As of August 29, 2026, the three largest insider holders of SGMT are Enterprise Associates 13 Lp New (TenPercentOwner, 3.85Mn shares), Enterprise Associates 13 Lp New (TenPercentOwner, 3.85Mn shares), Enterprise Associates 13 Lp New (TenPercentOwner, 3.85Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Patrick J Kerins | TenPercentOwner | 13,139 | 3,000,275 | 3,013,414 | 13.8% | 31 Jan, 2024 |
| 2 | Forest Baskett | TenPercentOwner | 0 | 3,011,575 | 3,011,575 | 13.8% | 31 Jan, 2024 |
| 3 | Scott D Sandell | TenPercentOwner | 0 | 3,007,272 | 3,007,272 | 13.8% | 31 Jan, 2024 |
| 4 | Partners 13, Limited Partnership Nea | TenPercentOwner | 0 | 3,000,275 | 3,000,275 | 13.7% | 31 Jan, 2024 |
| 5 | Enterprise Associates 13 Lp New | TenPercentOwner | 3,000,275 | 0 | 3,000,275 | 13.7% | 31 Jan, 2024 |
| 6 | Beth C Seidenberg | Director | 84,768 | 1,946,350 | 2,031,118 | 9.3% | 20 Jul, 2023 |
| 7 | Pbd Associates, Llc Kpcb | TenPercentOwner | 0 | 1,899,475 | 1,899,475 | 8.7% | 20 Jul, 2023 |
| 8 | Jinzi Jason Wu | Director | 0 | 1,654,701 | 1,654,701 | 7.6% | 20 Jul, 2023 |
| 9 | David Happel | President Ceo | 741,570 | 0 | 741,570 | 3.4% | 22 Jul, 2026 |
| 10 | Elizabeth Rozek | Chief Legal Admin. Officer | 224,414 | 0 | 224,414 | 1.0% | 22 Jul, 2026 |
| 11 | Eduardo Bruno Martins | Chief Medical Officer | 147,296 | 0 | 147,296 | 0.7% | 20 Feb, 2026 |
| 12 | George Kemble | Executive Chairman | 62,161 | 0 | 62,161 | 0.3% | 17 Aug, 2026 |
| 13 | Thierry Chauche | Chief Financial Officer | 59,688 | 0 | 59,688 | 0.3% | 20 Feb, 2026 |
| 14 | Merdad Parsey | Director | 12,794 | 0 | 12,794 | 0.1% | 20 Jul, 2023 |
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 |
|---|---|---|---|---|---|---|---|---|
| 14 Aug, 2026 | George Kemble | Director | Acquired M | 326,618 | $6.36 | $2.08Mn | 388,779 | Direct |
| 14 Aug, 2026 | George Kemble | Director | Acquired M | 24,369 | $6.36 | $154.99K | 413,148 | Direct |
| 14 Aug, 2026 | George Kemble | Director | Disposed S | 350,987 | $10.23 | $3.59Mn | 62,161 | Direct |
| 14 Aug, 2026 | George Kemble | Director | Disposed M | 326,618 | $0.00 | $0 | 31,455 | Direct |
| 14 Aug, 2026 | George Kemble | Director | Disposed M | 24,369 | $0.00 | $0 | 11,608 | Direct |
| 11 Aug, 2026 | George Kemble | Director | Acquired M | 9,751 | $6.36 | $62.02K | 71,912 | Direct |
| 11 Aug, 2026 | George Kemble | Director | Acquired M | 10,455 | $6.36 | $66.49K | 82,367 | Direct |
| 11 Aug, 2026 | George Kemble | Director | Disposed S | 20,206 | $9.95 | $201.15K | 62,161 | Direct |
| 11 Aug, 2026 | George Kemble | Director | Disposed M | 9,751 | $0.00 | $0 | 358,073 | Direct |
| 11 Aug, 2026 | George Kemble | Director | Disposed M | 10,455 | $0.00 | $0 | 35,977 | Direct |
| 20 Jul, 2026 | David Happel | President Ceo | Disposed S | 64,051 | $7.76 | $497.07K | 741,570 | Direct |
| 20 Jul, 2026 | George Kemble | Director | Disposed S | 18,844 | $7.46 | $140.53K | 62,161 | Direct |
| 20 Jul, 2026 | Elizabeth Rozek | Chief Legal Admin. Officer | Disposed S | 10,545 | $7.76 | $81.83K | 224,414 | Direct |
| 12 Jun, 2026 | Paul W. Hoelscher | Director | Acquired A | 39,567 | $0.00 | $0 | 39,567 | Direct |
| 12 Jun, 2026 | Jennifer Jarrett | Director | Acquired A | 39,567 | $0.00 | $0 | 39,567 | Direct |
| 12 Jun, 2026 | Anne M. Phillips | Director | Acquired A | 39,567 | $0.00 | $0 | 39,567 | Direct |
| 12 Jun, 2026 | Beth C Seidenberg | Director | Acquired A | 39,567 | $0.00 | $0 | 39,567 | Direct |
| 12 Jun, 2026 | Elizabeth A Grammer | Director | Acquired A | 39,567 | $0.00 | $0 | 39,567 | Direct |
| 12 Jun, 2026 | George Kemble | Director | Acquired A | 39,567 | $0.00 | $0 | 39,567 | Direct |
| 28 May, 2026 | Thierry Chauche | Chief Financial Officer | Acquired A | 50,000 | $0.00 | $0 | 50,000 | Direct |