As of August 29, 2026, the three largest insider holders of MPLT are Inc. Catalyst4, (TenPercentOwner, 25.31Mn shares), Holdings A/S Novo (TenPercentOwner, 3.69Mn shares), Christopher A. Kroeger (Chief Executive Officer, 1.27Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Inc. Catalyst4, | TenPercentOwner | 0 | 25,306,689 | 25,306,689 | 78.8% | 18 Aug, 2026 |
| 2 | Holdings A/S Novo | TenPercentOwner | 3,686,622 | 0 | 3,686,622 | 11.5% | 30 Oct, 2025 |
| 3 | Christopher A. Kroeger | Chief Executive Officer | 1,269,600 | 0 | 1,269,600 | 4.0% | 19 Aug, 2026 |
| 4 | Vishwas Setia | Chief Financial Officer | 356,256 | 0 | 356,256 | 1.1% | 06 May, 2026 |
| 5 | Robert C. Malenka | Director | 316,466 | 0 | 316,466 | 1.0% | 17 Apr, 2026 |
| 6 | Erin Pennock Foff | Chief Medical Officer | 312,261 | 0 | 312,261 | 1.0% | 19 Aug, 2026 |
| 7 | James Woodruff Lillie | Chief Scientific Officer | 210,110 | 0 | 210,110 | 0.7% | 19 Aug, 2026 |
| 8 | Anatol Kreitzer | Chief Discovery Officer | 180,926 | 0 | 180,926 | 0.6% | 19 Aug, 2026 |
| 9 | Kristopher Hanson | General Counsel | 153,553 | 0 | 153,553 | 0.5% | 19 Aug, 2026 |
| 10 | Jonathan Gillis | Cao And Interim Cfo | 152,482 | 0 | 152,482 | 0.5% | 19 Aug, 2026 |
| 11 | Maria C Walker | Director | 62,703 | 0 | 62,703 | 0.2% | 25 Jun, 2026 |
| 12 | Timothy John Garnett | Director | 53,457 | 0 | 53,457 | 0.2% | 25 Jun, 2026 |
| 13 | George Pavlov | Director | 28,932 | 0 | 28,932 | 0.1% | 25 Jun, 2026 |
| 14 | Troy Cox | Director | 0 | 15,620 | 15,620 | 0.0% | 28 Jul, 2026 |
| 15 | Nanna Liebach Luneborg | Director | 3,932 | 0 | 3,932 | 0.0% | 25 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 17 Aug, 2026 | James Woodruff Lillie | Chief Scientific Officer | Acquired A | 7,730 | $0.00 | $0 | 210,110 | Direct |
| 17 Aug, 2026 | Kristopher Hanson | General Counsel | Acquired A | 7,730 | $0.00 | $0 | 153,553 | Direct |
| 17 Aug, 2026 | Christopher A. Kroeger | Chief Executive Officer | Acquired A | 23,145 | $0.00 | $0 | 1,269,600 | Direct |
| 17 Aug, 2026 | Erin Pennock Foff | Chief Medical Officer | Acquired A | 13,360 | $0.00 | $0 | 312,261 | Direct |
| 17 Aug, 2026 | Jonathan Gillis | Cao And Interim Cfo | Acquired A | 6,020 | $0.00 | $0 | 150,260 | Direct |
| 17 Aug, 2026 | Anatol Kreitzer | Chief Discovery Officer | Acquired A | 6,020 | $0.00 | $0 | 180,926 | Direct |
| 17 Aug, 2026 | James Woodruff Lillie | Chief Scientific Officer | Acquired A | 31,395 | $0.00 | $0 | 31,395 | Direct |
| 17 Aug, 2026 | Erin Pennock Foff | Chief Medical Officer | Acquired A | 54,240 | $0.00 | $0 | 54,240 | Direct |
| 17 Aug, 2026 | Anatol Kreitzer | Chief Discovery Officer | Acquired A | 24,455 | $0.00 | $0 | 24,455 | Direct |
| 17 Aug, 2026 | Kristopher Hanson | General Counsel | Acquired A | 31,395 | $0.00 | $0 | 31,395 | Direct |
| 17 Aug, 2026 | Jonathan Gillis | Cao And Interim Cfo | Acquired A | 2,222 | $0.00 | $0 | 152,482 | Direct |
| 17 Aug, 2026 | Christopher A. Kroeger | Chief Executive Officer | Acquired A | 93,955 | $0.00 | $0 | 93,955 | Direct |
| 17 Aug, 2026 | Jonathan Gillis | Cao And Interim Cfo | Acquired A | 24,455 | $0.00 | $0 | 24,455 | Direct |
| 17 Aug, 2026 | Jonathan Gillis | Cao And Interim Cfo | Acquired A | 2,813 | $0.00 | $0 | 2,813 | Direct |
| 14 Aug, 2026 | Inc. Catalyst4, | TenPercentOwner | Acquired P | 4,400,000 | $11.38 | $50.07Mn | 25,306,689 | Indirect |
| 14 Aug, 2026 | Inc. Catalyst4, | TenPercentOwner | Acquired P | 2,928,686 | $11.38 | $33.33Mn | 2,928,686 | Indirect |
| 03 Aug, 2026 | James Woodruff Lillie | Chief Scientific Officer | Disposed S | 22,082 | $12.54 | $276.91K | 202,380 | Direct |
| 28 Jul, 2026 | Inc. Catalyst4, | TenPercentOwner | Acquired P | 141,088 | $10.74 | $1.52Mn | 19,838,552 | Indirect |
| 28 Jul, 2026 | Inc. Catalyst4, | TenPercentOwner | Acquired P | 65,137 | $11.69 | $761.39K | 19,903,689 | Indirect |
| 29 Jul, 2026 | Inc. Catalyst4, | TenPercentOwner | Acquired P | 3,000 | $12.63 | $37.89K | 19,906,689 | Indirect |