Whale Analyzer
Top public holders · 13F and disclosure aggregation

Who owns MCO? 13F holders and whale ownership

MCO is tracked across public portfolios in Whale Analyzer. This page answers who owns MCO, which top funds are buying MCO, aggregate disclosed value, and recent position changes based on public data.

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10Tracked holders
$19.15BAggregate reported value
2026-05-19Page updated
4 increased, 3 held, 2 reduced, 1 newRecent changes

Top holders

InvestorReported valueSharesChange
Warren Buffett 13F portfolio
Berkshire Hathaway holdings
$10.76B24.7MHeld
Chris Hohn 13F portfolio
TCI Fund Management holdings
$6.25B14.3MIncreased
Dev Kantesaria 13F portfolio
Valley Forge Capital Management holdings
$574.6M1.3MReduced
Chuck Akre 13F portfolio
Akre Capital Management holdings
$543.6M1.2MReduced
Altarock Partners 13F portfolio
Altarock Partners holdings
$376.1M862.0KIncreased
Baillie Gifford 13F portfolio
Baillie Gifford & Co holdings
$333.4M764.3KIncreased
Al Gore / David Blood 13F portfolio
Generation Investment Management holdings
$159.8M366.4KIncreased
Tom Gayner 13F portfolio
Markel Group holdings
$93.3M213.9KHeld
Li Lu 13F portfolio
Himalaya Capital Management holdings
$51.4M117.8KNew
Guy Spier 13F portfolio
Aquamarine Fund holdings
$11.8K27.0KHeld

How to read this page

Values are reported public positions from tracked investors and institutions. They are not real-time ownership totals for the company.

This page is generated from public filings and public disclosures. It is for research and education only and is not investment advice.

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Frequently asked questions

Who owns MCO stock?

Whale Analyzer tracks 10 public institutional holders of MCO with a combined reported value of $19.15B. See the holder table above for the largest tracked positions.

Which top funds are buying MCO?

Check the "Change" column in the holders table above. "New" means a fresh position was initiated, "Added" means an existing position was increased, and "Reduced" or "Sold" indicates trimming.

What does 13F ownership mean for MCO?

Use the interactive MCO dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.