Whale Analyzer
MCO Institutional Holders and 13F Ownership
Compare 22 tracked holders of MCO, their reported positions and disclosed changes. Coverage is limited to the investors tracked by Whale Analyzer; these records do not establish all shareholders or current trades. Available original SEC filings for tracked 13F holders are linked below. Top tracked holders include Berkshire Hathaway, TCI Fund Management, Egerton Capital, and Valley Forge Capital Management.
Continue to the live MCO dashboardTop holders
| Investor | Reported value | Shares | Change | Report date |
|---|---|---|---|---|
| Berkshire Hathaway 13F holdings | $11.17B | 24.7M | Held | 2026-06-30 |
| TCI Fund Management 13F holdings | $6.49B | 14.3M | Held | 2026-06-30 |
| Egerton Capital 13F holdings | $743.5M | 1.6M | Reduced | 2026-09-30 |
| Valley Forge Capital Management 13F holdings | $596.6M | 1.3M | Held | 2026-06-30 |
| Akre Capital Management 13F holdings | $524.0M | 1.2M | Reduced | 2026-06-30 |
| Baillie Gifford & Co 13F holdings | $325.1M | 717.9K | Reduced | 2026-06-30 |
| Generation Investment Management 13F holdings | $243.9M | 538.5K | Increased | 2026-06-30 |
| National Pension Service 13F holdings | $226.9M | 500.9K | Increased | 2026-06-30 |
| AKO Capital 13F holdings | $193.8M | 427.9K | Reduced | 2026-06-30 |
| Altarock Partners 13F holdings | $137.1M | 302.6K | Reduced | 2026-06-30 |
| Markel Group 13F holdings | $97.1M | 213.9K | Held | 2026-09-30 |
| Oakcliff Capital 13F holdings | $15.4M | 34.0K | New | 2026-06-30 |
Original SEC filing sources
These recorded filings support the tracked 13F rows included in the aggregate reported values on this page. See each holder profile for source coverage and context for other disclosure types.
- Berkshire Hathaway SEC filing (0001193125-26-352200) · report date 2026-06-30
- TCI Fund Management SEC filing (0001647251-26-000007) · report date 2026-06-30
- Egerton Capital SEC filing (0001581811-26-000009) · report date 2026-09-30
- Valley Forge Capital Management SEC filing (0001697868-26-000005) · report date 2026-06-30
- Akre Capital Management SEC filing (0001112520-26-000014) · report date 2026-06-30
- Baillie Gifford & Co SEC filing (0001088875-26-000057) · report date 2026-06-30
- Generation Investment Management SEC filing (0001752724-26-000044) · report date 2026-06-30
- National Pension Service SEC filing (0001193125-26-347818) · report date 2026-06-30
- AKO Capital SEC filing (0001376879-26-000006) · report date 2026-06-30
- Altarock Partners SEC filing (0001104659-26-097527) · report date 2026-06-30
- Markel Group SEC filing (0001096343-26-000085) · report date 2026-09-30
- Oakcliff Capital SEC filing (0001172661-26-003363) · report date 2026-06-30
- Bridgewater Associates SEC filing (0001350694-26-000003) · report date 2026-06-30
- Aquamarine Fund SEC filing (0001953324-26-000003) · report date 2026-06-30
- Cantillon Capital Management SEC filing (0001279936-26-000005) · report date 2026-06-30
- Yacktman Asset Management SEC filing (0000905567-26-000005) · report date 2026-09-30
- Century Management SEC filing (0001398344-26-014492) · report date 2026-06-30
- Oakmark Funds SEC filing (0000813917-26-000042) · report date 2026-06-30
- Chou Associates SEC filing (0001104659-26-094668) · report date 2026-06-30
- Dodge & Cox SEC filing (0001193125-26-349535) · report date 2026-06-30
- Capital Research Global Investors SEC filing (0001422848-26-000094) · report date 2026-06-30
- Brave Warrior Advisors SEC filing (0001172661-26-003728) · report date 2026-06-30
Tracked-sample concentration
Reported position value for MCO is highly concentrated within this tracked-holder sample. These percentages are not market-wide ownership shares.
- Largest tracked holder: 53.7% of aggregate reported value in this sample
- Top 5 tracked holders: 93.8% of aggregate reported value in this sample
- Top 10 tracked holders: 99.2% of aggregate reported value in this sample
Whale activity this quarter
Across 22 tracked holders, 10 held, 7 reduced, 5 increased. Net positioning is net selling.
- Berkshire Hathaway ($11.17B) (→ 0.0% qoq shares) · modeled avg cost estimate $131.63
- TCI Fund Management ($6.49B) (→ 0.0% qoq shares) · modeled avg cost estimate $238.43
- Egerton Capital ($743.5M) (▼ 3.9% qoq shares)
- Valley Forge Capital Management ($596.6M) (→ 0.0% qoq shares) · modeled avg cost estimate $214.86
- Akre Capital Management ($524.0M) (▼ 7.2% qoq shares)
- Baillie Gifford & Co ($325.1M) (▼ 6.1% qoq shares)
- Generation Investment Management ($243.9M) (▲ 47.0% qoq shares) · modeled avg cost estimate $435.98
- National Pension Service ($226.9M) (▲ 0.3% qoq shares) · modeled avg cost estimate $271.28
Modeled cost estimate vs current price
The share-weighted modeled cost estimate across 10 covered tracked holders is $176.54 versus a current price of $505.67, so MCO trades above that estimate (+186.4%). This model does not establish any filer's actual purchase price, unrealized gain, or investment return.
Sector positioning — Other
MCO sits within the Other sector alongside 1558 other tracked names. Compare reported positions across tracked peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time or market-wide ownership totals. Open the live MCO dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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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 22 public-disclosure holders of MCO with a combined reported value of $20.81B. See the holder table above for the largest tracked positions.
Which top funds are buying MCO?
Tracked holders were net selling last quarter — 10 held, 7 reduced, 5 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is the tracked MCO sample?
The top five tracked holders account for 93.8% of aggregate reported value in this tracked sample. This is not a market-wide ownership percentage.
How does MCO compare with the modeled cost estimate?
The share-weighted modeled cost estimate across 10 covered tracked holders is $176.54 versus a current price of $505.67 (+186.4%). It is not an actual purchase price, unrealized gain, or investment return.
What does 13F ownership mean for MCO?
These are historical reported positions from tracked filers, not real-time ownership or a complete shareholder register. Use the interactive MCO dashboard to explore them, or read our 13F Alpha Signals Guide.