Merus N.V.
Merus N.V. (MRUS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MRUS · as of Mar 31, 2025
Ownership Breakdown
194
Institutional Holders
▼ 6 vs Q4
$2.98B
Total Inst. Value
▲ $23.47M vs Q4
75.84M
Shares Outstanding
freeFloat 92.31%
70.84M
13F Shares Held
▲ 463,493 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MRUS largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC pharmaceutical preparations | 6.97M | 10.09% | 10.09% | $293.24B | May 12, 2025 | ▲ 67.4K |
WELLINGTON MANAGEMENT GROUP LLP pharmaceutical preparations | 4.72M | 6.84% | 6.84% | $198.59B | May 13, 2025 | ▲ 1.22M |
COMMODORE CAPITAL LP pharmaceutical preparations | 4.47M | 6.48% | 6.48% | $188.26B | May 15, 2025 | ▲ 598.7K |
RTW INVESTMENTS, LP pharmaceutical preparations | 4.17M | 6.04% | 6.04% | $175.49B | May 15, 2025 | — held |
PARADIGM BIOCAPITAL ADVISORS LP pharmaceutical preparations | 3.37M | 4.88% | 4.88% | $141.83B | May 15, 2025 | ▲ 1.68M |
DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) pharmaceutical preparations | 3.17M | 4.60% | 4.60% | $133.59B | May 15, 2025 | ▲ 201.1K |
AVORO CAPITAL ADVISORS LLC pharmaceutical preparations | 3.00M | 4.35% | 4.35% | $126.27B | May 15, 2025 | ▲ 875.0K |
SAMLYN CAPITAL, LLC pharmaceutical preparations | 2.38M | 3.45% | 3.45% | $100.15B | May 15, 2025 | ▼ 288.8K |
FRANKLIN RESOURCES INC pharmaceutical preparations | 1.99M | 2.89% | 2.89% | $83.81B | May 13, 2025 | ▲ 6.7K |
HOLOCENE ADVISORS, LP pharmaceutical preparations | 1.87M | 2.71% | 2.71% | $78.86B | May 15, 2025 | ▼ 6.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
28
Increased
+8.01M shares0
New Positions
first time holders17
Decreased
−3.73M shares0
Sold Out
fully exitedNet shares change (top 50)
+4.28M
+8.01M / −3.73M
Net new holders
+11
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MRUS insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
21
Buy transactions
102
Sell transactions
0.21
Buy/Sell ratio
$80M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
GENMAB A/S 10 percent owner | Dec 29, 2025 | Purchase | 1,052,806 | $97.00 | $102.12M | 73.88M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 26, 2025 | Purchase | 2,978 | $97.00 | $288.9K | 72.83M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 29, 2025 | Purchase | 75,867,199 | $97.00 | $7.36B | 0 | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 26, 2025 | Purchase | 142,610 | $97.00 | $13.83M | 72.83M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 24, 2025 | Purchase | 96,082 | $97.00 | $9.32M | 72.69M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 23, 2025 | Purchase | 561,042 | $97.00 | $54.42M | 72.59M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 22, 2025 | Purchase | 15,710 | $97.00 | $1.52M | 72.03M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 19, 2025 | Purchase | 66,264 | $97.00 | $6.43M | 72.01M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 18, 2025 | Purchase | 212,177 | $97.00 | $20.58M | 71.95M | Form 4 ↗ |
GENMAB A/S 10 percent owner | Dec 17, 2025 | Purchase | 150,795 | $97.00 | $14.63M | 71.73M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Merus N.V. (MRUS) is primarily owned by institutional investors, who hold approximately 93.4% of total shares outstanding. Company insiders own approximately 7.69%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Merus N.V. is FMR LLC, holding approximately 6.97 million shares — equal to 10.09% of outstanding shares — as of March 31, 2025.
A total of 194 institutional investors currently hold MRUS stock, with a combined institutional value of approximately $2.98 billion as of the most recent 13F filing period.
Frequently asked questions
MRUS ownershipMerus N.V. (MRUS) is primarily owned by institutional investors, who hold approximately 93.4% of shares. The largest shareholder is FMR LLC with a 10.09% stake. Company insiders hold 7.69%. Data sourced from SEC Form 13F as of March 31, 2025.