MDLN's three largest insider shareholders as of September 29, 2026 are Holdco, Inc. Mozart (TenPercentOwner, 233.52Mn shares), Group Vii S1, L.L.C. Tc (TenPercentOwner, 144.38Mn shares), Aggregator Ii Lp Mozart (TenPercentOwner, 142.92Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Holdco, Inc. Mozart | TenPercentOwner | 234,308,304 | 0 | 234,308,304 | 14.4% | 07 Aug, 2026 |
| 2 | Group Vii S1, L.L.C. Tc | TenPercentOwner | 0 | 215,303,036 | 215,303,036 | 13.2% | 22 Dec, 2025 |
| 3 | Aggregator Ii Lp Mozart | TenPercentOwner | 0 | 215,291,312 | 215,291,312 | 13.2% | 22 Dec, 2025 |
| 4 | Mozart Coinvestment Holdings, L.P. Carlyle | TenPercentOwner | 0 | 202,456,302 | 202,456,302 | 12.4% | 12 Mar, 2026 |
| 5 | Circle Ml Holdco Gp, Llc Cp | TenPercentOwner | 0 | 187,083,713 | 187,083,713 | 11.5% | 12 Mar, 2026 |
| 6 | Group Cayman Investment Holdings, L.P. Tc | TenPercentOwner | 0 | 187,083,713 | 187,083,713 | 11.5% | 12 Mar, 2026 |
| 7 | Group Inc. Carlyle | TenPercentOwner | 0 | 187,083,713 | 187,083,713 | 11.5% | 12 Mar, 2026 |
| 8 | Friedman Capital Partners X (Parallel), L.P. Hellman | TenPercentOwner | 0 | 153,327,675 | 153,327,675 | 9.4% | 01 Jun, 2026 |
| 9 | Private Ltd Gic | TenPercentOwner | 22,802,482 | 0 | 22,802,482 | 1.4% | 17 Aug, 2026 |
| 10 | 8 Holdings Mozart Manager L.L.C. Bcp | TenPercentOwner | 0 | 8,756,506 | 8,756,506 | 0.5% | 01 Jun, 2026 |
| 11 | Mozart Ml-1 Holdco L.P. Bx | TenPercentOwner | 0 | 8,257,502 | 8,257,502 | 0.5% | 26 May, 2026 |
| 12 | Charles N. Mills | Director | 0 | 2,643,315 | 2,643,315 | 0.2% | 22 Dec, 2025 |
| 13 | Andrew J. Mills | Director | 0 | 2,616,861 | 2,616,861 | 0.2% | 22 Dec, 2025 |
| 14 | Mozart Ml-2 Holdco L.P. Bx | TenPercentOwner | 0 | 1,990,467 | 1,990,467 | 0.1% | 01 Jun, 2026 |
| 15 | Patrick J Healy | Director | 1,387,921 | 172,383 | 1,560,304 | 0.1% | 01 Jun, 2026 |
| 16 | Douglas P Golwas | Chief Commercial Officer | 389,763 | 0 | 389,763 | 0.0% | 17 Jun, 2026 |
| 17 | James M Boyle | Chief Executive Officer | 29,369 | 0 | 29,369 | 0.0% | 17 Jun, 2026 |
| 18 | Amanda H. Laabs | Chief Product Officer | 23,899 | 0 | 23,899 | 0.0% | 17 Jun, 2026 |
| 19 | Stephen L Miller | Chief Operating Officer | 23,899 | 0 | 23,899 | 0.0% | 17 Jun, 2026 |
| 20 | Michael B Drazin | Chief Financial Officer | 23,899 | 0 | 23,899 | 0.0% | 17 Jun, 2026 |
| 21 | William J Abrams | Officer | 16,546 | 0 | 16,546 | 0.0% | 17 Jun, 2026 |
| 22 | Alexander M. Liberman | Chief Legal Officer | 11,031 | 0 | 11,031 | 0.0% | 17 Jun, 2026 |
| 23 | Christopher P Shryock | Chief Human Resources Officer | 11,031 | 0 | 11,031 | 0.0% | 17 Jun, 2026 |
| 24 | Jessi L Corcoran | Principal Accounting Officer | 5,000 | 0 | 5,000 | 0.0% | 09 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 |
|---|---|---|---|---|---|---|---|---|
| 19 Aug, 2026 | Stephen L Miller | Chief Operating Officer | Acquired A | 87,667 | — | — | 87,667 | Indirect |
| 19 Aug, 2026 | James M Boyle | Chief Executive Officer | Acquired A | 764,252 | — | — | 764,252 | Indirect |
| 13 Aug, 2026 | Private Ltd Gic | TenPercentOwner | Disposed S | 1,500,000 | $35.80 | $53.70Mn | 22,902,482 | Direct |
| 14 Aug, 2026 | Private Ltd Gic | TenPercentOwner | Disposed S | 100,000 | $35.80 | $3.58Mn | 22,802,482 | Direct |
| 07 Aug, 2026 | Private Ltd Gic | TenPercentOwner | Disposed S | 590,284 | $35.58 | $21.00Mn | 24,402,482 | Direct |
| 05 Aug, 2026 | Private Ltd Gic | TenPercentOwner | Disposed S | 1,710,907 | $35.46 | $60.67Mn | 25,530,471 | Direct |
| 06 Aug, 2026 | Holdco, Inc. Mozart | TenPercentOwner | Acquired C | 500,000 | $0.00 | $0 | 787,648 | Direct |
| 06 Aug, 2026 | Holdco, Inc. Mozart | TenPercentOwner | Disposed J | 500,000 | $0.00 | $0 | 233,520,656 | Direct |
| 05 Aug, 2026 | Private Ltd Gic | TenPercentOwner | Disposed S | 265,711 | $36.48 | $9.69Mn | 25,264,760 | Direct |
| 06 Aug, 2026 | Private Ltd Gic | TenPercentOwner | Disposed S | 271,994 | $35.33 | $9.61Mn | 24,992,766 | Direct |
| 06 Aug, 2026 | Holdco, Inc. Mozart | TenPercentOwner | Disposed C | 500,000 | $0.00 | $0 | 233,520,656 | Direct |
| 15 Jun, 2026 | Stephen L Miller | Chief Operating Officer | Disposed F | 1,889 | $36.61 | $69.16K | 23,899 | Direct |
| 15 Jun, 2026 | Alexander M. Liberman | Chief Legal Officer | Disposed F | 872 | $36.61 | $31.92K | 11,031 | Direct |
| 15 Jun, 2026 | William J Abrams | Officer | Disposed F | 1,308 | $36.61 | $47.89K | 16,546 | Direct |
| 15 Jun, 2026 | Michael B Drazin | Chief Financial Officer | Disposed F | 1,889 | $36.61 | $69.16K | 23,899 | Direct |
| 15 Jun, 2026 | Amanda H. Laabs | Chief Product Officer | Disposed F | 1,889 | $36.61 | $69.16K | 23,899 | Direct |
| 15 Jun, 2026 | Christopher P Shryock | Chief Human Resources Officer | Disposed F | 872 | $36.61 | $31.92K | 11,031 | Direct |
| 15 Jun, 2026 | James M Boyle | Chief Executive Officer | Disposed F | 2,370 | $36.61 | $86.77K | 29,369 | Direct |
| 15 Jun, 2026 | Douglas P Golwas | Chief Commercial Officer | Disposed F | 1,889 | $36.61 | $69.16K | 23,899 | Direct |
| 16 Jun, 2026 | Douglas P Golwas | Chief Commercial Officer | Acquired M | 100,000 | — | — | 123,899 | Direct |