Who owns BSX? 13F holders and whale ownership
BSX is tracked across public portfolios in Whale Analyzer. This page answers who owns BSX, which top funds are buying BSX, aggregate disclosed value, and recent position changes based on public data. PRIMECAP Management is the largest reported holder at $2.04B; the top five funds control 99.8% of reported ownership; institutions were net selling last quarter (2 increased, 4 reduced); the stock trades above the aggregate whale cost basis of $28.61. Top tracked holders include PRIMECAP Management, Edgewood Management, Lee Ainslie, and Samuel Isaly.
Continue to the live BSX dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| PRIMECAP Management 13F portfolio PRIMECAP Management Company holdings | $2.04B | 32.5M | Increased |
| Edgewood Management 13F portfolio Edgewood Management LLC holdings | $478.7M | 7.6M | Reduced |
| Lee Ainslie 13F portfolio Maverick Capital holdings | $263.2M | 4.2M | Increased |
| Samuel Isaly 13F portfolio OrbiMed Advisors holdings | $149.5M | 2.4M | Reduced |
| Polen Capital 13F portfolio Polen Capital Management holdings | $36.4M | 579.7K | Reduced |
| Stephen Mandel 13F portfolio Lone Pine Capital holdings | $6.6M | 104.7K | Reduced |
Ownership concentration
Reported ownership of BSX is highly concentrated across tracked institutions.
- Single largest holder: 68.6% of reported ownership
- Top 5 holders: 99.8%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 6 tracked institutions, 4 reduced, 2 increased. Net positioning is net selling.
- PRIMECAP Management — PRIMECAP Management Company ($2.04B) (▲ 4.6% qoq shares) · avg cost $2.46
- Edgewood Management — Edgewood Management LLC ($478.7M) (▼ 2.2% qoq shares) · avg cost $101.72
- Lee Ainslie — Maverick Capital ($263.2M) (▲ 42.5% qoq shares) · avg cost $85.32
- Samuel Isaly — OrbiMed Advisors ($149.5M) (▼ 1.5% qoq shares)
- Polen Capital — Polen Capital Management ($36.4M) (▼ 85.6% qoq shares) · avg cost $111.20
- Stephen Mandel — Lone Pine Capital ($6.6M) (▼ 48.1% qoq shares) · avg cost $97.04
Whale cost basis vs current price
The aggregate tracked cost basis is $28.61 versus a current price of $44.23, so BSX trades above its cost basis (+54.6%). Average unrealized P&L across tracked holders: 408%.
Sector positioning — Health Care
BSX 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 BSX dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
Related stock holder pages
- LLY whale holders — ELI LILLY & CO
- MU whale holders — MICRON TECHNOLOGY INC
- GOOGL whale holders — ALPHABET INC
- AZN whale holders — ASTRAZENECA PLC
- KLAC whale holders — KLA CORP
- INTC whale holders — INTEL CORP
- AMGN whale holders — AMGEN INC
- NVDA whale holders — NVIDIA CORPORATION
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 6 public institutional holders of BSX with a combined reported value of $2.98B. See the holder table above for the largest tracked positions.
Which top funds are buying BSX?
Tracked institutions were net selling last quarter — 4 reduced, 2 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is BSX ownership?
The top five tracked holders report 99.8% of aggregate ownership.
Is BSX above or below the whale cost basis?
The aggregate tracked cost basis is $28.61 versus a current price of $44.23 (+54.6%).
What does 13F ownership mean for BSX?
Use the interactive BSX dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.