Data spanning the past 90 days through January 09, 2026 reveals that Monte Rosa Therapeutics's three principal insider shareholders consist of TenPercentOwner Edward T Mathers (7.69Mn shares), TenPercentOwner Joshua Makower (7.69Mn shares), TenPercentOwner Peter W. Sonsini (7.69Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Joshua Makower | 7,692,298 | 30 Jun, 2021 | |
| Scott D Sandell | 7,692,298 | 30 Jun, 2021 | |
| Forest Baskett | 7,692,298 | 30 Jun, 2021 | |
| Edward T Mathers | 7,692,298 | 30 Jun, 2021 | |
| Paul Edward Walker | 7,692,298 | 30 Jun, 2021 | |
| Peter W. Sonsini | 7,692,298 | 30 Jun, 2021 | |
| Anthony A. Jr. Florence | 7,692,298 | 30 Jun, 2021 | |
| Ali Behbahani | 7,692,298 | 30 Jun, 2021 | |
| Liza Landsman | 7,692,298 | 30 Jun, 2021 | |
| Mohamad Makhzoumi | 7,692,298 | 30 Jun, 2021 | |
| Carmen Chang | 7,692,298 | 30 Jun, 2021 | |
| Enterprise Associates 17, L.P. New | 7,692,298 | 30 Jun, 2021 | |
| Rick Yang | 7,692,298 | 30 Jun, 2021 | |
| Venture Capital Vi, L.P. Versant | 5,652,922 | 30 Oct, 2024 | |
| Asset Management, Lp Cormorant | 3,202,200 | 30 Jun, 2021 | |
| Bradley J Phd Bolzon | 2,097,938 | 30 Jun, 2021 | |
| Markus Warmuth | President & Ceo | 624,403 | 05 Jan, 2026 |
| Filip Janku | Chief Medical Officer | 75,026 | 05 Jan, 2026 |
| Sharon Townson | Chief Scientific Officer | 67,845 | 05 Jan, 2026 |
| Jennifer Champoux | Chief Operating Officer | 62,371 | 05 Jan, 2026 |
| Philip Nickson | Chief Business & Legal Officer | 60,845 | 05 Jan, 2026 |
| Edmund Dunn | Principal Accounting Officer | 22,693 | 05 Jan, 2026 |
| Chandra P. Leo | 10,000 | 25 Mar, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 05 Jan, 2026 | Markus Warmuth | Common Stock | D | 10,135 | $15.17 | 624,403 | D | S |
| 05 Jan, 2026 | Sharon Townson | Common Stock | D | 3,155 | $15.17 | 67,845 | D | S |
| 05 Jan, 2026 | Filip Janku | Common Stock | D | 3,155 | $15.17 | 75,026 | D | S |
| 05 Jan, 2026 | Philip Nickson | Common Stock | D | 3,155 | $15.17 | 60,845 | D | S |
| 05 Jan, 2026 | Edmund Dunn | Common Stock | D | 1,039 | $15.17 | 22,693 | D | S |
| 05 Jan, 2026 | Jennifer Champoux | Common Stock | D | 2,629 | $15.17 | 62,371 | D | S |
| 02 Jan, 2026 | Markus Warmuth | Common Stock | A | 90,000 | - | 634,538 | D | A |
| 02 Jan, 2026 | Sharon Townson | Common Stock | A | 35,000 | - | 71,000 | D | A |
| 02 Jan, 2026 | Filip Janku | Common Stock | A | 31,000 | - | 78,181 | D | A |
| 02 Jan, 2026 | Philip Nickson | Common Stock | A | 28,000 | - | 64,000 | D | A |
| 02 Jan, 2026 | Jennifer Champoux | Common Stock | A | 35,000 | - | 65,000 | D | A |
| 03 Jun, 2025 | Edmund Dunn | Common Stock | D | 2,062 | $4.45 | 23,732 | D | S |
| 24 Mar, 2025 | Chandra P. Leo | Common Stock | A | 10,000 | $5.84 | 10,000 | D | P |
| 24 Mar, 2025 | Chandra P. Leo | - | - | 10,000 | D | |||
| 02 Jan, 2025 | Markus Warmuth | Common Stock | A | 128,000 | - | 544,538 | D | A |
| 02 Jan, 2025 | Sharon Townson | Common Stock | A | 36,000 | - | 36,000 | D | A |
| 02 Jan, 2025 | Filip Janku | Common Stock | A | 36,000 | - | 45,189 | D | A |
| 02 Jan, 2025 | Philip Nickson | Common Stock | A | 36,000 | - | 36,000 | D | A |
| 02 Jan, 2025 | Edmund Dunn | Common Stock | A | 11,850 | - | 25,794 | D | A |
| 02 Jan, 2025 | Jennifer Champoux | Common Stock | A | 30,000 | - | 30,000 | D | A |