Whale Analyzer
BSX Institutional Holders and 13F Ownership
Compare 11 tracked holders of BSX, 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 PRIMECAP Management Company, Capital Research Global Investors, Maverick Capital, and National Pension Service.
Continue to the live BSX dashboardTop holders
| Investor | Reported value | Shares | Change | Report date |
|---|---|---|---|---|
| PRIMECAP Management Company 13F holdings | $2.16B | 50.5M | Increased | 2026-06-30 |
| Capital Research Global Investors 13F holdings | $605.3M | 14.2M | Increased | 2026-06-30 |
| Maverick Capital 13F holdings | $253.4M | 5.9M | Increased | 2026-06-30 |
| National Pension Service 13F holdings | $169.0M | 4.0M | Increased | 2026-06-30 |
| OrbiMed Advisors 13F holdings | $63.3M | 1.5M | Reduced | 2026-06-30 |
| Causeway Capital Management 13F holdings | $30.7M | 720.3K | New | 2026-06-30 |
| Bridgewater Associates 13F holdings | $18.9M | 442.0K | Increased | 2026-06-30 |
| Perceptive Advisors 13F holdings | $10.7M | 250.0K | New | 2026-06-30 |
| Dodge & Cox 13F holdings | $3.7M | 87.5K | Reduced | 2026-06-30 |
| Mairs & Power Funds 13F holdings | $423.1K | 9.9K | Reduced | 2026-06-30 |
| Polen Capital Management 13F holdings | $202.7K | 4.8K | 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.
- PRIMECAP Management Company SEC filing (0000763212-26-000028) · report date 2026-06-30
- Capital Research Global Investors SEC filing (0001422848-26-000094) · report date 2026-06-30
- Maverick Capital SEC filing (0000947871-26-000793) · report date 2026-06-30
- National Pension Service SEC filing (0001193125-26-347818) · report date 2026-06-30
- OrbiMed Advisors SEC filing (0001172661-26-003740) · report date 2026-06-30
- Causeway Capital Management SEC filing (0000945621-26-001052) · report date 2026-06-30
- Bridgewater Associates SEC filing (0001350694-26-000003) · report date 2026-06-30
- Perceptive Advisors SEC filing (0001012975-26-000777) · report date 2026-06-30
- Dodge & Cox SEC filing (0001193125-26-349535) · report date 2026-06-30
- Mairs & Power Funds SEC filing (0001172661-26-003496) · report date 2026-06-30
- Polen Capital Management SEC filing (0001172661-26-003035) · report date 2026-06-30
Tracked-sample concentration
Reported position value for BSX is highly concentrated within this tracked-holder sample. These percentages are not market-wide ownership shares.
- Largest tracked holder: 65.1% of aggregate reported value in this sample
- Top 5 tracked holders: 98.0% of aggregate reported value in this sample
- Top 10 tracked holders: 100.0% of aggregate reported value in this sample
Whale activity this quarter
Across 11 tracked holders, 7 increased, 4 reduced. Net positioning is net buying.
- PRIMECAP Management Company ($2.16B) (▲ 55.3% qoq shares) · modeled avg cost estimate $16.78
- Capital Research Global Investors ($605.3M) (▲ 100.3% qoq shares) · modeled avg cost estimate $55.32
- Maverick Capital ($253.4M) (▲ 41.5% qoq shares) · modeled avg cost estimate $72.81
- National Pension Service ($169.0M) (▲ 7.1% qoq shares) · modeled avg cost estimate $42.31
- OrbiMed Advisors ($63.3M) (▼ 37.7% qoq shares)
- Bridgewater Associates ($18.9M) (▲ 474.1% qoq shares)
- Perceptive Advisors ($10.7M) · modeled avg cost estimate $57.47
- Dodge & Cox ($3.7M) (▼ 1.6% qoq shares)
Modeled cost estimate vs current price
The share-weighted modeled cost estimate across 6 covered tracked holders is $30.37 versus a current price of $42.75, so BSX trades above that estimate (+40.8%). This model does not establish any filer's actual purchase price, unrealized gain, or investment return.
Sector positioning — Health Care
BSX 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 BSX 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 BSX with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns BSX stock?
Whale Analyzer tracks 11 public-disclosure holders of BSX with a combined reported value of $3.31B. See the holder table above for the largest tracked positions.
Which top funds are buying BSX?
Tracked holders were net buying last quarter — 7 increased, 4 reduced. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is the tracked BSX sample?
The top five tracked holders account for 98.0% of aggregate reported value in this tracked sample. This is not a market-wide ownership percentage.
How does BSX compare with the modeled cost estimate?
The share-weighted modeled cost estimate across 6 covered tracked holders is $30.37 versus a current price of $42.75 (+40.8%). It is not an actual purchase price, unrealized gain, or investment return.
What does 13F ownership mean for BSX?
These are historical reported positions from tracked filers, not real-time ownership or a complete shareholder register. Use the interactive BSX dashboard to explore them, or read our 13F Alpha Signals Guide.