MRUS insider buying – Merus N.V.
20 insider purchases since 2016 worth $305.9M by 11 different insiders. Last 12 months: 4 purchases, $234.9M. Most recent filing: 2025-12-30.
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 12 older purchases (before the 5-year window) are listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| GENMAB A/S 10% Owner | $234.9M 4× · 2,421,216 sh | 2025-12-16 2025-12-26 | – | 0 shares as of 2025-12-30 | Sold everything |
| BIOTECHNOLOGY VALUE FUND II LP 10% Owner | $21.7M 2× · 1,546,472 sh | 2020-01-13 2020-06-01 | – | 338,404 shares as of 2020-06-03 | Holds - never sold |
| BVF Partners OS Ltd. 10% Owner | $20.9M 1× · 844,680 sh | 2021-01-21 2021-01-21 | – | 3,513,335 shares as of 2021-01-25 | Holds - never sold |
| LAMPERT MARK N 10% Owner | $11.7M 2× · 550,000 sh | 2021-03-16 2021-03-30 | – | 3,803,152 shares as of 2021-04-01 | Holds - never sold |
| Biotechnology Value Trading Fund OS LP 10% Owner | $4.5M 1× · 278,730 sh | 2020-01-16 2020-01-16 | – | 244,303 shares as of 2020-01-21 | Holds - never sold |
| BIOTECHNOLOGY VALUE FUND L P 10% Owner | $3.9M 2× · 247,254 sh | 2020-06-08 2020-12-18 | – | 2,245,067 shares as of 2020-12-22 | Holds - never sold |
| BVF I GP LLC 10% Owner | $2.3M 1× · 201,906 sh | 2020-09-03 2020-09-03 | 2× · $76.6M last 2021-10-07 | 1,578,732 shares as of 2021-10-08 | Sold part |
| BVF INC/IL 10% Owner | $2.1M 1× · 189,651 sh | 2020-09-10 2020-09-10 | – | 2,862,802 shares as of 2020-09-14 | Holds - never sold |
| BVF II GP LLC 10% Owner | $1.8M 1× · 79,500 sh | 2021-03-22 2021-03-22 | – | 435,121 shares as of 2021-03-24 | Holds - never sold |
| BVF GP HOLDINGS LLC 10% Owner | $1.7M 1× · 146,754 sh | 2020-09-15 2020-09-15 | – | 382,784 shares as of 2020-09-17 | Holds - never sold |
| Lundberg Sven Ante CEO | $460,879 4× · 25,576 sh | 2022-07-12 2022-11-03 | – | 0 shares as of 2025-12-12 | Sold everything |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2025 | 4 | $234.9M | 1 | 6 | $5.7M |
| 2024 | 0 | – | – | 5 | $5.2M |
| 2023 | 0 | – | – | 1 | $559,650 |
| 2022 | 4 | $460,879 | 1 | 1 | $1.6M |
| 2021 | 4 | $34.4M | 3 | 4 | $76.7M |
| 2020 | 8 | $36.2M | 6 | 1 | $1.0M |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2025-12-30 | GENMAB A/S | 10% Owner | 1,055,784 | $97.00 | $102.4M | +1.4% | SEC |
| 2025-12-29 | GENMAB A/S | 10% Owner | 815,444 | $97.00 | $79.1M | +1.1% | SEC |
| 2025-12-22 | GENMAB A/S | 10% Owner | 278,441 | $97.00 | $27.0M | +0.4% | SEC |
| 2025-12-18 | GENMAB A/S | 10% Owner | 271,547 | $97.00 | $26.3M | +0.4% | SEC |
| 2022-11-03 | Lundberg Sven Ante | CEO | 14,706 | $14.38 | $211,472 | +56.8% | SEC |
| 2022-08-23 | Lundberg Sven Ante | CEO | 5,826 | $22.92 | $133,532 | +29.1% | SEC |
