Who owns TMO? 13F holders and whale ownership
TMO is tracked across public portfolios in Whale Analyzer. This page answers who owns TMO, which top funds are buying TMO, aggregate disclosed value, and recent position changes based on public data. Capital Group is the largest reported holder at $2.08B; the top five funds control 87.9% of reported ownership; institutions were net buying last quarter (7 increased, 3 reduced); the stock trades above the aggregate whale cost basis of $388.71. Top tracked holders include Capital Group, Dodge & Cox, PRIMECAP Management, and Andreas Halvorsen.
Continue to the live TMO dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Capital Group 13F portfolio Capital Research Global Investors holdings | $2.08B | 4.1M | Reduced |
| Dodge & Cox 13F portfolio Dodge & Cox holdings | $1.53B | 3.1M | Increased |
| PRIMECAP Management 13F portfolio PRIMECAP Management Company holdings | $993.8M | 2.0M | Reduced |
| Andreas Halvorsen 13F portfolio Viking Global Investors holdings | $971.3M | 1.9M | Increased |
| NPS Korea 13F portfolio National Pension Service holdings | $422.1M | 841.9K | Increased |
| Dan Sundheim 13F portfolio D1 Capital Partners holdings | $409.7M | 817.1K | Increased |
| Baillie Gifford 13F portfolio Baillie Gifford & Co holdings | $323.7M | 645.6K | Reduced |
| Samuel Isaly 13F portfolio OrbiMed Advisors holdings | $45.5M | 90.7K | Increased |
| Tom Gayner 13F portfolio Markel Group holdings | $36.6M | 73.1K | Increased |
| Stanley Druckenmiller 13F portfolio Duquesne Family Office holdings | $9.6M | 19.2K | New |
Ownership concentration
Reported ownership of TMO is highly concentrated across tracked institutions.
- Single largest holder: 30.5% of reported ownership
- Top 5 holders: 87.9%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 10 tracked institutions, 7 increased, 3 reduced. Net positioning is net buying.
- Capital Group — Capital Research Global Investors ($2.08B) (▼ 6.0% qoq shares)
- Dodge & Cox — Dodge & Cox ($1.53B) (▲ 11767.4% qoq shares) · avg cost $434.41
- PRIMECAP Management — PRIMECAP Management Company ($993.8M) (→ 0.0% qoq shares)
- Andreas Halvorsen — Viking Global Investors ($971.3M) (▲ 16.2% qoq shares) · avg cost $313.06
- NPS Korea — National Pension Service ($422.1M) (▲ 1.5% qoq shares) · avg cost $337.40
- Dan Sundheim — D1 Capital Partners ($409.7M) (▲ 12.7% qoq shares) · avg cost $438.34
- Baillie Gifford — Baillie Gifford & Co ($323.7M) (▼ 7.6% qoq shares)
- Samuel Isaly — OrbiMed Advisors ($45.5M) (▲ 95.1% qoq shares)
Whale cost basis vs current price
The aggregate tracked cost basis is $388.71 versus a current price of $613.78, so TMO trades above its cost basis (+57.9%). Average unrealized P&L across tracked holders: 57%.
Sector positioning — Health Care
TMO sits within the Health Care sector alongside 221 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 TMO 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 TMO with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns TMO stock?
Whale Analyzer tracks 10 public institutional holders of TMO with a combined reported value of $6.82B. See the holder table above for the largest tracked positions.
Which top funds are buying TMO?
Tracked institutions were net buying last quarter — 7 increased, 3 reduced. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is TMO ownership?
The top five tracked holders report 87.9% of aggregate ownership.
Is TMO above or below the whale cost basis?
The aggregate tracked cost basis is $388.71 versus a current price of $613.78 (+57.9%).
What does 13F ownership mean for TMO?
Use the interactive TMO dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.