Who owns NAMSW? 13F holders and whale ownership
NAMSW is tracked across public portfolios in Whale Analyzer. This page answers who owns NAMSW, which top funds are buying NAMSW, aggregate disclosed value, and recent position changes based on public data. Peter Kolchinsky is the largest reported holder at $306M; the top five funds control 100.0% of reported ownership; institutions were net buying last quarter (1 increased, 0 reduced); the stock trades above the aggregate whale cost basis of $12.61. Top tracked holders include Peter Kolchinsky, Andreas Halvorsen, Stanley Druckenmiller, and Lee Ainslie.
Continue to the live NAMSW dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Peter Kolchinsky 13F portfolio RA Capital Management holdings | $305.7M | 9.6M | Held |
| Andreas Halvorsen 13F portfolio Viking Global Investors holdings | $134.6M | 4.2M | Held |
| Stanley Druckenmiller 13F portfolio Duquesne Family Office holdings | $98.3M | 3.1M | Held |
| Lee Ainslie 13F portfolio Maverick Capital holdings | $70.0M | 2.2M | Increased |
Ownership concentration
Reported ownership of NAMSW is highly concentrated across tracked institutions.
- Single largest holder: 50.2% of reported ownership
- Top 5 holders: 100.0%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 4 tracked institutions, 3 held, 1 increased. Net positioning is net buying.
- Peter Kolchinsky — RA Capital Management ($305.7M) (▲ 2765.1% qoq shares)
- Andreas Halvorsen — Viking Global Investors ($134.6M) (→ 0.0% qoq shares)
- Stanley Druckenmiller — Duquesne Family Office ($98.3M) (→ 0.0% qoq shares) · avg cost $13.80
- Lee Ainslie — Maverick Capital ($70.0M) (▲ 15.4% qoq shares) · avg cost $10.93
Whale cost basis vs current price
The aggregate tracked cost basis is $12.61 versus a current price of $21.37, so NAMSW trades above its cost basis (+69.5%). Average unrealized P&L across tracked holders: 23%.
Sector positioning — Health Care
NAMSW 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 NAMSW dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
Related stock holder pages
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- DNTH whale holders — DIANTHUS THERAPEUTICS INC
Learn more in Whale Analyzer Academy
Deepen your read on NAMSW with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns NAMSW stock?
Whale Analyzer tracks 4 public institutional holders of NAMSW with a combined reported value of $608.5M. See the holder table above for the largest tracked positions.
Which top funds are buying NAMSW?
Tracked institutions were net buying last quarter — 3 held, 1 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is NAMSW ownership?
The top five tracked holders report 100.0% of aggregate ownership.
Is NAMSW above or below the whale cost basis?
The aggregate tracked cost basis is $12.61 versus a current price of $21.37 (+69.5%).
What does 13F ownership mean for NAMSW?
Use the interactive NAMSW dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.