Whale Analyzer
TMO Institutional Holders and 13F Ownership
Compare 22 tracked holders of TMO, 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 Capital Research Global Investors, Dodge & Cox, PRIMECAP Management Company, and Viking Global Investors.
Continue to the live TMO dashboardTop holders
| Investor | Reported value | Shares | Change | Report date |
|---|---|---|---|---|
| Capital Research Global Investors 13F holdings | $2.08B | 4.1M | Reduced | 2026-06-30 |
| Dodge & Cox 13F holdings | $1.53B | 3.1M | Increased | 2026-06-30 |
| PRIMECAP Management Company 13F holdings | $993.8M | 2.0M | Reduced | 2026-06-30 |
| Viking Global Investors 13F holdings | $971.3M | 1.9M | Increased | 2026-06-30 |
| National Pension Service 13F holdings | $422.1M | 841.9K | Increased | 2026-06-30 |
| D1 Capital Partners 13F holdings | $409.7M | 817.1K | Increased | 2026-06-30 |
| Baillie Gifford & Co 13F holdings | $323.7M | 645.6K | Reduced | 2026-06-30 |
| Lindsell Train 13F holdings | $293.1M | 391.8K | Reduced | 2026-09-30 |
| Egerton Capital 13F holdings | $133.8M | 198.2K | New | 2026-09-30 |
| First Pacific Advisors 13F holdings | $124.5M | 248.2K | Increased | 2026-06-30 |
| Sound Shore 13F holdings | $82.9M | 165.3K | New | 2026-06-30 |
| Weitz Investment Management 13F holdings | $57.8M | 115.2K | Reduced | 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.
- Capital Research Global Investors SEC filing (0001422848-26-000094) · report date 2026-06-30
- Dodge & Cox SEC filing (0001193125-26-349535) · report date 2026-06-30
- PRIMECAP Management Company SEC filing (0000763212-26-000028) · report date 2026-06-30
- Viking Global Investors SEC filing (0001103804-26-000006) · report date 2026-06-30
- National Pension Service SEC filing (0001193125-26-347818) · report date 2026-06-30
- D1 Capital Partners SEC filing (0001172661-26-003662) · report date 2026-06-30
- Baillie Gifford & Co SEC filing (0001088875-26-000057) · report date 2026-06-30
- Lindsell Train SEC filing (0001172661-26-004793) · report date 2026-09-30
- Egerton Capital SEC filing (0001581811-26-000009) · report date 2026-09-30
- First Pacific Advisors SEC filing (0001377581-26-000007) · report date 2026-06-30
- Sound Shore SEC filing (0001193125-26-346754) · report date 2026-06-30
- Weitz Investment Management SEC filing (0001821268-26-000133) · report date 2026-06-30
- Markel Group SEC filing (0001096343-26-000085) · report date 2026-09-30
- OrbiMed Advisors SEC filing (0001172661-26-003740) · report date 2026-06-30
- Matrix Asset Advisors SEC filing (0001172661-26-004502) · report date 2026-09-30
- Duquesne Family Office SEC filing (0001536411-26-000006) · report date 2026-06-30
- Century Management SEC filing (0001398344-26-014492) · report date 2026-06-30
- Bridgewater Associates SEC filing (0001350694-26-000003) · report date 2026-06-30
- Mairs & Power Funds SEC filing (0001172661-26-003496) · report date 2026-06-30
- Hillman Capital Management SEC filing (0001398344-26-014467) · report date 2026-06-30
- Torray Funds SEC filing (0001193125-26-439683) · report date 2026-09-30
- Horizon Kinetics Asset Management SEC filing (0001398344-26-014047) · report date 2026-06-30
Tracked-sample concentration
Reported position value for TMO is highly concentrated within this tracked-holder sample. These percentages are not market-wide ownership shares.
- Largest tracked holder: 27.5% of aggregate reported value in this sample
- Top 5 tracked holders: 79.3% of aggregate reported value in this sample
- Top 10 tracked holders: 96.3% of aggregate reported value in this sample
Whale activity this quarter
Across 22 tracked holders, 12 increased, 7 reduced, 3 held. Net positioning is net buying.
- Capital Research Global Investors ($2.08B) (▼ 6.0% qoq shares)
- Dodge & Cox ($1.53B) (▲ 11767.4% qoq shares) · modeled avg cost estimate $434.41
- PRIMECAP Management Company ($993.8M) (→ 0.0% qoq shares)
- Viking Global Investors ($971.3M) (▲ 16.2% qoq shares) · modeled avg cost estimate $313.06
- National Pension Service ($422.1M) (▲ 1.5% qoq shares) · modeled avg cost estimate $337.40
- D1 Capital Partners ($409.7M) (▲ 12.7% qoq shares) · modeled avg cost estimate $438.34
- Baillie Gifford & Co ($323.7M) (▼ 7.6% qoq shares)
- Lindsell Train ($293.1M) (▼ 23.8% qoq shares) · modeled avg cost estimate $343.23
Modeled cost estimate vs current price
The share-weighted modeled cost estimate across 10 covered tracked holders is $387.20 versus a current price of $694.76, so TMO trades above that estimate (+79.4%). This model does not establish any filer's actual purchase price, unrealized gain, or investment return.
Sector positioning — Health Care
TMO sits within the Health Care sector alongside 253 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 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 22 public-disclosure holders of TMO with a combined reported value of $7.56B. See the holder table above for the largest tracked positions.
Which top funds are buying TMO?
Tracked holders were net buying last quarter — 12 increased, 7 reduced, 3 held. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is the tracked TMO sample?
The top five tracked holders account for 79.3% of aggregate reported value in this tracked sample. This is not a market-wide ownership percentage.
How does TMO compare with the modeled cost estimate?
The share-weighted modeled cost estimate across 10 covered tracked holders is $387.20 versus a current price of $694.76 (+79.4%). It is not an actual purchase price, unrealized gain, or investment return.
What does 13F ownership mean for TMO?
These are historical reported positions from tracked filers, not real-time ownership or a complete shareholder register. Use the interactive TMO dashboard to explore them, or read our 13F Alpha Signals Guide.