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. Warren Buffett is the largest reported holder at $11.17B; the top five funds control 97.5% of reported ownership; institutions were net selling last quarter (1 increased, 3 reduced); the stock trades above the aggregate whale cost basis of $175.3. Top tracked holders include Warren Buffett, Chris Hohn, Dev Kantesaria, and Chuck Akre.
Continue to the live MCO dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Warren Buffett 13F portfolio Berkshire Hathaway holdings | $11.17B | 24.7M | Held |
| Chris Hohn 13F portfolio TCI Fund Management holdings | $6.49B | 14.3M | Held |
| Dev Kantesaria 13F portfolio Valley Forge Capital Management holdings | $596.6M | 1.3M | Held |
| Chuck Akre 13F portfolio Akre Capital Management holdings | $524.0M | 1.2M | Reduced |
| Baillie Gifford 13F portfolio Baillie Gifford & Co holdings | $325.1M | 717.9K | Reduced |
| Al Gore / David Blood 13F portfolio Generation Investment Management holdings | $243.9M | 538.5K | Increased |
| Altarock Partners 13F portfolio Altarock Partners holdings | $137.1M | 302.6K | Reduced |
| Tom Gayner 13F portfolio Markel Group holdings | $96.9M | 213.9K | Held |
| Guy Spier 13F portfolio Aquamarine Fund holdings | $12.2M | 27.0K | Held |
Ownership concentration
Reported ownership of MCO is highly concentrated across tracked institutions.
- Single largest holder: 57.0% of reported ownership
- Top 5 holders: 97.5%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 9 tracked institutions, 5 held, 3 reduced, 1 increased. Net positioning is net selling.
- Warren Buffett — Berkshire Hathaway ($11.17B) (→ 0.0% qoq shares) · avg cost $131.63
- Chris Hohn — TCI Fund Management ($6.49B) (→ 0.0% qoq shares) · avg cost $238.43
- Dev Kantesaria — Valley Forge Capital Management ($596.6M) (→ 0.0% qoq shares) · avg cost $214.86
- Chuck Akre — Akre Capital Management ($524.0M) (▼ 7.2% qoq shares)
- Baillie Gifford — Baillie Gifford & Co ($325.1M) (▼ 6.1% qoq shares)
- Al Gore / David Blood — Generation Investment Management ($243.9M) (▲ 47.0% qoq shares) · avg cost $435.98
- Altarock Partners — Altarock Partners ($137.1M) (▼ 64.9% qoq shares)
- Tom Gayner — Markel Group ($96.9M) (→ 0.0% qoq shares) · avg cost $72.16
Whale cost basis vs current price
The aggregate tracked cost basis is $175.30 versus a current price of $493.55, so MCO trades above its cost basis (+181.6%). Average unrealized P&L across tracked holders: 204%.
Sector positioning — Other
MCO sits within the Other sector alongside 689 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live MCO dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
Related stock holder pages
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Learn more in Whale Analyzer Academy
Deepen your read on MCO with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns MCO stock?
Whale Analyzer tracks 9 public institutional holders of MCO with a combined reported value of $19.60B. See the holder table above for the largest tracked positions.
Which top funds are buying MCO?
Tracked institutions were net selling last quarter — 5 held, 3 reduced, 1 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is MCO ownership?
The top five tracked holders report 97.5% of aggregate ownership.
Is MCO above or below the whale cost basis?
The aggregate tracked cost basis is $175.30 versus a current price of $493.55 (+181.6%).
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.