applies to all of it

A 13F is due 45 days after quarter end. So the most recent filing you can read describes a portfolio that is at minimum six weeks old, and up to four and a half months old by the time the next one lands. A fund that opened a position on day one of the quarter and sold it on day 89 will never appear to have owned it.

This is the honest limit on every 13F-based article on the internet, including this one. It does not make the data useless: for the long-horizon managers, a quarter is noise. It makes it useless for anything resembling a trade.

See every fund's filed book and quarter-on-quarter changes.

Educational information, not financial advice. Every figure on this page is read from the source filings when the page loads, not written into the article, so what you are reading is today's data and not a snapshot of the day it was published.