| 2022-08-22 | Lundberg Sven Ante | CEO | 704 | $22.99 | $16,185 | +3.6% | SEC |
| 2022-07-13 | Lundberg Sven Ante | CEO | 4,340 | $22.97 | $99,690 | +28.9% | SEC |
| 2021-04-01 | LAMPERT MARK N | 10% Owner | 300,000 | $19.75 | $5.9M | +8.6% | SEC |
| 2021-03-24 | BVF II GP LLC | 10% Owner | 79,500 | $22.75 | $1.8M | +2.2% | SEC |
| 2021-03-18 | LAMPERT MARK N | 10% Owner | 250,000 | $23.00 | $5.8M | +7.5% | SEC |
| 2021-01-25 | BVF Partners OS Ltd. | 10% Owner | 844,680 | $24.75 | $20.9M | +31.7% | SEC |
| 2020-12-22 | BIOTECHNOLOGY VALUE FUND L P | 10% Owner | 160,000 | $16.05 | $2.6M | +5.5% | SEC |
| 2020-09-17 | BVF GP HOLDINGS LLC | 10% Owner | 146,754 | $11.75 | $1.7M | +5.3% | SEC |
| 2020-09-14 | BVF INC/IL | 10% Owner | 189,651 | $11.10 | $2.1M | +7.1% | SEC |
| 2020-09-08 | BVF I GP LLC | 10% Owner | 201,906 | $11.17 | $2.3M | +7.9% | SEC |
| 2020-06-10 | BIOTECHNOLOGY VALUE FUND L P | 10% Owner | 87,254 | $15.20 | $1.3M | +3.4% | SEC |
| 2020-06-03 | BIOTECHNOLOGY VALUE FUND II LP | 10% Owner | 1,462,510 | $14.00 | $20.5M | +127.4% | SEC |
| 2020-01-21 | Biotechnology Value Trading Fund OS LP | 10% Owner | 278,730 | $16.15 | $4.5M | +18.3% | SEC |
| 2020-01-15 | BIOTECHNOLOGY VALUE FUND II LP | 10% Owner | 83,962 | $14.98 | $1.3M | +5.3% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2025-12-10 | Shuman Harry | Officer | 1,700 | $96.10 | $163,370 | Sale | SEC |
| 2025-11-28 | Shuman Harry | Officer | 8,300 | $95.92 | $796,136 | Sale | SEC |
| 2025-07-18 | Silverman Peter B. | Officer | 25,000 | $60.00 | $1.5M | Sale | SEC |
| 2025-07-11 | Silverman Peter B. | Officer | 23,500 | $55.00 | $1.3M | Sale | SEC |
| 2025-06-24 | Silverman Peter B. | Officer | 34,000 | $52.76 | $1.8M | Sale | SEC |
| 2025-03-25 | Shuman Harry | Officer | 4,000 | $48.50 | $193,990 | Sale | SEC |
| 2024-08-22 | Shuman Harry | Officer | 5,000 | $54.00 | $270,000 | Sale | SEC |
| 2024-06-28 | Silverman Peter B. | Officer | 10,000 | $60.00 | $600,000 | Sale | SEC |
| 2024-06-20 | Silverman Peter B. | Officer | 62,000 | $56.52 | $3.5M | Sale | SEC |
| 2024-06-12 | Shuman Harry | Officer | 8,300 | $57.28 | $475,452 | Sale | SEC |
| 2024-06-06 | Shuman Harry | Officer | 6,000 | $52.90 | $317,370 | Sale | SEC |
| 2023-12-18 | Silverman Peter B. | Officer | 22,386 | $25.00 | $559,650 | Sale | SEC |
| 2022-03-11 | Silverman Peter B. | Officer | 60,000 | $26.95 | $1.6M | Sale | SEC |
| 2021-10-08 | BVF I GP LLC | 10% Owner | 1,132,714 | $27.56 | $31.2M | Sale | SEC |
| 2021-08-16 | de Kruif John | Officer | 2,787 | $19.34 | $53,901 | Sale | SEC |
Showing the latest 15 of 18 sales of $50,000+ since 2016.
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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